6FNU image
Deposition Date 2018-02-05
Release Date 2018-03-07
Last Version Date 2024-05-08
Entry Detail
PDB ID:
6FNU
Keywords:
Title:
Structure of S. cerevisiae Methylenetetrahydrofolate reductase 1, catalytic domain
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.56 Å
R-Value Free:
0.19
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Methylenetetrahydrofolate reductase 1
Gene (Uniprot):MET12
Chain IDs:A
Chain Length:308
Number of Molecules:1
Biological Source:Saccharomyces cerevisiae
Primary Citation
Structural basis for the regulation of human 5,10-methylenetetrahydrofolate reductase by phosphorylation and S-adenosylmethionine inhibition.
Nat Commun 9 2261 2261 (2018)
PMID: 29891918 DOI: 10.1038/s41467-018-04735-2

Abstact

The folate and methionine cycles are crucial for biosynthesis of lipids, nucleotides and proteins, and production of the methyl donor S-adenosylmethionine (SAM). 5,10-methylenetetrahydrofolate reductase (MTHFR) represents a key regulatory connection between these cycles, generating 5-methyltetrahydrofolate for initiation of the methionine cycle, and undergoing allosteric inhibition by its end product SAM. Our 2.5 Å resolution crystal structure of human MTHFR reveals a unique architecture, appending the well-conserved catalytic TIM-barrel to a eukaryote-only SAM-binding domain. The latter domain of novel fold provides the predominant interface for MTHFR homo-dimerization, positioning the N-terminal serine-rich phosphorylation region near the C-terminal SAM-binding domain. This explains how MTHFR phosphorylation, identified on 11 N-terminal residues (16 in total), increases sensitivity to SAM binding and inhibition. Finally, we demonstrate that the 25-amino-acid inter-domain linker enables conformational plasticity and propose it to be a key mediator of SAM regulation. Together, these results provide insight into the molecular regulation of MTHFR.

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