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Host protein

6-Phospho-gluconolactonase (6-PGLac) A2A adenosine receptor Adipocyte lipid binding protein (ALBP) Antibody Antibody 03-1 Antibody 12E11G Antibody 13G10 Antibody 13G10 / 14H7 Antibody 14H7 Antibody 1G8 Antibody 28F11 Antibody 38C2 Antibody 3A3 Antibody 7A3 Antibody7G12-A10-G1-A12 Antibody L-chain from Mab13-1 hybridoma cells Antibody SN37.4 Apo-[Fe]-hydrogenase from M. jannaschii Apo-ferritin Apo-HydA1 ([FeFe]-hydrogenase) from C. reinhardtii Apo-HydA enzymes from C. reinhardtii, M. elsdenii, C. pasteurianum Artificial construct Avidin (Av) Azurin Binding domain of Rabenosyn (Rab4) Bovine carbonic anhydrase (CA) Bovine carbonic anhydrase II (CA) Bovine serum albumin (BSA) Bovine β-lactoglobulin (βLG) Bromelain Burkavidin C45 (c-type cytochrome maquette) Carbonic anhydrase (CA) Carboxypeptidase A Catabolite activator protein (CAP) CeuE C-terminal domain of calmodulin Cutinase Cytochrome b562 Cytochrome BM3h Cytochrome c Cytochrome c552 Cytochrome cb562 Cytochrome c peroxidase Cytochrome P450 (CYP119) Domain of Hin recombinase Due Ferro 1 E. coli catabolite gene activator protein (CAP) [FeFe]-hydrogenase from C. pasteurianum (CpI) Ferredoxin (Fd) Ferritin FhuA FhuA ΔCVFtev Flavodoxin (Fld) Glyoxalase II (Human) (gp27-gp5)3 gp45 [(gp5βf)3]2 Heme oxygenase (HO) Hemoglobin Horse heart cytochrome c Horseradish peroxidase (HRP) Human carbonic anhydrase Human carbonic anhydrase II (hCAII) Human retinoid-X-receptor (hRXRa) Human serum albumin (HSA) HydA1 ([FeFe]-hydrogenase) from C. reinhardtii IgG 84A3 Laccase Lipase B from C. antarctica (CALB) Lipase from G. thermocatenulatus (GTL) LmrR Lysozyme Lysozyme (crystal) Mimochrome Fe(III)-S6G(D)-MC6 (De novo designed peptide) Mouse adenosine deaminase Myoglobin (Mb) Neocarzinostatin (variant 3.24) NikA Nitrobindin (Nb) Nitrobindin variant NB4 Nuclease from S. aureus Papain (PAP) Photoactive Yellow Protein (PYP) Photosystem I (PSI) Phytase Prolyl oligopeptidase (POP) Prolyl oligopeptidase (POP) from P. furiosus Rabbit serum albumin (RSA) Ribonuclease S RNase A Rubredoxin (Rd) Silk fibroin fibre Small heat shock protein from M. jannaschii ß-lactoglobulin Staphylococcal nuclease Steroid Carrier Protein 2L (SCP 2L) Sterol Carrier Protein (SCP) Streptavidin (monmeric) Streptavidin (Sav) Thermolysin Thermosome (THS) tHisF TM1459 cupin TRI peptide Trypsin Tryptophan gene repressor (trp) Xylanase A (XynA) Zn8:AB54 Zn8:AB54 (mutant C96T) α3D peptide α-chymotrypsin β-lactamase β-lactoglobulin (βLG)

Corresponding author

Akabori, S. Alberto, R. Albrecht, M. Anderson, J. L. R. Apfel, U.-P. Arnold, F. H. Artero, V. Bäckvall, J. E. Baker, D. Ball, Z. T. Banse, F. Berggren, G. Bian, H.-D. Birnbaum, E. R. Borovik, A. S. Bren, K. L. Bruns, N. Brustad, E. M. Cardona, F. Case, M. A. Cavazza, C. Chan, A. S. C. Coleman, J. E. Craik, C. S. Creus, M. Cuatrecasas, P. Darnall, D. W. DeGrado, W. F. Dervan, P. B. de Vries, J. Diéguez, M. Distefano, M. D. Don Tilley, T. Duhme-Klair, A. K. Ebright, R. H. Emerson, J. P. Eppinger, J. Fasan, R. Filice, M. Fontecave, M. Fontecilla-Camps, J. C. Fruk, L. Fujieda, N. Fussenegger, M. Gademann, K. Gaggero, N. Germanas, J. P. Ghattas, W. Ghirlanda, G. Golinelli-Pimpaneau, B. Goti, A. Gras, E. Gray, H. B. Green, A. P. Gross, Z. Gunasekeram, A. Happe, T. Harada, A. Hartwig, J. F. Hasegawa, J.-Y. Hayashi, T Hemschemeier, A. Herrick, R. S. Hilvert, D. Hirota, S. Huang, F.-P. Hureau, C. Hu, X. Hyster, T. K. Imanaka, T. Imperiali, B. Itoh, S. Janda, K. D. Jarvis, A. G. Jaussi, R. Jeschek, M. Kaiser, E. T. Kamer, P. C. J. Kazlauskas, R. J. Keinan, E. Khare, S. D. Kim, H. S. Kitagawa, S. Klein Gebbink, R. J. M. Kokubo, T. Korendovych, I. V. Kuhlman, B. Kurisu, G. Laan, W. Lee, S.-Y. Lehnert, N. Leow, T. C. Lerner, R. A. Lewis, J. C. Liang, H. Lindblad, P. Lin, Y.-W. Liu, J. Lombardi, A. Lubitz, W. Lu, Y. Maglio, O. Mahy, J.-P. Mangiatordi, G. F. Marchetti, M. Maréchal, J.-D. Marino, T. Marshall, N. M. Matile, S. Matsuo, T. McNaughton, B. R. Ménage, S. Messori, L. Mulfort, K. L. Nastri, F. Nicholas, K. M. Niemeyer, C. M. Nolte, R. J. M. Novič, M. Okamoto, Y. Okano, M. Okuda, J. Onoda, A. Oohora, K. Palomo, J. M. Pàmies, O. Panke, S. Pan, Y. Paradisi, F. Pecoraro, V. L. Pordea, A. Reetz, M. T. Reijerse, E. Renaud, J.-L. Ricoux, R. Rimoldi, I. Roelfes, G. Rovis, T. Sakurai, S. Salmain, M. Sasaki, T. Sauer, D. F. Schultz, P. G. Schwaneberg, U. Seelig, B. Shafaat, H. S. Shahgaldian, P. Sheldon, R. A. Shima, S. Sigman, D. S. Song, W. J. Soumillion, P. Strater, N. Sugiura, Y. Szostak, J. W. Tezcan, F. A. Thorimbert, S. Tiede, D. M. Tiller, J. C. Turner, N. J. Ueno, T. Utschig, L. M. van Koten, G. Wang, J. Ward, T. R. Watanabe, Y. Whitesides, G. M. Wilson, K. S. Woolfson, D. N. Yilmaz, F. Zhang, J.-L.

