Annotations: 9CBN

HAstV1 spike in complex with neutralizing Fabs 3H4 and 3B4

External Resource: Annotation

Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Protein Family 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)
A	Hom_end	e9cbnA01	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Hom_end	ECOD (v294.2)
B	Hom_end	e9cbnB01	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Hom_end	ECOD (v294.2)
E	Hom_end	e9cbnE01	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Hom_end	ECOD (v294.2)
F	Hom_end	e9cbnF01	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Hom_end	ECOD (v294.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
A	Heavy Chain	IGHV1	-	structural protein	SAbDab (2026-05-15)
B	Light Chain	IGKV5	Kappa	structural protein	SAbDab (2026-05-15)
E, G	Heavy Chain	IGHV2	-	structural protein	SAbDab (2026-05-15)
F, H	Light Chain	IGLV1	Lambda	structural protein	SAbDab (2026-05-15)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
C, D	PF12226	Turkey astrovirus capsid protein (Astro_capsid_p)	Turkey astrovirus capsid protein	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	HAstV1 neutralizing Fab 3B4 heavy chain	-	-	-
B	HAstV1 neutralizing Fab 3B4 kappa chain	-	-	-
C, D	Structural protein	-	import into cell receptor-mediated endocytosis of virus by host cell biological process involved in interspecies interaction between organisms transport viral life cycle establishment of localization vesicle-mediated transport biological process involved in interaction with host biological process involved in symbiotic interaction localization symbiont entry into host cell clathrin-dependent endocytosis viral process symbiont entry into host import into cell receptor-mediated endocytosis of virus by host cell biological process involved in interspecies interaction between organisms transport viral life cycle establishment of localization vesicle-mediated transport biological process involved in interaction with host biological process involved in symbiotic interaction localization symbiont entry into host cell clathrin-dependent endocytosis viral process symbiont entry into host cellular process clathrin-dependent endocytosis of virus by host cell receptor-mediated endocytosis endocytosis endocytosis involved in viral entry into host cell	viral capsid T=3 icosahedral viral capsid icosahedral viral capsid virion component host cellular component host extracellular region cellular anatomical structure other organism part
E, G	HAstV1 neutralizing Fab 3H4 heavy chain	-	-	-
F, H	HAstV1 neutralizing Fab 3H4 lambda chain	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C, D	IPR004337	Astrovirus capsid protein, inner core domain	Domain
C, D	IPR029053	Viral coat protein subunit	Homologous Superfamily
C, D	IPR022027	Turkey astrovirus capsid protein	Family

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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.