Annotations: 7PQQ

Structure of thermostabilised human NTCP in complex with Megabody 91

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: MemProtMD
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)
B	Cation_ATPase	e7pqqB1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Cation_ATPase	ECOD (v294.2)
A	Cation_ATPase	e7pqqA1	A: beta barrels	X: Nuclear receptor ligand-binding domain	H: Immunoglobulin-related	T: Immunoglobulin/Fibronectin type III/E set domains/PapD-like	F: Cation_ATPase	ECOD (v294.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
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
B	Heavy Chain	IGHV1	-	sodium/bile acid cotransporter	SAbDab (2026-05-15)

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
B	Anti-RON nanobody,Megabody 91,Glucosidase YgjK	hydrolase activity, acting on glycosyl bonds alpha,alpha-trehalase activity hydrolase activity, hydrolyzing O-glycosyl compounds hydrolase activity trehalase activity catalytic activity glucosidase activity cation binding ion binding binding metal ion binding small molecule binding	cellular response to stimulus cellular response to stress response to stimulus DNA damage response response to stress cellular process carbohydrate metabolic process trehalose catabolic process catabolic process trehalose metabolic process oligosaccharide catabolic process oligosaccharide metabolic process carbohydrate catabolic process primary metabolic process cellular response to stimulus cellular response to stress response to stimulus DNA damage response response to stress cellular process carbohydrate metabolic process trehalose catabolic process catabolic process trehalose metabolic process oligosaccharide catabolic process oligosaccharide metabolic process carbohydrate catabolic process primary metabolic process disaccharide metabolic process metabolic process disaccharide catabolic process	protein-containing complex catalytic complex glucosidase complex
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
B	IPR012341	Six-hairpin glycosidase-like superfamily	Homologous Superfamily
B	IPR048450	Glucosidase YgjK, N-terminal domain	Domain
B	IPR054491	Mannosylglycerate hydrolase MGH1-like, glycoside hydrolase domain	Domain
B	IPR001661	Glycoside hydrolase, family 37	Family
B	IPR008928	Six-hairpin glycosidase superfamily	Homologous Superfamily
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, B	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, B	PDBTM	Annotated as membrane protein by PDBTM

Membrane Protein Annotation: MemProtMD MemProtMD Database Homepage

Chains	External Link	Comment
A, B	MemProtMD	Annotated as membrane protein by MemProtMD

Membrane Protein Annotation: mpstruc mpstruc Database Homepage

Chains	Resource Link	Group	Subgroup	Protein
A, B	mpstruc	TRANSMEMBRANE PROTEINS: ALPHA-HELICAL	Apical Sodium-Dependent Bile Acid Transporters (ASBT)	sodium taurocholate co-transporting polypeptide (NTCP) transporter in complex with nanobody 87

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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.