Journal

3 Biotech Acc. Chem. Res. ACS Catal. ACS Cent. Sci. ACS Sustainable Chem. Eng. Adv. Synth. Catal. Angew. Chem., Int. Ed. Appl. Biochem. Biotechnol. Appl. Organomet. Chem. Artificial Metalloenzymes and MetalloDNAzymes in Catalysis: From Design to Applications Beilstein J. Org. Chem. Biochemistry Biochim. Biophys. Acta, Bioenerg. Biochimie Bioconjug. Chem. Bioorg. Med. Chem. Bioorg. Med. Chem. Lett. Bioorganometallic Chemistry: Applications in Drug Discovery, Biocatalysis, and Imaging Biopolymers Biotechnol. Adv. Biotechnol. Bioeng. Can. J. Chem. Catal. Lett. Catal. Sci. Technol. Cat. Sci. Technol. ChemBioChem ChemCatChem Chem. Commun. Chem. Rev. Chem. Sci. Chem. Soc. Rev. Chem. - Eur. J. Chem. - Asian J. Chem. Lett. ChemistryOpen ChemPlusChem Chimia Commun. Chem. Comprehensive Inorganic Chemistry II Comprehensive Supramolecular Chemistry II C. R. Chim. Coordination Chemistry in Protein Cages: Principles, Design, and Applications Coord. Chem. Rev. Croat. Chem. Acta Curr. Opin. Biotechnol. Curr. Opin. Chem. Biol. Curr. Opin. Struct. Biol. Dalton Trans. Effects of Nanoconfinement on Catalysis Energy Environ. Sci. Eur. J. Biochem. Eur. J. Inorg. Chem. FEBS Lett. Helv. Chim. Acta Inorg. Chim. Acta Inorg. Chem. Int. J. Mol. Sci. Isr. J. Chem. J. Biol. Chem. J. Biol. Inorg. Chem. J. Immunol. Methods J. Inorg. Biochem. J. Mol. Catal. A: Chem. J. Mol. Catal. B: Enzym. J. Organomet. Chem. J. Phys. Chem. Lett. J. Porphyr. Phthalocyanines J. Protein Chem. J. Am. Chem. Soc. J. Chem. Soc. J. Chem. Soc., Chem. Commun. Methods Enzymol. Mol. Divers. Molecular Encapsulation: Organic Reactions in Constrained Systems Nature Nat. Catal. Nat. Chem. Biol. Nat. Chem. Nat. Commun. Nat. Protoc. Nat. Rev. Chem. New J. Chem. Org. Biomol. Chem. Plos ONE Proc. Natl. Acad. Sci. U. S. A. Process Biochem. Prog. Inorg. Chem. Prot. Eng. Protein Engineering Handbook Protein Expression Purif. Pure Appl. Chem. RSC Adv. Science Small Synlett Tetrahedron Tetrahedron: Asymmetry Tetrahedron Lett. Chem. Rec. Top. Catal. Top. Organomet. Chem. Trends Biotechnol.

8-Amino-5,6,7,8-tetrahydroquinoline in Iridium(III) Biotinylated Cp* Complex as Artificial Imine Reductase

Diamine ligands I–IV coordinated to an iridium metal complex with the biotin moiety anchored to the Cp* ring were investigated. This strategy, in contrast to the traditional biotin–streptavidin technology that uses a biotinylated ligand in the artificial imine reductase, is practical for envisaging how the enantiodiscrimination by different Streptavidin (Sav) mutants could influence the chiral environment of the metal cofactor. Only in the case of (R)-CAMPY IV did the chirality at the metal centre and the second coordination sphere environment, which was dictated by the host protein, operate in a synergistic way, producing better enantioselectivity at a S112M Sav catalyst/catalyst ratio of 1.0 : 2.5. Under these optimized conditions, the artificial imine reductase afforded a good enantiomeric excess (83%) in the asymmetric transfer hydrogenation of 6,7-dimethoxy-1-methyl-3,4-dihydroisoquinoline.

