Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyFAD-linked oxidoreductase 8043872 3000663 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyFAD-linked oxidoreductase 8043872 3000663 SCOP2B (2022-06-29)
CSCOP2B SuperfamilyFAD-linked oxidoreductase 8043872 3000663 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AMTHFRe1zp3A1 A: a/b barrelsX: TIM beta/alpha-barrelH: TIM barrels (From Topology)T: TIM barrelsF: MTHFRECOD (1.6)
BMTHFRe1zp3B1 A: a/b barrelsX: TIM beta/alpha-barrelH: TIM barrels (From Topology)T: TIM barrelsF: MTHFRECOD (1.6)
CMTHFRe1zp3C1 A: a/b barrelsX: TIM beta/alpha-barrelH: TIM barrels (From Topology)T: TIM barrelsF: MTHFRECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.20.20.220 Alpha Beta Alpha-Beta Barrel TIM Barrel CATH (4.3.0)
B3.20.20.220 Alpha Beta Alpha-Beta Barrel TIM Barrel CATH (4.3.0)
C3.20.20.220 Alpha Beta Alpha-Beta Barrel TIM Barrel CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B, C
PF02219Methylenetetrahydrofolate reductase (MTHFR)Methylenetetrahydrofolate reductaseThis family includes the 5,10-methylenetetrahydrofolate reductase EC:1.7.99.5 from bacteria and methylenetetrahydrofolate reductase EC: 1.5.1.20 from eukaryotes. The structure for this domain is known [1] to be a TIM barrel.Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B, C
5,10-methylenetetrahydrofolate reductase

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

ChainsEnzyme NameDescriptionCatalytic Residues
methylenetetrahydrofolate reductase [NAD(P)H]  M-CSA #120

E. coli methylenetetrahydrofolate reductase (MTHFR) catalyses the NADH-dependent reduction of 5,10-methylenetetrahydrofolate (CH2-H4folate) to 5 methyltetrahydrofolate (CH3-H4folate) using the cofactor flavin adenine dinucleotide (FAD) as an intermediate hydride acceptor and donor. MTHFR is the only route of CH3-H4folate which is used by methionine synthase to convert homocysteine to methionine.

E. coli MTHFR is a homotetramer that dissociates into dimers on dilution. Its catalytic domain is a (beta-alpha)8 barrel. Bacterial MTHFR enzymes are simpler than mammalian MTHFR in that the catatlytic domain constitutes the entire sequence, with no regulatory sequence present.

Defined by 5 residues: SER:A-26GLU:A-28ASP:A-120PHE:A-223HIS:A-273
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