2BB5

Structure of Human Transcobalamin in complex with Cobalamin

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
B	SCOP2 Family	Transcobalamin C-terminal domain-like	8050038	4006739	SCOP2 (2022-06-29)
B	SCOP2 Family	Transcobalamin N-terminal domain-like	8048588	4006152	SCOP2 (2022-06-29)
B	SCOP2 Superfamily	Transcobalamin C-terminal domain-like	8051861	3002041	SCOP2 (2022-06-29)
B	SCOP2 Superfamily	Six-hairpin glycosidases	8051860	3000970	SCOP2 (2022-06-29)
A	SCOP2B Superfamily	Six-hairpin glycosidases	8051860	3000970	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Transcobalamin C-terminal domain-like	8051861	3002041	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	Cobalamin_bind	e2bb5B2	A: alpha superhelices	X: Repetitive alpha hairpins	H: alpha/alpha toroid (From Topology)	T: alpha/alpha toroid	F: Cobalamin_bind	ECOD (1.6)
B	DUF4430	e2bb5B3	A: a+b two layers	X: beta-Grasp	H: Ubiquitin-related	T: Ubiquitin-like	F: DUF4430	ECOD (1.6)
A	Cobalamin_bind	e2bb5A1	A: alpha superhelices	X: Repetitive alpha hairpins	H: alpha/alpha toroid (From Topology)	T: alpha/alpha toroid	F: Cobalamin_bind	ECOD (1.6)
A	DUF4430	e2bb5A3	A: a+b two layers	X: beta-Grasp	H: Ubiquitin-related	T: Ubiquitin-like	F: DUF4430	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	1.50.10.20	Mainly Alpha	Alpha/alpha barrel	Glycosyltransferase		CATH (4.3.0)
B	2.170.130.30	Mainly Beta	Beta Complex	Ferric Hydroxamate Uptake Protein	Chain A, domain 1	CATH (4.3.0)
A	1.50.10.20	Mainly Alpha	Alpha/alpha barrel	Glycosyltransferase		CATH (4.3.0)
A	2.170.130.30	Mainly Beta	Beta Complex	Ferric Hydroxamate Uptake Protein	Chain A, domain 1	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF01122	Eukaryotic cobalamin-binding protein (Cobalamin_bind)	Eukaryotic cobalamin-binding protein	-	Repeat
A, B	PF14478	Domain of unknown function (DUF4430) (DUF4430)	Domain of unknown function (DUF4430)	Although this family has overlaps with SLBB, the majority of its sequences are unique. Several family members, eg UniProtKB:A0RGA8, that do not overlap have an LPXTG-cell wall anchor at their C-terminus, a SSF_Family 10_polysaccharide_lyase or Glycos ...	Although this family has overlaps with SLBB, the majority of its sequences are unique. Several family members, eg UniProtKB:A0RGA8, that do not overlap have an LPXTG-cell wall anchor at their C-terminus, a SSF_Family 10_polysaccharide_lyase or Glycosyltransferase structure associated with them in the middle region, as shown by InterPro, as well as this domain at the N-terminus.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	Transcobalamin II	protein binding binding cargo receptor ligand activity vitamin binding cobalamin binding organic cyclic compound binding tetrapyrrole binding heterocyclic compound binding small molecule binding cation binding ion binding metal ion binding	localization nitrogen compound transport transport vitamin transport organic substance transport cobalamin transport establishment of localization monoatomic ion transmembrane transport inorganic ion transmembrane transport metal ion transport inorganic cation transmembrane transport cobalt ion transport transmembrane transport monoatomic cation transmembrane transport localization nitrogen compound transport transport vitamin transport organic substance transport cobalamin transport establishment of localization monoatomic ion transmembrane transport inorganic ion transmembrane transport metal ion transport inorganic cation transmembrane transport cobalt ion transport transmembrane transport monoatomic cation transmembrane transport transition metal ion transport monoatomic ion transport cellular process monoatomic cation transport	cell periphery cell surface membrane plasma membrane cellular anatomical entity external side of plasma membrane side of membrane extracellular region membrane-bounded organelle intracellular anatomical structure lytic vacuole membrane-enclosed lumen vacuolar lumen vacuole cell periphery cell surface membrane plasma membrane cellular anatomical entity external side of plasma membrane side of membrane extracellular region membrane-bounded organelle intracellular anatomical structure lytic vacuole membrane-enclosed lumen vacuolar lumen vacuole intracellular membrane-bounded organelle lysosomal lumen intracellular organelle lumen intracellular organelle organelle lumen organelle cytoplasm lysosome extracellular space

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR002157	Cobalamin (vitamin B12)-binding protein	Family
A, B	IPR008930	Terpenoid cyclases/protein prenyltransferase alpha-alpha toroid	Homologous Superfamily
A, B	IPR027954	Transcobalamin-like, C-terminal domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A, B	Pharos: P20062	transcobalamin II deficiency megaloblastic anemia Leukoencephalopathies microcystic adenoma adenoma papillary adenoma prostate cancer colorectal cancer esophageal squamous cell carcinoma kidney Wilms tumor follicular thyroid adenoma inborn vitamin B12 deficiency pituitary cancer subependymal giant cell astrocytoma hereditary Wilms tumor transcobalamin II deficiency megaloblastic anemia Leukoencephalopathies microcystic adenoma adenoma papillary adenoma prostate cancer colorectal cancer esophageal squamous cell carcinoma kidney Wilms tumor follicular thyroid adenoma inborn vitamin B12 deficiency pituitary cancer subependymal giant cell astrocytoma hereditary Wilms tumor intellectual disability leukoencephalopathy with vanishing white matter Chagas disease Creutzfeldt Jacob disease inborn errors of metabolism Perlman syndrome autism cleft lip colorectal carcinoma

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.