Metal:

Ir

Ligand type:

Cp*; Diamine

Host protein:

Streptavidin (Sav)

Anchoring strategy:

Supramolecular

Optimization:

Chemical & genetic

Max TON:

32

ee:

83

PDB:

---

Notes:

---

Metal:

Ir

Ligand type:

Cp*; Diamine

Host protein:

Streptavidin (Sav)

Anchoring strategy:

Supramolecular

Optimization:

Chemical & genetic

Max TON:

99

ee:

13

PDB:

---

Notes:

---

Abiological Catalysis by Artificial Haem Proteins Containing Noble Metals in Place of Iron

Enzymes that contain metal ions—that is, metalloenzymes—possess the reactivity of a transition metal centre and the potential of molecular evolution to modulate the reactivity and substrate-selectivity of the system1. By exploiting substrate promiscuity and protein engineering, the scope of reactions catalysed by native metalloenzymes has been expanded recently to include abiological transformations2,3. However, this strategy is limited by the inherent reactivity of metal centres in native metalloenzymes. To overcome this limitation, artificial metalloproteins have been created by incorporating complete, noble-metal complexes within proteins lacking native metal sites1,4,5. The interactions of the substrate with the protein in these systems are, however, distinct from those with the native protein because the metal complex occupies the substrate binding site. At the intersection of these approaches lies a third strategy, in which the native metal of a metalloenzyme is replaced with an abiological metal with reactivity different from that of the metal in a native protein6,7,8. This strategy could create artificial enzymes for abiological catalysis within the natural substrate binding site of an enzyme that can be subjected to directed evolution. Here we report the formal replacement of iron in Fe-porphyrin IX (Fe-PIX) proteins with abiological, noble metals to create enzymes that catalyse reactions not catalysed by native Fe-enzymes or other metalloenzymes9,10. In particular, we prepared modified myoglobins containing an Ir(Me) site that catalyse the functionalization of C–H bonds to form C–C bonds by carbene insertion and add carbenes to both β-substituted vinylarenes and unactivated aliphatic α-olefins. We conducted directed evolution of the Ir(Me)-myoglobin and generated mutants that form either enantiomer of the products of C–H insertion and catalyse the enantio- and diastereoselective cyclopropanation of unactivated olefins. The presented method of preparing artificial haem proteins containing abiological metal porphyrins sets the stage for the generation of artificial enzymes from innumerable combinations of PIX-protein scaffolds and unnatural metal cofactors to catalyse a wide range of abiological transformations.

Metal:

Ir

Ligand type:

Methyl; Porphyrin

Host protein:

Myoglobin (Mb)

Anchoring strategy:

Metal substitution

Optimization:

Chemical & genetic

Reaction:

C-H activation

Max TON:

7260

ee:

68

PDB:

---

Notes:

---

Metal:

Ir

Ligand type:

Methyl; Porphyrin

Host protein:

Myoglobin (Mb)

Anchoring strategy:

Metal substitution

Optimization:

Chemical & genetic

Reaction:

C-H activation

Max TON:

92

ee:

84

PDB:

---

Notes:

---

A Cell-Penetrating Artificial Metalloenzyme Regulates a Gene Switch in a Designer Mammalian Cell

Complementing enzymes in their native environment with either homogeneous or heterogeneous catalysts is challenging due to the sea of functionalities present within a cell. To supplement these efforts, artificial metalloenzymes are drawing attention as they combine attractive features of both homogeneous catalysts and enzymes. Herein we show that such hybrid catalysts consisting of a metal cofactor, a cell-penetrating module, and a protein scaffold are taken up into HEK-293T cells where they catalyze the uncaging of a hormone. This bioorthogonal reaction causes the upregulation of a gene circuit, which in turn leads to the expression of a nanoluc-luciferase. Relying on the biotin–streptavidin technology, variation of the biotinylated ruthenium complex: the biotinylated cell-penetrating poly(disulfide) ratio can be combined with point mutations on streptavidin to optimize the catalytic uncaging of an allyl-carbamate-protected thyroid hormone triiodothyronine. These results demonstrate that artificial metalloenzymes offer highly modular tools to perform bioorthogonal catalysis in live HEK cells.

Metal:

Ru

Ligand type:

Cp; Quinoline

Host protein:

Streptavidin (Sav)

Anchoring strategy:

Supramolecular

Optimization:

Genetic

Reaction:

Deallylation

Max TON:

33

ee:

---

PDB:

---

Notes:

---

A Chaperonin as Protein Nanoreactor for Atom-Transfer Radical Polymerization

The group II chaperonin thermosome (THS) from the archaea Thermoplasma acidophilum is reported as nanoreactor for atom‐transfer radical polymerization (ATRP). A copper catalyst was entrapped into the THS to confine the polymerization into this protein cage. THS possesses pores that are wide enough to release polymers into solution. The nanoreactor favorably influenced the polymerization of N‐isopropyl acrylamide and poly(ethylene glycol)methylether acrylate. Narrowly dispersed polymers with polydispersity indices (PDIs) down to 1.06 were obtained in the protein nanoreactor, while control reactions with a globular protein–catalyst conjugate only yielded polymers with PDIs above 1.84.

