Annotations: 9MSY

G002-480-0546 Fab in complex with V703-0537_T278M_L14 SOSIP and BG18 Fab

External Resource: Annotation

Domain Annotation: ECOD Classification
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)
H [auth M]	Beta-Casp	e9msyM1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
M [auth Q]	Beta-Casp	e9msyQ1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
C [auth I]	Beta-Casp	e9msyI1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
L [auth O]	Beta-Casp	e9msyO1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
G [auth J]	Beta-Casp	e9msyJ1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
B [auth G]	Beta-Casp	e9msyG1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
E [auth H], J [auth K], O [auth P]	Heavy Chain	IGHV1	-	v703-0537_t278m_l14 sosip	SAbDab (2026-06-12)
D [auth L], I [auth N], N [auth R]	Light Chain	IGKV3	Kappa	v703-0537_t278m_l14 sosip	SAbDab (2026-06-12)
C [auth I], H [auth M], M [auth Q]	Light Chain	IGLV3	Lambda	v703-0537_t278m_l14 sosip	SAbDab (2026-06-12)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
E [auth H], J [auth K], O [auth P]	G002-480-0546 Fab heavy chain	-	-	-
D [auth L], I [auth N], N [auth R]	G002-480-0546 Fab light chain	-	-	-
C [auth I], H [auth M], M [auth Q]	BG18 Fab light chain	-	-	-
B [auth G], G [auth J], L [auth O]	BG18 Fab heavy chain	-	-	-
A, F [auth B], K [auth C]	V703-0537_T278M_L14 SOSIP	structural molecule activity	viral process fusion of virus membrane with host endosome membrane membrane fusion involved in viral entry into host cell 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 viral process fusion of virus membrane with host endosome membrane membrane fusion involved in viral entry into host cell 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 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 virion attachment to host cell adhesion of symbiont to host cell adhesion of symbiont to host symbiont-mediated perturbation of host defense response symbiont-mediated perturbation of host process modulation of process of another organism	virion component viral membrane viral envelope host cell plasma membrane host cellular component cellular anatomical structure host cell part host cell membrane other organism part virion membrane host intracellular membrane-bounded organelle host intracellular part host cell cytoplasm part host intracellular organelle virion component viral membrane viral envelope host cell plasma membrane host cellular component cellular anatomical structure host cell part host cell membrane other organism part virion membrane host intracellular membrane-bounded organelle host intracellular part host cell cytoplasm part host intracellular organelle host cell endosome membrane host cell cytoplasm host cell endosome host intracellular region

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, F [auth B], K [auth C]	IPR000777	Human immunodeficiency virus 1, envelope glycoprotein Gp120	Domain
A, F [auth B], K [auth C]	IPR036377	Gp120 core superfamily	Homologous Superfamily
A, F [auth B], K [auth C]	IPR000328	Retroviral envelope protein GP41-like	Domain

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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.

9MSY | pdb_00009msy

G002-480-0546 Fab in complex with V703-0537_T278M_L14 SOSIP and BG18 Fab

External Resource: Annotation

Domain Annotation: ECOD Classification ECOD Database Homepage

SAbDab Antibody Annotation SAbDab Database Homepage

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

InterPro: Protein Family Classification InterPro Database Homepage