3WV7 image
Entry Detail
PDB ID:
3WV7
Keywords:
Title:
HcgE from Methanothermobacter marburgensis
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2014-05-16
Release Date:
2015-04-29
Method Details:
Experimental Method:
Resolution:
1.60 Å
R-Value Free:
0.19
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Hmd co-occurring protein HcgE
Chain IDs:A, B, C
Chain Length:218
Number of Molecules:3
Biological Source:Methanothermobacter marburgensis
Ligand Molecules
Primary Citation
Protein-pyridinol thioester precursor for biosynthesis of the organometallic acyl-iron ligand in [Fe]-hydrogenase cofactor
Nat Commun 6 6895 6895 (2015)
PMID: 25882909 DOI: 10.1038/ncomms7895

Abstact

The iron-guanylylpyridinol (FeGP) cofactor of [Fe]-hydrogenase contains a prominent iron centre with an acyl-Fe bond and is the only acyl-organometallic iron compound found in nature. Here, we identify the functions of HcgE and HcgF, involved in the biosynthesis of the FeGP cofactor using structure-to-function strategy. Analysis of the HcgE and HcgF crystal structures with and without bound substrates suggest that HcgE catalyses the adenylylation of the carboxy group of guanylylpyridinol (GP) to afford AMP-GP, and subsequently HcgF catalyses the transesterification of AMP-GP to afford a Cys (HcgF)-S-GP thioester. Both enzymatic reactions are confirmed by in vitro assays. The structural data also offer plausible catalytic mechanisms. This strategy of thioester activation corresponds to that used for ubiquitin activation, a key event in the regulation of multiple cellular processes. It further implicates a nucleophilic attack onto the acyl carbon presumably via an electron-rich Fe(0)- or Fe(I)-carbonyl complex in the Fe-acyl formation.

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Primary Citation of related structures