Metal:

Cu

Host protein:

Thermosome (THS)

Anchoring strategy:

Covalent

Optimization:

---

Reaction:

Polymerization

Max TON:

---

ee:

---

PDB:

---

Notes:

Non-ROMP

Achiral Cyclopentadienone Iron Tricarbonyl Complexes Embedded in Streptavidin: An Access to Artificial Iron Hydrogenases and Application in Asymmetric Hydrogenation

We report on the synthesis of biotinylated (cyclopentadienone)iron tricarbonyl complexes, the in situ generation of the corresponding streptavidin conjugates and their application in asymmetric hydrogenation of imines and ketones.

Metal:

Fe

Ligand type:

CO; Cyclopentadienone

Host protein:

Streptavidin (Sav)

Anchoring strategy:

Supramolecular

Optimization:

Chemical

Reaction:

Hydrogenation

Max TON:

20

ee:

34

PDB:

---

Notes:

---

A Clamp-Like Biohybrid Catalyst for DNA Oxidation

In processive catalysis, a catalyst binds to a substrate and remains bound as it performs several consecutive reactions, as exemplified by DNA polymerases. Processivity is essential in nature and is often mediated by a clamp-like structure that physically tethers the catalyst to its (polymeric) template. In the case of the bacteriophage T4 replisome, a dedicated clamp protein acts as a processivity mediator by encircling DNA and subsequently recruiting its polymerase. Here we use this DNA-binding protein to construct a biohybrid catalyst. Conjugation of the clamp protein to a chemical catalyst with sequence-specific oxidation behaviour formed a catalytic clamp that can be loaded onto a DNA plasmid. The catalytic activity of the biohybrid catalyst was visualized using a procedure based on an atomic force microscopy method that detects and spatially locates oxidized sites in DNA. Varying the experimental conditions enabled switching between processive and distributive catalysis and influencing the sliding direction of this rotaxane-like catalyst.

Metal:

Mn

Ligand type:

Porphyrin

Host protein:

gp45

Anchoring strategy:

Covalent

Optimization:

---

Max TON:

---

ee:

---

PDB:

1CZD

Notes:

---

A Cofactor Approach to Copper-Dependent Catalytic Antibodies

A strategy for the preparation of semisynthetic copper(II)-based catalytic metalloproteins is described in which a metal-binding bis-imidazole cofactor is incorporated into the combining site of the aldolase antibody 38C2. Antibody 38C2 features a large hydrophobic-combining site pocket with a highly nucleophilic lysine residue, LysH93, that can be covalently modified. A comparison of several lactone and anhydride reagents shows that the latter are the most effective and general derivatizing agents for the 38C2 Lys residue. A bis-imidazole anhydride (5) was efficiently prepared from N-methyl imidazole. The 38C2–5-Cu conjugate was prepared by either (i) initial derivatization of 38C2 with 5 followed by metallation with CuCl2, or (ii) precoordination of 5 with CuCl2 followed by conjugation with 38C2. The resulting 38C2–5-Cu conjugate was an active catalyst for the hydrolysis of the coordinating picolinate ester 11, following Michaelis–Menten kinetics [kcat(11) = 2.3 min−1 and Km(11) 2.2 mM] with a rate enhancement [kcat(11)kuncat(11)] of 2.1 × 105. Comparison of the second-order rate constants of the modified 38C2 and the Cu(II)-bis-imidazolyl complex k(6-CuCl2) gives a rate enhancement of 3.5 × 104 in favor of the antibody complex with an effective molarity of 76.7 M, revealing a significant catalytic benefit to the binding of the bis-imidazolyl ligand into 38C2.

Metal:

Cu

Ligand type:

Bisimidazol

Host protein:

Antibody 38C2

Anchoring strategy:

Covalent

Optimization:

Genetic

Max TON:

---

ee:

---

PDB:

---

Notes:

---

Active Site Topology of Artificial Peroxidase-like Hemoproteins Based on Antibodies Constructed from a Specifically Designed Ortho-carboxy-substituted Tetraarylporphyrin

The topology of the binding site has been studied for two monoclonal antibodies 13G10 and 14H7, elicited against iron(III)‐α,α,α,β‐meso‐tetrakis(ortho‐carboxyphenyl)porphyrin {α,α,α,β‐Fe[(o‐COOHPh)4‐porphyrin]}, and which exhibit in the presence of this α,α,α,β‐Fe[(o‐COOHPh)4‐porphyrin] cofactor a peroxidase activity. A comparison of the dissociation constants of the complexes of 13G10 and 14H7 with various tetra‐aryl‐substituted porphyrin has shown that : (a) the central iron(III) atom of α,α,α,β‐Fe[(o‐COOHPh)4‐porphyrin] is not recognized by either of the two antibodies; and (b) the ortho‐carboxylate substituents of the meso‐phenyl rings of α,α,α,β‐Fe[(o‐COOHPh)4‐porphyrin] are essential for the recognition of the porphyrin by 13G10 and 14H7. Measurement of the dissociation constants for the complexes of 13G10 and 14H7 with the four atropoisomers of (o‐COOHPh)4‐porphyrinH2 as well as mono‐ and di‐ortho‐carboxyphenyl‐substituted porphyrins suggests that the three carboxylates in the α, α, β position are recognized by both 13G10 and 14H7 with the two in the α, β positions more strongly bound to the antibody protein. Accordingly, the topology of the active site of 13G10 and 14H7 has roughly two‐thirds of the α,α,α,β‐Fe[(o‐COOHPh)4‐porphyrin] cofactor inserted into the binding site of the antibodies, with one of the aryl ring remaining outside. Three of the carboxylates are bound to the protein but no amino acid residue acts as an axial ligand to the iron atom. Chemical modification of lysine, histidine, tryptophan and arginine residues has shown that only modification of arginine residues causes a decrease in both the binding of α,α,α,β‐Fe[(o‐COOHPh)4‐porphyrin] and the peroxidase activity of both antibodies. Consequently, at least one of the carboxylates of the hapten is bound to an arginine residue and no amino acids such as lysine, histidine or tryptophan participate in the catalysis of the heterolytic cleavage of the O‐O bond of H2O2. In addition, the amino acid sequence of both antibodies not only reveals the presence of arginine residues, which could be those involved in the binding of the carboxylates of the hapten, but also the presence of several amino acids in the complementary determining regions which could bind other carboxylates through a network of H bonds.

