Annotations: 1U3F

Structural and Functional Characterization of a 5,10-Methenyltetrahydrofolate Synthetase from Mycoplasma pneumoniae (GI: 13508087)

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Structure Motif: Primary M-CSA Annotation

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
B	d1u3fb_	Alpha and beta proteins (a/b)	NagB/RpiA/CoA transferase-like	NagB/RpiA/CoA transferase-like	Methenyltetrahydrofolate synthetase	5,10-methenyltetrahydrofolate synthetase homolog MPN348	(Mycoplasmoides pneumoniae ) [TaxId: 2104 ],	SCOPe (2.08)
A	d1u3fa_	Alpha and beta proteins (a/b)	NagB/RpiA/CoA transferase-like	NagB/RpiA/CoA transferase-like	Methenyltetrahydrofolate synthetase	5,10-methenyltetrahydrofolate synthetase homolog MPN348	(Mycoplasmoides pneumoniae ) [TaxId: 2104 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2B Superfamily	NagB/RpiA/CoA transferase-like	8039331	3000693	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	NagB/RpiA/CoA transferase-like	8039331	3000693	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	Ras	e1u3fB1	A: alpha arrays	X: C-terminal subdomain in Lon-related proteases catalytic domains	H: C-terminal subdomain in Lon-related proteases catalytic domains	T: C-terminal subdomain in Lon-related proteases catalytic domains	F: Ras	ECOD (v295.2)
A	Ras	e1u3fA1	A: alpha arrays	X: C-terminal subdomain in Lon-related proteases catalytic domains	H: C-terminal subdomain in Lon-related proteases catalytic domains	T: C-terminal subdomain in Lon-related proteases catalytic domains	F: Ras	ECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	3.40.50.10420	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	NagB/RpiA/CoA transferase-like	CATH (4.3.0)
A	3.40.50.10420	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	NagB/RpiA/CoA transferase-like	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF01812	5-formyltetrahydrofolate cyclo-ligase family (5-FTHF_cyc-lig)	5-formyltetrahydrofolate cyclo-ligase family	5-formyltetrahydrofolate cyclo-ligase or methenyl-THF synthetase EC:6.3.3.2 catalyses the interchange of 5-formyltetrahydrofolate (5-FTHF) to 5-10-methenyltetrahydrofolate, this requires ATP and Mg2+ [1]. 5-FTHF is used in chemotherapy where it is cl ...	5-formyltetrahydrofolate cyclo-ligase or methenyl-THF synthetase EC:6.3.3.2 catalyses the interchange of 5-formyltetrahydrofolate (5-FTHF) to 5-10-methenyltetrahydrofolate, this requires ATP and Mg2+ [1]. 5-FTHF is used in chemotherapy where it is clinically known as Leucovorin [2].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	5,10-Methenyltetrahydrofolate Synthetase	catalytic activity cyclo-ligase activity ligase activity, forming carbon-nitrogen bonds 5-formyltetrahydrofolate cyclo-ligase activity ligase activity	folic acid-containing compound biosynthetic process modified amino acid biosynthetic process modified amino acid metabolic process biosynthetic process folic acid-containing compound metabolic process tetrahydrofolate interconversion pteridine-containing compound biosynthetic process metabolic process cellular process small molecule metabolic process tetrahydrofolate biosynthetic process pteridine-containing compound metabolic process tetrahydrofolate metabolic process one-carbon metabolic process	cellular anatomical structure intracellular anatomical structure cytoplasm

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR024185	5-formyltetrahydrofolate cyclo-ligase-like domain superfamily	Homologous Superfamily
A, B	IPR037171	NagB/RpiA transferase-like	Homologous Superfamily
A, B	IPR002698	5-formyltetrahydrofolate cyclo-ligase	Family

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

Chains	Enzyme Name	Description	Catalytic Residues
A	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] \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 6.3.3.2 (PDB Primary Data) Search M-CSA Motif + EC 6.3.3.2