4X8D image
Entry Detail
PDB ID:
4X8D
Keywords:
Title:
Ergothioneine-biosynthetic sulfoxide synthase EgtB in complex with N,N-dimethyl-histidine and gamma-glutamyl-cysteine
Biological Source:
PDB Version:
Deposition Date:
2014-12-10
Release Date:
2015-01-28
Method Details:
Experimental Method:
Resolution:
1.98 Å
R-Value Free:
0.17
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 43 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Sulfoxide synthase EgtB
Chain IDs:A, B
Chain Length:447
Number of Molecules:2
Biological Source:Mycobacterium thermoresistibile ATCC 19527
Primary Citation
Structure of the Sulfoxide Synthase EgtB from the Ergothioneine Biosynthetic Pathway.
Angew.Chem.Int.Ed.Engl. 54 2821 2824 (2015)
PMID: 25597398 DOI: 10.1002/anie.201410045

Abstact

The non-heme iron enzyme EgtB catalyzes O2 -dependent C-S bond formation between γ-glutamyl cysteine and N-α-trimethyl histidine as the central step in ergothioneine biosynthesis. Both, the catalytic activity and the architecture of EgtB are distinct from known sulfur transferases or thiol dioxygenases. The crystal structure of EgtB from Mycobacterium thermoresistibile in complex with γ-glutamyl cysteine and N-α-trimethyl histidine reveals that the two substrates and three histidine residues serve as ligands in an octahedral iron binding site. This active site geometry is consistent with a catalytic mechanism in which C-S bond formation is initiated by an iron(III)-complexed thiyl radical attacking the imidazole ring of N-α-trimethyl histidine.

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