Metal:

Fe

Ligand type:

---

Host protein:

Antibody 13G10 / 14H7

Anchoring strategy:

Antibody

Optimization:

Chemical & genetic

Reaction:

Peroxidation

Max TON:

---

ee:

---

PDB:

---

Notes:

---

Addressable DNA–Myoglobin Photocatalysis

A hybrid myoglobin, containing a single‐stranded DNA anchor and a redox‐active ruthenium moiety tethered to the heme center can be used as a photocatalyst. The catalyst can be selectively immobilized on a surface‐bound complementary DNA molecule and thus readily recycled from complex reaction mixtures. This principle may be applied to a range of heme‐dependent enzymes allowing the generation of novel light‐triggered photocatalysts. Photoactivatable myoglobin containing a DNA oligonucleotide as a structural anchor was designed by using the reconstitution of artificial heme moieties containing Ru3+ ions. This semisynthetic DNA–enzyme conjugate was successfully used for the oxidation of peroxidase substrates by using visible light instead of H2O2 for the activation. The DNA anchor was utilized for the immobilization of the enzyme on the surface of magnetic microbeads. Enzyme activity measurements not only indicated undisturbed biofunctionality of the tethered DNA but also enabled magnetic separation‐based enrichment and recycling of the photoactivatable biocatalyst.

Metal:

Ru

Ligand type:

Bipyridine

Host protein:

Myoglobin (Mb)

Anchoring strategy:

Supramolecular

Optimization:

---

Reaction:

Photooxidation

Max TON:

---

ee:

---

PDB:

---

Notes:

Horse heart myoglobin

A De Novo Designed Metalloenzyme for the Hydration of CO2

Protein design will ultimately allow for the creation of artificial enzymes with novel functions and unprecedented stability. To test our current mastery of nature’s approach to catalysis, a ZnII metalloenzyme was prepared using de novo design. α3DH3 folds into a stable single‐stranded three‐helix bundle and binds ZnII with high affinity using His3O coordination. The resulting metalloenzyme catalyzes the hydration of CO2 better than any small molecule model of carbonic anhydrase and with an efficiency within 1400‐fold of the fastest carbonic anhydrase isoform, CAII, and 11‐fold of CAIII.

Metal:

Zn

Ligand type:

Amino acid

Host protein:

α3D peptide

Anchoring strategy:

Dative

Optimization:

Chemical & genetic

Max TON:

---

ee:

---

PDB:

---

Notes:

kcat/KM ≈ 3.8*104 M-1*s-1

A Designed Functional Metalloenzyme that Reduces O2 to H2O with Over One Thousand Turnovers

Rational design of functional enzymes with a high number of turnovers is a challenge, especially those with a complex active site, such as respiratory oxidases. Introducing two His and one Tyr residues into myoglobin resulted in enzymes that reduce O2 to H2O with more than 1000 turnovers (red line, see scheme) and minimal release of reactive oxygen species. The positioning of the Tyr residue is critical for activity.

Metal:

Cu

Ligand type:

Amino acid

Host protein:

Myoglobin (Mb)

Anchoring strategy:

Dative

Optimization:

Chemical & genetic

Max TON:

1056

ee:

---

PDB:

4FWX

Notes:

Sperm whale myoglobin

A Designed Heme-[4Fe-4S] Metalloenzyme Catalyzes Sulfite Reduction like the Native Enzyme

Multielectron redox reactions often require multicofactor metalloenzymes to facilitate coupled electron and proton movement, but it is challenging to design artificial enzymes to catalyze these important reactions, owing to their structural and functional complexity. We report a designed heteronuclear heme-[4Fe-4S] cofactor in cytochrome c peroxidase as a structural and functional model of the enzyme sulfite reductase. The initial model exhibits spectroscopic and ligand-binding properties of the native enzyme, and sulfite reduction activity was improved—through rational tuning of the secondary sphere interactions around the [4Fe-4S] and the substrate-binding sites—to be close to that of the native enzyme. By offering insight into the requirements for a demanding six-electron, seven-proton reaction that has so far eluded synthetic catalysts, this study provides strategies for designing highly functional multicofactor artificial enzymes.

Metal:

Fe

Host protein:

Cytochrome c peroxidase

Anchoring strategy:

Dative

Optimization:

Chemical & genetic

Reaction:

Sulfite reduction

Max TON:

---

ee:

---

PDB:

---

Notes:

Designed heteronuclear heme-[4Fe-4S] cofactor in cytochrome c peroxidase

A Designed Metalloenzyme Achieving the Catalytic Rate of a Native Enzyme

Terminal oxidases catalyze four-electron reduction of oxygen to water, and the energy harvested is utilized to drive the synthesis of adenosine triphosphate. While much effort has been made to design a catalyst mimicking the function of terminal oxidases, most biomimetic catalysts have much lower activity than native oxidases. Herein we report a designed oxidase in myoglobin with an O2 reduction rate (52 s–1) comparable to that of a native cytochrome (cyt) cbb3 oxidase (50 s–1) under identical conditions. We achieved this goal by engineering more favorable electrostatic interactions between a functional oxidase model designed in sperm whale myoglobin and its native redox partner, cyt b5, resulting in a 400-fold electron transfer (ET) rate enhancement. Achieving high activity equivalent to that of native enzymes in a designed metalloenzyme offers deeper insight into the roles of tunable processes such as ET in oxidase activity and enzymatic function and may extend into applications such as more efficient oxygen reduction reaction catalysts for biofuel cells.

