4O1F image
Entry Detail
PDB ID:
4O1F
Keywords:
Title:
Structure of a methyltransferase component in complex with THF involved in O-demethylation
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2013-12-15
Release Date:
2015-01-21
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.24
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Dihydropteroate synthase DHPS
Chain IDs:A, B
Chain Length:290
Number of Molecules:2
Biological Source:Desulfitobacterium hafniense
Ligand Molecules
Primary Citation
Structures of the methyltransferase component of Desulfitobacterium hafniense DCB-2 O-demethylase shed light on methyltetrahydrofolate formation
Acta Crystallogr.,Sect.D 71 1900 1908 (2015)
PMID: 26327380 DOI: 10.1107/S1399004715013061

Abstact

O-Demethylation by acetogenic or organohalide-respiring bacteria leads to the formation of methyltetrahydrofolate from aromatic methyl ethers. O-Demethylases, which are cobalamin-dependent, three-component enzyme systems, catalyse methyl-group transfers from aromatic methyl ethers to tetrahydrofolate via methylcobalamin intermediates. In this study, crystal structures of the tetrahydrofolate-binding methyltransferase module from a Desulfitobacterium hafniense DCB-2 O-demethylase were determined both in complex with tetrahydrofolate and the product methyltetrahydrofolate. While these structures are similar to previously determined methyltransferase structures, the position of key active-site residues is subtly altered. A strictly conserved Asn is displaced to establish a putative proton-transfer network between the substrate N5 and solvent. It is proposed that this supports the efficient catalysis of methyltetrahydrofolate formation, which is necessary for efficient O-demethylation.

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