3WHP | pdb_00003whp

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	B12-binding_2	e3whpA2	A: alpha arrays	X: Methionine synthase domain-like (From Topology)	H: Methionine synthase domain-like (From Topology)	T: Methionine synthase domain-like	F: B12-binding_2	ECOD (1.6)
A	B12-binding	e3whpA1	A: a/b three-layered sandwiches	X: Flavodoxin-like	H: Class I glutamine amidotransferase-like	T: CheY-like	F: B12-binding	ECOD (1.6)

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.1240.10	Mainly Alpha	Orthogonal Bundle	Methyltransferase, Methionine Synthase (B12-binding Domains)	Chain A, domain 1	CATH (4.3.0)
A	3.40.50.280	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Cobalamin-binding domain	CATH (4.3.0)

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Probable transcriptional regulator	DNA binding binding nucleic acid binding vitamin binding cobalamin binding tetrapyrrole binding heterocyclic compound binding small molecule binding transcription regulator activity DNA-binding transcription factor activity cation binding ion binding metal ion binding identical protein binding DNA binding binding nucleic acid binding vitamin binding cobalamin binding tetrapyrrole binding heterocyclic compound binding small molecule binding transcription regulator activity DNA-binding transcription factor activity cation binding ion binding metal ion binding identical protein binding protein binding	-	-

Chains	Accession	Name	Type
A	IPR003759	Cobalamin (vitamin B12)-binding module, cap domain	Domain
A	IPR009061	Putative DNA-binding domain superfamily	Homologous Superfamily
A	IPR036724	Cobalamin-binding domain superfamily	Homologous Superfamily
A	IPR047057	MerR transcriptional regulator	Family
A	IPR006158	Cobalamin (vitamin B12)-binding domain	Domain
A	IPR036594	Methionine synthase domain	Homologous Superfamily
A	IPR000551	MerR-type HTH domain	Domain