6ESU

Artificial imine reductase mutant S112A-N118P-K121A-S122M


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.78 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.195 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Directed Evolution of an Artificial Imine Reductase.

Hestericova, M.Heinisch, T.Alonso-Cotchico, L.Marechal, J.D.Vidossich, P.Ward, T.R.

(2018) Angew Chem Int Ed Engl 57: 1863-1868

  • DOI: https://doi.org/10.1002/anie.201711016
  • Primary Citation of Related Structures:  
    6ESS, 6ESU

  • PubMed Abstract: 

    Artificial metalloenzymes, resulting from incorporation of a metal cofactor within a host protein, have received increasing attention in the last decade. The directed evolution is presented of an artificial transfer hydrogenase (ATHase) based on the biotin-streptavidin technology using a straightforward procedure allowing screening in cell-free extracts. Two streptavidin isoforms were yielded with improved catalytic activity and selectivity for the reduction of cyclic imines. The evolved ATHases were stable under biphasic catalytic conditions. The X-ray structure analysis reveals that introducing bulky residues within the active site results in flexibility changes of the cofactor, thus increasing exposure of the metal to the protein surface and leading to a reversal of enantioselectivity. This hypothesis was confirmed by a multiscale approach based mostly on molecular dynamics and protein-ligand dockings.


  • Organizational Affiliation

    Department Chemistry, University of Basel, Mattenstrasse 24a, BPR 1096, Basel, 4002, Switzerland.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Streptavidin159Streptomyces avidiniiMutation(s): 4 
UniProt
Find proteins for P22629 (Streptomyces avidinii)
Explore P22629 
Go to UniProtKB:  P22629
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP22629
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
6IR
Query on 6IR

Download Ideal Coordinates CCD File 
B [auth A]5-[(3~{a}~{S},4~{S},6~{a}~{R})-2-oxidanylidene-1,3,3~{a},4,6,6~{a}-hexahydrothieno[3,4-d]imidazol-4-yl]-~{N}-[4-(2-azanylethylsulfamoyl)phenyl]pentanamide
C18 H27 N5 O4 S2
ZDLCBMIPYXADBN-ZOBUZTSGSA-N
IR
Query on IR

Download Ideal Coordinates CCD File 
C [auth A],
D [auth A],
E [auth A],
F [auth A]
IRIDIUM ION
Ir
MOHYGSBMXIJZBJ-UHFFFAOYSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
H [auth A]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
ACT
Query on ACT

Download Ideal Coordinates CCD File 
G [auth A]ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.78 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.195 
  • Space Group: I 41 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.801α = 90
b = 57.801β = 90
c = 178.273γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-01-03
    Type: Initial release
  • Version 1.1: 2018-01-24
    Changes: Database references
  • Version 1.2: 2018-02-14
    Changes: Database references
  • Version 1.3: 2024-01-17
    Changes: Data collection, Database references, Refinement description