Annotations: 8RQF

Cryo-EM structure of human NTCP-Bulevirtide complex

External Resource: Annotation

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

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B [auth H]	Arf	e8rqfH01	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: Arf	ECOD (v295)
D [auth K]	CoV_Methyltr_2	e8rqfK1	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: CoV_Methyltr_2	ECOD (v295)
C [auth L]	Arf	e8rqfL01	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: Arf	ECOD (v295)
A	CoV_Methyltr_2	e8rqfA1	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: CoV_Methyltr_2	ECOD (v295)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth H]	Heavy Chain	IGHV3	-	polymerase \| sodium/bile acid cotransporter	SAbDab (2026-07-10)
D [auth K]	Heavy Chain	IGHV1	-	-	SAbDab (2026-07-10)
C [auth L]	Light Chain	IGKV1	Kappa	polymerase \| sodium/bile acid cotransporter	SAbDab (2026-07-10)

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 [auth H]	Heavy chain of Fab3	-	-	-
E [auth B]	Polymerase	-	viral process fusion of virus membrane with host endosome membrane membrane fusion involved in viral entry into host cell virion attachment to host cell biological process involved in interspecies interaction between organisms adhesion of symbiont to host cell viral life cycle adhesion of symbiont to host biological process involved in interaction with host biological process involved in symbiotic interaction import into cell receptor-mediated endocytosis of virus by host cell transport establishment of localization viral process fusion of virus membrane with host endosome membrane membrane fusion involved in viral entry into host cell virion attachment to host cell biological process involved in interspecies interaction between organisms adhesion of symbiont to host cell viral life cycle adhesion of symbiont to host biological process involved in interaction with host biological process involved in symbiotic interaction import into cell receptor-mediated endocytosis of virus by host cell transport establishment of localization caveolin-mediated endocytosis vesicle-mediated transport localization symbiont entry into host cell caveolin-mediated endocytosis of virus by host cell symbiont entry into host cellular process endocytosis involved in viral entry into host cell receptor-mediated endocytosis endocytosis virion assembly viral budding viral budding from endoplasmic reticulum membrane	virion component viral membrane viral envelope cellular anatomical structure membrane virion membrane
D [auth K]	Fab-specific nanobody	-	-	-
C [auth L]	Light chain of Fab3	-	-	-
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 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 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 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 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 carboxylic acid transport transport lipid localization 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 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
E [auth B]	IPR000349	Large envelope protein S	Family
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: PDBTM PDBTM Database Homepage

Chains	External Link	Comment
A, E [auth B]	PDBTM	Annotated as membrane protein by PDBTM

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