Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyNagB/RpiA/CoA transferase-like 8039331 3000693 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyNagB/RpiA/CoA transferase-like 8039331 3000693 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
A5-FTHF_cyc-lige1u3fA1 A: a/b three-layered sandwichesX: Rossmann-likeH: Rossmann-relatedT: NagB/RpiA/CoA transferase-likeF: 5-FTHF_cyc-ligECOD (1.6)
B5-FTHF_cyc-lige1u3fB1 A: a/b three-layered sandwichesX: Rossmann-likeH: Rossmann-relatedT: NagB/RpiA/CoA transferase-likeF: 5-FTHF_cyc-ligECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.40.50.10420 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold NagB/RpiA/CoA transferase-likeCATH (4.3.0)
B3.40.50.10420 Alpha Beta 3-Layer(aba) Sandwich Rossmann fold NagB/RpiA/CoA transferase-likeCATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B
PF018125-formyltetrahydrofolate cyclo-ligase family (5-FTHF_cyc-lig)5-formyltetrahydrofolate cyclo-ligase family- Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B
5,10-Methenyltetrahydrofolate Synthetase

InterPro: Protein Family Classification InterPro Database Homepage

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

ChainsEnzyme NameDescriptionCatalytic Residues
5-formyltetrahydrofolate cyclo-ligase  M-CSA #541

Tetrahydrofolates (THFs) are cofactors that donate or accept single carbon units in metabolic processes. 5,10-methenyltetrahydrofolate synthetase (MTHFS) is the only known enzyme to use 5-formylTHF. MTHFS catalyses tbe conversion of 5-formyTHF to 5,10-methenylTHF coupled to the hydrolysis of ATP to ADP in the presence of magnesium.
In solution, MTHFS exists 50% dimeric form, 50% in monomeric form.

Defined by 3 residues: ARG:A-140 [auth A-115]ASP:A-149 [auth A-124]ASP:A-179 [auth A-154]
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