Metal:

Cu

Ligand type:

Amino acid

Host protein:

Myoglobin (Mb)

Anchoring strategy:

Dative

Optimization:

Genetic

Reaction:

O2 reduction

Max TON:

---

ee:

---

PDB:

---

Notes:

O2 reduction rates of 52 s-1 were achieved in combination with the native redox partner cyt b5.

A Designed Supramolecular Protein Assembly with In Vivo Enzymatic Activity

The generation of new enzymatic activities has mainly relied on repurposing the interiors of preexisting protein folds because of the challenge in designing functional, three-dimensional protein structures from first principles. Here we report an artificial metallo-β-lactamase, constructed via the self-assembly of a structurally and functionally unrelated, monomeric redox protein into a tetrameric assembly that possesses catalytic zinc sites in its interfaces. The designed metallo-β-lactamase is functional in the Escherichia coli periplasm and enables the bacteria to survive treatment with ampicillin. In vivo screening of libraries has yielded a variant that displays a catalytic proficiency [(kcat/Km)/kuncat] for ampicillin hydrolysis of 2.3 × 106 and features the emergence of a highly mobile loop near the active site, a key component of natural β-lactamases to enable substrate interactions.

Metal:

Zn

Ligand type:

Amino acid

Host protein:

Cytochrome cb562

Anchoring strategy:

Dative

Optimization:

Genetic

Max TON:

---

ee:

---

PDB:

4U9E

Notes:

---

A Dual Anchoring Strategy for the Localization and Activation of Artificial Metalloenzymes Based on the Biotin−Streptavidin Technology

Artificial metalloenzymes result from anchoring an active catalyst within a protein environment. Toward this goal, various localization strategies have been pursued: covalent, supramolecular, or dative anchoring. Herein we show that introduction of a suitably positioned histidine residue contributes to firmly anchor, via a dative bond, a biotinylated rhodium piano stool complex within streptavidin. The in silico design of the artificial metalloenzyme was confirmed by X-ray crystallography. The resulting artificial metalloenzyme displays significantly improved catalytic performance, both in terms of activity and selectivity in the transfer hydrogenation of imines. Depending on the position of the histidine residue, both enantiomers of the salsolidine product can be obtained.

Metal:

Ir

Ligand type:

Amino acid; Cp*

Host protein:

Streptavidin (Sav)

Anchoring strategy:

Supramolecular

Optimization:

Genetic

Max TON:

14

ee:

11

PDB:

---

Notes:

---

Metal:

Rh

Ligand type:

Amino acid; Cp*

Host protein:

Streptavidin (Sav)

Anchoring strategy:

Supramolecular

Optimization:

Genetic

Max TON:

100

ee:

79

PDB:

---

Notes:

---

A General Method for Artificial Metalloenzyme Formationthrough Strain-Promoted Azide–Alkyne Cycloaddition

Strain‐promoted azide–alkyne cycloaddition (SPAAC) can be used to generate artificial metalloenzymes (ArMs) from scaffold proteins containing a p‐azido‐L‐phenylalanine (Az) residue and catalytically active bicyclononyne‐substituted metal complexes. The high efficiency of this reaction allows rapid ArM formation when using Az residues within the scaffold protein in the presence of cysteine residues or various reactive components of cellular lysate. In general, cofactor‐based ArM formation allows the use of any desired metal complex to build unique inorganic protein materials. SPAAC covalent linkage further decouples the native function of the scaffold from the installation process because it is not affected by native amino acid residues; as long as an Az residue can be incorporated, an ArM can be generated. We have demonstrated the scope of this method with respect to both the scaffold and cofactor components and established that the dirhodium ArMs generated can catalyze the decomposition of diazo compounds and both SiH and olefin insertion reactions involving these carbene precursors.

Metal:

Rh

Ligand type:

Poly-carboxylic acid

Host protein:

tHisF

Anchoring strategy:

Covalent

Optimization:

---

Reaction:

Cyclopropanation

Max TON:

81

ee:

---

PDB:

1THF

Notes:

---

Metal:

Rh

Ligand type:

Poly-carboxylic acid

Host protein:

tHisF

Anchoring strategy:

Covalent

Optimization:

---

Reaction:

Si-H Insertion

Max TON:

7

ee:

---

PDB:

1THF

Notes:

---

A Highly Active Biohybrid Catalyst for Olefin Metathesis in Water: Impact of a Hydrophobic Cavity in a β-Barrel Protein

A series of Grubbs–Hoveyda type catalyst precursors for olefin metathesis containing a maleimide moiety in the backbone of the NHC ligand was covalently incorporated in the cavity of the β-barrel protein nitrobindin. By using two protein mutants with different cavity sizes and choosing the suitable spacer length, an artificial metalloenzyme for olefin metathesis reactions in water in the absence of any organic cosolvents was obtained. High efficiencies reaching TON > 9000 in the ROMP of a water-soluble 7-oxanorbornene derivative and TON > 100 in ring-closing metathesis (RCM) of 4,4-bis(hydroxymethyl)-1,6-heptadiene in water under relatively mild conditions (pH 6, T = 25–40 °C) were observed.

