Annotations: 7ZYI

Structure of the human sodium/bile acid cotransporter (NTCP) in complex with Fab and nanobody

External Resource: Annotation

Domain Annotation: ECOD Classification
Domain Annotation: CATH
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations
Membrane Protein Annotation: OPM
Membrane Protein Annotation: PDBTM
Membrane Protein Annotation: mpstruc

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
D [auth K]	Glycos_transf_N	e7zyiK1	A: beta barrels	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: Glycos_transf_N	ECOD (v294.2)
C [auth L]	Glycos_transf_N	e7zyiL1	A: beta barrels	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: Glycos_transf_N	ECOD (v294.2)
B [auth H]	Glycos_transf_N	e7zyiH1	A: beta barrels	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: Glycos_transf_N	ECOD (v294.2)
A	Glycos_transf_N	e7zyiA1	A: beta barrels	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: Glycos_transf_N	ECOD (v294.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
D [auth K]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
C [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
B [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (utative)
A	1.20.1530.20	Mainly Alpha	Up-down Bundle	Na+/H+ antiporter like fold		CATH (utative)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
D [auth K]	Heavy Chain	IGHV1	-	-	SAbDab (2026-05-08)
C [auth L]	Light Chain	IGKV1	Kappa	sodium/bile acid cotransporter	SAbDab (2026-05-08)
B [auth H]	Heavy Chain	IGHV3	-	sodium/bile acid cotransporter	SAbDab (2026-05-08)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF01758	Sodium Bile acid symporter family (SBF)	Sodium Bile acid symporter family	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D [auth K]	Nanobody	-	-	-
C [auth L]	light chain of Fab	-	-	-
B [auth H]	heavy chain of Fab	-	-	-
A	Sodium/bile acid cotransporter	protein binding binding virus receptor activity exogenous protein binding monoatomic cation transmembrane transporter activity solute:sodium symporter activity solute:monoatomic cation symporter activity lipid transmembrane transporter activity monocarboxylate:sodium symporter activity bile acid:sodium symporter activity carboxylic acid transmembrane transporter activity sodium ion transmembrane transporter activity secondary active transmembrane transporter activity secondary active monocarboxylate transmembrane transporter activity protein binding binding virus receptor activity exogenous protein binding monoatomic cation transmembrane transporter activity solute:sodium symporter activity solute:monoatomic cation symporter activity lipid transmembrane transporter activity monocarboxylate:sodium symporter activity bile acid:sodium symporter activity carboxylic acid transmembrane transporter activity sodium ion transmembrane transporter activity secondary active transmembrane transporter activity secondary active monocarboxylate transmembrane transporter activity organic acid:sodium symporter activity active transmembrane transporter activity monoatomic ion transmembrane transporter activity transporter activity monocarboxylic acid transmembrane transporter activity metal ion transmembrane transporter activity transmembrane transporter activity symporter activity bile acid transmembrane transporter activity	response to stimulus response to hormone response to endogenous stimulus response to chemical response to estrogen cellular response to stimulus cellular response to chemical stimulus cellular response to xenobiotic stimulus cellular process response to xenobiotic stimulus response to nutrient levels organic anion transport carboxylic acid transport transport response to stimulus response to hormone response to endogenous stimulus response to chemical response to estrogen cellular response to stimulus cellular response to chemical stimulus cellular response to xenobiotic stimulus cellular process response to xenobiotic stimulus response to nutrient levels organic anion transport carboxylic acid transport transport lipid localization bile acid and bile salt transport lipid transport organic hydroxy compound transport establishment of localization organic acid transport localization monocarboxylic acid transport macromolecule localization response to alcohol response to oxygen-containing compound response to ethanol	cell periphery cellular anatomical structure plasma membrane membrane basal part of cell basal plasma membrane plasma membrane region basolateral plasma membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR004710	Bile acid:sodium symporter	Family
A	IPR002657	Bile acid:sodium symporter/arsenical resistance protein Acr3	Family
A	IPR038770	Sodium/solute symporter superfamily	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	: Q14973	hepatitis B virus infection Liver Cirrhosis, Experimental cholestasis malignant colon neoplasm osteosarcoma lung cancer

Membrane Protein Annotation: OPM OPM Database Homepage

Chains	External Link	Type	Class	Superfamily	Family
A	OPM	Transmembrane	Alpha-helical polytopic	Monovalent cation-proton antiporter	Bile Acid:Na+ Symporter (BASS) Family

Membrane Protein Annotation: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Apical Sodium-Dependent Bile Acid Transporters (ASBT)	sodium taurocholate co-transporting polypeptide (NTCP) transporter in complex with Fab and nanobody

RCSB PDB is hosted by

RCSB PDB is a member of

RCSB Partners
Nucleic Acid Knowledgebase

CoreTrustSeal

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), 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 R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.