7QHF

[FeFe]-hydrogenase I from Clostridium pasteurianum (CpI), variant G302S


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 

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This is version 1.2 of the entry. See complete history


Literature

A Dynamic Water Channel Affects O 2 Stability in [FeFe]-Hydrogenases.

Brocks, C.Das, C.K.Duan, J.Yadav, S.Apfel, U.P.Ghosh, S.Hofmann, E.Winkler, M.Engelbrecht, V.Schafer, L.V.Happe, T.

(2023) ChemSusChem : e202301365-e202301365

  • DOI: https://doi.org/10.1002/cssc.202301365
  • Primary Citation of Related Structures:  
    7QHF, 8CJY

  • PubMed Abstract: 

    [FeFe]-hydrogenases are capable of reducing protons at a high rate. However, molecular oxygen (O 2 ) induces the degradation of their catalytic cofactor, the H-cluster, which consists of a cubane [4Fe4S] subcluster (4Fe H ) and a unique diiron moiety (2Fe H ). Previous attempts to prevent O 2 -induced damage have focused on enhancing the protein's sieving effect for O 2 by blocking the hydrophobic gas channels that connect the protein surface and the 2Fe H . In this study, we aimed to block an O 2 diffusion pathway and shield 4Fe H instead. Molecular dynamics (MD) simulations identified a novel water channel (W H ) surrounding the H-cluster. As this hydrophilic path may be accessible for O 2 molecules we applied site-directed mutagenesis targeting amino acids along W H in proximity to 4Fe H to block O 2 diffusion. Protein film electrochemistry experiments demonstrate increased O 2 stabilities for variants G302S and S357T, and MD simulations based on high-resolution crystal structures confirmed an enhanced local sieving effect for O 2 in the environment of the 4Fe H in both cases. The results strongly suggest that, in wild type proteins, O 2 diffuses from the 4Fe H to the 2Fe H . These results reveal new strategies for improving the O 2 stability of [FeFe]-hydrogenases by focusing on the O 2 diffusion network near the active site.


  • Organizational Affiliation

    Faculty of Biology and Biotechnology, Photobiotechnology, Ruhr University Bochum, Universitätsstrasse 150, 44801, Bochum, Germany.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Iron hydrogenase 1
A, B
584Clostridium pasteurianumMutation(s): 1 
EC: 1.12.7.2
UniProt
Find proteins for P29166 (Clostridium pasteurianum)
Explore P29166 
Go to UniProtKB:  P29166
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP29166
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
402 (Subject of Investigation/LOI)
Query on 402

Download Ideal Coordinates CCD File 
C [auth A],
L [auth B]
dicarbonyl[bis(cyanide-kappaC)]-mu-(iminodimethanethiolatato-1kappaS:2kappaS)-mu-(oxomethylidene)diiron(2+)
C7 H5 Fe2 N3 O3 S2
LJPDYWPSPOWMIB-UHFFFAOYSA-N
SF4 (Subject of Investigation/LOI)
Query on SF4

Download Ideal Coordinates CCD File 
D [auth A]
E [auth A]
F [auth A]
G [auth A]
M [auth B]
D [auth A],
E [auth A],
F [auth A],
G [auth A],
M [auth B],
N [auth B],
O [auth B],
P [auth B]
IRON/SULFUR CLUSTER
Fe4 S4
LJBDFODJNLIPKO-UHFFFAOYSA-N
FES (Subject of Investigation/LOI)
Query on FES

Download Ideal Coordinates CCD File 
H [auth A],
Q [auth B]
FE2/S2 (INORGANIC) CLUSTER
Fe2 S2
NIXDOXVAJZFRNF-UHFFFAOYSA-N
GOL
Query on GOL

Download Ideal Coordinates CCD File 
J [auth A],
S [auth B]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
I [auth A],
K [auth A],
R [auth B],
T [auth B]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.63 Å
  • R-Value Free: 0.192 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.49α = 90
b = 72.22β = 97.32
c = 102.92γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XSCALEdata scaling
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
German Research Foundation (DFG)GermanyGRK2341

Revision History  (Full details and data files)

  • Version 1.0: 2023-09-27
    Type: Initial release
  • Version 1.1: 2023-10-25
    Changes: Database references
  • Version 1.2: 2023-11-29
    Changes: Database references