4R0V image
Entry Detail
PDB ID:
4R0V
Keywords:
Title:
[FeFe]-hydrogenase Oxygen Inactivation is Initiated by the Modification and Degradation of the H cluster 2Fe Subcluster
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2014-08-01
Release Date:
2015-01-28
Method Details:
Experimental Method:
Resolution:
2.29 Å
R-Value Free:
0.25
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Fe-hydrogenase
Chain IDs:A, B
Chain Length:514
Number of Molecules:2
Biological Source:Chlamydomonas reinhardtii
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
CSD A CYS 3-SULFINOALANINE
CSO A CYS S-HYDROXYCYSTEINE
Primary Citation
[FeFe]-Hydrogenase Oxygen Inactivation Is Initiated at the H Cluster 2Fe Subcluster.
J.Am.Chem.Soc. 137 1809 1816 (2015)
PMID: 25579778 DOI: 10.1021/ja510169s

Abstact

The [FeFe]-hydrogenase catalytic site H cluster is a complex iron sulfur cofactor that is sensitive to oxygen (O2). The O2 sensitivity is a significant barrier for production of hydrogen as an energy source in water-splitting, oxygenic systems. Oxygen reacts directly with the H cluster, which results in rapid enzyme inactivation and eventual degradation. To investigate the progression of O2-dependent [FeFe]-hydrogenase inactivation and the process of H cluster degradation, the highly O2-sensitive [FeFe]-hydrogenase HydA1 from the green algae Chlamydomonas reinhardtii was exposed to defined concentrations of O2 while monitoring the loss of activity and accompanying changes in H cluster spectroscopic properties. The results indicate that H cluster degradation proceeds through a series of reactions, the extent of which depend on the initial enzyme reduction/oxidation state. The degradation process begins with O2 interacting and reacting with the 2Fe subcluster, leading to degradation of the 2Fe subcluster and leaving an inactive [4Fe-4S] subcluster state. This final inactive degradation product could be reactivated in vitro by incubation with 2Fe subcluster maturation machinery, specifically HydF(EG), which was observed by recovery of enzyme activity.

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