Metal:

Ru

Ligand type:

Carbene

Host protein:

Nitrobindin (Nb)

Anchoring strategy:

Covalent

Optimization:

Chemical

Reaction:

Olefin metathesis

Max TON:

9900

ee:

---

PDB:

---

Notes:

ROMP (cis/trans: 48/52)

Metal:

Ru

Ligand type:

Carbene

Host protein:

Nitrobindin (Nb)

Anchoring strategy:

Covalent

Optimization:

Chemical

Reaction:

Olefin metathesis

Max TON:

100

ee:

---

PDB:

---

Notes:

RCM

A Highly Specific Metal-Activated Catalytic Antibody

n/a

Metal:

Zn

Ligand type:

Undefined

Host protein:

IgG 84A3

Anchoring strategy:

Undefined

Optimization:

---

Max TON:

---

ee:

---

PDB:

---

Notes:

Substrate specificty

A Hybrid Ring- Opening Metathesis Polymerization Catalyst Based on an Engineered Variant of the Beta-Barrel Protein FhuA

A β‐barrel protein hybrid catalyst was prepared by covalently anchoring a Grubbs–Hoveyda type olefin metathesis catalyst at a single accessible cysteine amino acid in the barrel interior of a variant of β‐barrel transmembrane protein ferric hydroxamate uptake protein component A (FhuA). Activity of this hybrid catalyst type was demonstrated by ring‐opening metathesis polymerization of a 7‐oxanorbornene derivative in aqueous solution.

Metal:

Ru

Ligand type:

Carbene

Host protein:

FhuA ΔCVFtev

Anchoring strategy:

Covalent

Optimization:

Chemical

Reaction:

Olefin metathesis

Max TON:

955

ee:

---

PDB:

---

Notes:

ROMP

A Hydrogenase Model System Based on the Sequence of Cytochrome c: Photochemical Hydrogen Evolution in Aqueous Media

The diiron carbonyl cluster is held by a native CXXC motif, which includes Cys14 and Cys17, in the cytochrome c sequence. It is found that the diiron carbonyl complex works well as a catalyst for H2 evolution. It has a TON of ∼80 over 2 h at pH 4.7 in the presence of a Ru-photosensitizer and ascorbate as a sacrificial reagent in aqueous media.

Metal:

Fe

Ligand type:

Carbonyl

Host protein:

Cytochrome c

Anchoring strategy:

Dative

Optimization:

---

Reaction:

H2 evolution

Max TON:

82

ee:

---

PDB:

---

Notes:

Horse heart cytochrome C

Albumin-Conjugated Corrole Metal Complexes: Extremely Simple Yet Very Efficient Biomimetic Oxidation Systems

An extremely simple biomimetic oxidation system, consisting of mixing metal complexes of amphiphilic corroles with serum albumins, utilizes hydrogen peroxide for asymmetric sulfoxidation in up to 74% ee. The albumin-conjugated manganese corroles also display catalase-like activity, and mechanistic evidence points toward oxidant-coordinated manganese(III) as the prime reaction intermediate.

Metal:

Mn

Ligand type:

Corrole

Anchoring strategy:

Supramolecular

Optimization:

Chemical & genetic

Reaction:

Sulfoxidation

Max TON:

8

ee:

74

PDB:

---

Notes:

---

Metal:

Mn

Ligand type:

Corrole

Anchoring strategy:

Supramolecular

Optimization:

Chemical & genetic

Reaction:

Sulfoxidation

Max TON:

42

ee:

52

PDB:

---

Notes:

---

Alteration of the Oxygen-Dependent Reactivity of De Novo Due Ferri Proteins

De novo proteins provide a unique opportunity to investigate the structure–function relationships of metalloproteins in a minimal, well-defined and controlled scaffold. Here, we describe the rational programming of function in a de novo designed di-iron carboxylate protein from the Due Ferri family. Originally created to catalyse the O2-dependent, two-electron oxidation of hydroquinones, the protein was reprogrammed to catalyse the selective N-hydroxylation of arylamines by remodelling the substrate access cavity and introducing a critical third His ligand to the metal-binding cavity. Additional second- and third-shell modifications were required to stabilize the His ligand in the core of the protein. These structural changes resulted in at least a 106-fold increase in the relative rate between the arylamine N-hydroxylation and hydroquinone oxidation reactions. This result highlights the potential for using de novo proteins as scaffolds for future investigations of the geometric and electronic factors that influence the catalytic tuning of di-iron active sites.

Metal:

Fe

Ligand type:

Amino acid

Host protein:

Due Ferro 1

Anchoring strategy:

Dative

Optimization:

Genetic

Reaction:

N-Hydroxylation

Max TON:

---

ee:

---

PDB:

2LFD

Notes:

---

A Metal Ion Regulated Artificial Metalloenzyme

Regulation of enzyme activity is essential in living cells. The rapidly increasing number of designer enzymes with new-to-nature activities makes it necessary to develop novel strategies for controlling their catalytic activity. Here we present the development of a metal ion regulated artificial metalloenzyme created by combining two anchoring strategies, covalent and supramolecular, for introducing a regulatory and a catalytic site, respectively. This artificial metalloenzyme is activated in the presence of Fe2+ ions, but only marginally in the presence of Zn2+.

