Annotations: 9U9B

HBsAg in complex with HBC34 Fab

External Resource: Annotation

Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Thera-SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C [auth H]		e9u9bH1	A: alpha arrays	X: Hypothetical protein YqbG-like	H: Hypothetical protein YqbG-like	T: alpha/beta-Hydrolases	F:	ECOD (v295.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
D [auth L]	Light Chain	IGLV3	Lambda	middle s protein \| middle s protein	SAbDab (2026-09-11)
C [auth H]	Heavy Chain	IGHV3	-	middle s protein \| middle s protein	SAbDab (2026-09-11)

Thera-SAbDab Antibody Annotation Thera-SAbDab Database Homepage

Chain	Name	Target	Provenance Source
D [auth L]	Tobevibart	Human Papillomavirus Envelope Protein	Therapeutic SAbDab (2026-09-11)
C [auth H]	Tobevibart	Human Papillomavirus Envelope Protein	Therapeutic SAbDab (2026-09-11)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D [auth L]	HBC34 Fab Light Chain	-	-	-
C [auth H]	HBC34 Fab Heavy Chain	-	-	-
A, B	Middle S protein	-	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 component viral membrane viral envelope cellular anatomical structure membrane virion membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR000349	Large envelope protein S	Family

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