7ONV

Carbonic anhydrase II mutant (I91C) dually binding an IrCp* complex to generate an artificial transfer hydrogenase (ATHase)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.04 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.183 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 4.1 of the entry. See complete history


Literature

A Dual Anchoring Strategy for the Directed Evolution of Improved Artificial Transfer Hydrogenases Based on Carbonic Anhydrase.

Stein, A.Chen, D.Igareta, N.V.Cotelle, Y.Rebelein, J.G.Ward, T.R.

(2021) ACS Cent Sci 7: 1874-1884

  • DOI: https://doi.org/10.1021/acscentsci.1c00825
  • Primary Citation of Related Structures:  
    7ONM, 7ONP, 7ONQ, 7ONV

  • PubMed Abstract: 

    Artificial metalloenzymes result from anchoring a metal cofactor within a host protein. Such hybrid catalysts combine the selectivity and specificity of enzymes with the versatility of (abiotic) transition metals to catalyze new-to-nature reactions in an evolvable scaffold. With the aim of improving the localization of an arylsulfonamide-bearing iridium-pianostool catalyst within human carbonic anhydrase II (hCAII) for the enantioselective reduction of prochiral imines, we introduced a covalent linkage between the host and the guest. Herein, we show that a judiciously positioned cysteine residue reacts with a p- nitropicolinamide ligand bound to iridium to afford an additional sulfonamide covalent linkage. Three rounds of directed evolution, performed on the dually anchored cofactor, led to improved activity and selectivity for the enantioselective reduction of harmaline (up to 97% ee ( R ) and >350 turnovers on a preparative scale). To evaluate the substrate scope, the best hits of each generation were tested with eight substrates. X-ray analysis, carried out at various stages of the evolutionary trajectory, was used to scrutinize (i) the nature of the covalent linkage between the cofactor and the host as well as (ii) the remodeling of the substrate-binding pocket.


  • Organizational Affiliation

    Department of Chemistry, University of Basel, BPR 1096, Mattenstrasse 24a, 4058 Basel, Switzerland.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Carbonic anhydrase 2261Homo sapiensMutation(s): 1 
Gene Names: CA2
EC: 4.2.1.1 (PDB Primary Data), 4.2.1.69 (PDB Primary Data)
UniProt & NIH Common Fund Data Resources
Find proteins for P00918 (Homo sapiens)
Explore P00918 
Go to UniProtKB:  P00918
PHAROS:  P00918
GTEx:  ENSG00000104267 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00918
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
VKZ (Subject of Investigation/LOI)
Query on VKZ

Download Ideal Coordinates CCD File 
C [auth A]4-[2-(4-azanyl-9-chloranyl-2',3',4',5',6'-pentamethyl-7-oxidanylidene-spiro[1$l^{4},8-diaza-9$l^{8}-iridabicyclo[4.3.0]nona-1,3,5-triene-9,1'-1$l^{8}-iridapentacyclo[2.2.0.0^{1,3}.0^{1,5}.0^{2,6}]hexane]-8-yl)ethyl]benzenesulfonamide
C24 H30 Cl Ir N4 O3 S
OZNKLFOMSCDAEE-UHFFFAOYSA-L
ZN
Query on ZN

Download Ideal Coordinates CCD File 
B [auth A]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
EDO
Query on EDO

Download Ideal Coordinates CCD File 
D [auth A]
E [auth A]
F [auth A]
G [auth A]
H [auth A]
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A]
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
VI3
Query on VI3
A
L-PEPTIDE LINKINGC3 H6 N O4 SCYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.04 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.183 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.278α = 90
b = 71.807β = 90
c = 73.694γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Swiss National Science FoundationSwitzerland200020_182046
European Molecular Biology Organization (EMBO)European UnionALTF 194-2017

Revision History  (Full details and data files)

  • Version 1.0: 2021-12-01
    Type: Initial release
  • Version 1.1: 2021-12-15
    Changes: Database references
  • Version 2.0: 2023-03-15
    Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Other, Polymer sequence, Source and taxonomy, Structure summary
  • Version 3.0: 2023-05-24
    Changes: Derived calculations, Non-polymer description
  • Version 4.0: 2023-11-15
    Changes: Atomic model, Data collection
  • Version 4.1: 2024-02-07
    Changes: Refinement description