Metal:

Fe

Ligand type:

Bypyridine

Host protein:

LmrR

Anchoring strategy:

Covalent

Optimization:

Genetic

Max TON:

14

ee:

75

PDB:

---

Notes:

---

Metal:

Zn

Ligand type:

Bypyridine

Host protein:

LmrR

Anchoring strategy:

Covalent

Optimization:

Genetic

Max TON:

6

ee:

80

PDB:

---

Notes:

---

An Artificial Di-Iron Oxo-Orotein with Phenol Oxidase Activity

Here we report the de novo design and NMR structure of a four-helical bundle di-iron protein with phenol oxidase activity. The introduction of the cofactor-binding and phenol-binding sites required the incorporation of residues that were detrimental to the free energy of folding of the protein. Sufficient stability was, however, obtained by optimizing the sequence of a loop distant from the active site.

Metal:

Fe

Ligand type:

Amino acid

Host protein:

Due Ferro 1

Anchoring strategy:

Dative

Optimization:

Genetic

Reaction:

Alcohol oxidation

Max TON:

>50

ee:

---

PDB:

2KIK

Notes:

kcat/KM ≈ 1380 M-1*min-1

Metal:

Fe

Ligand type:

Amino acid

Host protein:

Due Ferro 1

Anchoring strategy:

Dative

Optimization:

Genetic

Reaction:

Amine oxidation

Max TON:

---

ee:

---

PDB:

2KIK

Notes:

kcat/KM ≈ 83 M-1*min-1

An Artificial Enzyme Made by Covalent Grafting of an FeII Complex into β-Lactoglobulin: Molecular Chemistry, Oxidation Catalysis, and Reaction-Intermediate Monitoring in a Protein

An artificial metalloenzyme based on the covalent grafting of a nonheme FeII polyazadentate complex into bovine β‐lactoglobulin has been prepared and characterized by using various spectroscopic techniques. Attachment of the FeII catalyst to the protein scaffold is shown to occur specifically at Cys121. In addition, spectrophotometric titration with cyanide ions based on the spin‐state conversion of the initial high spin (S=2) FeII complex into a low spin (S=0) one allows qualitative and quantitative characterization of the metal center’s first coordination sphere. This biohybrid catalyst activates hydrogen peroxide to oxidize thioanisole into phenylmethylsulfoxide as the sole product with an enantiomeric excess of up to 20 %. Investigation of the reaction between the biohybrid system and H2O2 reveals the generation of a high spin (S=5/2) FeIII(η2‐O2) intermediate, which is proposed to be responsible for the catalytic sulfoxidation of the substrate.

Metal:

Fe

Ligand type:

Poly-pyridine

Host protein:

ß-lactoglobulin

Anchoring strategy:

Covalent

Optimization:

---

Reaction:

Sulfoxidation

Max TON:

5.6

ee:

20

PDB:

---

Notes:

---

An Artificial Heme Enzyme for Cyclopropanation Reactions

Metal:

Fe

Ligand type:

Protoporphyrin IX

Host protein:

LmrR

Anchoring strategy:

Supramolecular

Optimization:

Chemical & genetic

Reaction:

Cyclopropanation

Max TON:

449

ee:

51

PDB:

6FUU

Notes:

---

An Artificial Imine Reductase Based on the Ribonuclease S Scaffold

Metal:

Ir

Ligand type:

Amino acid; Cp*

Host protein:

Ribonuclease S

Anchoring strategy:

Supramolecular

Optimization:

Genetic

Max TON:

4

ee:

18

PDB:

---

Notes:

---

An Artificial Metalloenzyme: Creation of a Designed Copper Binding Site in a Thermostable Protein

Guided by nature: A designed binding site comprising the His/His/Asp motif for CuII complexation has been constructed in a robust protein by site‐specific mutagenesis (see picture). The artificial metalloenzyme catalyzes an enantioselective Diels–Alder reaction.

Metal:

Cu

Ligand type:

Amino acid

Host protein:

tHisF

Anchoring strategy:

Dative

Optimization:

Genetic

Max TON:

6.7

ee:

46

PDB:

---

Notes:

---

An Artificial Metalloenzyme for Carbene Transfer Based on a Biotinylated Dirhodium Anchored Within Streptavidin

Metal:

Rh

Ligand type:

Carboxylate

Host protein:

Streptavidin (Sav)

Anchoring strategy:

Supramolecular

Optimization:

Chemical & genetic

Reaction:

Cyclopropanation

Max TON:

~60

ee:

---

PDB:

---

Notes:

Cyclopropanation reaction was also performed in the E. coli periplasm.

Metal:

Rh

Ligand type:

Carboxylate

Host protein:

Streptavidin (Sav)

Anchoring strategy:

Supramolecular

Optimization:

Chemical & genetic

Reaction:

C-H insertion

Max TON:

~60

ee:

---

PDB:

---

Notes:

---

An Artificial Metalloenzyme for Olefin Metathesis

A Grubbs–Hoveyda type olefin metathesis catalyst, equipped with an electrophilic bromoacetamide group, was used to modify a cysteine-containing variant of a small heat shock protein from Methanocaldococcus jannaschii. The resulting artificial metalloenzyme was found to be active under acidic conditions in a benchmark ring closing metathesis reaction.

Metal:

Ru

Ligand type:

Carbene

Anchoring strategy:

Covalent

Optimization:

---

Reaction:

Olefin metathesis

Max TON:

25

ee:

---

PDB:

---

Notes:

RCM