Annotations: 9MIH

273-4D01 Fab in complex with HIV-1 BG505 SOSIP Env trimer and RM20A3 Fab

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
J [auth E]	SCOP2B Superfamily	gp120 core	8080371	3001390	SCOP2B (2022-06-29)
F [auth C]	SCOP2B Superfamily	gp120 core	8080371	3001390	SCOP2B (2022-06-29)
B [auth A]	SCOP2B Superfamily	gp120 core	8080371	3001390	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
L [auth M]	Beta-Casp	e9mihM1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
H [auth J]	Beta-Casp	e9mihJ1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
D [auth G]	Beta-Casp	e9mihG1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
M [auth N]	Beta-Casp	e9mihN1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
I [auth K]	Beta-Casp	e9mihK1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
E [auth I]	Beta-Casp	e9mihI1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
K [auth F]	Beta-Casp	e9mihF1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
G [auth D]	Beta-Casp	e9mihD1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
C [auth B]	Beta-Casp	e9mihB1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
J [auth E]	Beta-Casp	e9mihE1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
F [auth C]	Beta-Casp	e9mihC1	A: beta barrels	X: cradle loop barrel	H: RIFT-related	T: acid protease	F: Beta-Casp	ECOD (v294.2)
B [auth A]	Beta-Casp	e9mihA1	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
D [auth G], H [auth J], L [auth M]	Heavy Chain	IGHV3	-	envelope glycoprotein gp160, envelope glycoprotein gp160 \| hiv-1 envelope glycoprotein bg505 sosip.664 gp120	SAbDab (2026-06-05)
N [auth H]	Heavy Chain	IGHV1	-	hiv-1 envelope glycoprotein bg505 sosip.664 gp120	SAbDab (2026-06-05)
E [auth I], I [auth K], M [auth N]	Light Chain	IGLV2	Lambda	envelope glycoprotein gp160, envelope glycoprotein gp160 \| hiv-1 envelope glycoprotein bg505 sosip.664 gp120	SAbDab (2026-06-05)
A [auth L]	Light Chain	IGKV1	Kappa	hiv-1 envelope glycoprotein bg505 sosip.664 gp120	SAbDab (2026-06-05)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
D [auth G], H [auth J], L [auth M]	RM20A3 heavy chain Fv	-	-	-
N [auth H]	273-4D01 heavy chain Fv	-	-	-
E [auth I], I [auth K], M [auth N]	RM20A3 light chain Fv	-	-	-
C [auth B], G [auth D], K [auth F]	Envelope glycoprotein gp160	structural molecule activity	viral process 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 symbiont entry into host cell symbiont entry into host	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
B [auth A], F [auth C], J [auth E]	HIV-1 Envelope Glycoprotein BG505 SOSIP.664 gp120	structural molecule activity identical protein binding protein binding binding	viral process fusion of virus membrane with host endosome membrane membrane fusion involved in viral entry into host cell membrane organization cellular component organization membrane fusion fusion of virus membrane with host plasma membrane cellular process cellular component organization or biogenesis regulation of localization regulation of biological process cellular localization regulation of cellular process regulation of protein localization viral process fusion of virus membrane with host endosome membrane membrane fusion involved in viral entry into host cell membrane organization cellular component organization membrane fusion fusion of virus membrane with host plasma membrane cellular process cellular component organization or biogenesis regulation of localization regulation of biological process cellular localization regulation of cellular process regulation of protein localization positive regulation of receptor clustering biological regulation positive regulation of biological process positive regulation of protein localization to membrane localization within membrane protein localization to membrane localization regulation of cellular localization macromolecule localization receptor clustering positive regulation of protein localization intracellular protein localization regulation of receptor clustering regulation of protein localization to membrane positive regulation of cellular process 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 plasma membrane raft distribution regulation of cellular component organization positive regulation of cellular component organization plasma membrane raft polarization plasma membrane organization membrane raft organization endomembrane system organization membrane raft distribution plasma membrane raft localization membrane raft polarization regulation of plasma membrane raft polarization membrane raft localization regulation of plasma membrane organization positive regulation of plasma membrane raft polarization import into cell receptor-mediated endocytosis of virus by host cell transport establishment of localization vesicle-mediated transport symbiont entry into host cell clathrin-dependent endocytosis symbiont entry into host clathrin-dependent endocytosis of virus by host cell receptor-mediated endocytosis endocytosis endocytosis involved in viral entry into host cell viral gene expression viral protein processing symbiont-mediated perturbation of host defense response symbiont-mediated perturbation of host process modulation of process of another organism	cellular anatomical structure membrane virion component virion membrane host intracellular membrane-bounded organelle host cellular component host intracellular part host cell membrane other organism part host cell cytoplasm part host intracellular organelle host cell endosome membrane host cell cytoplasm host cell part cellular anatomical structure membrane virion component virion membrane host intracellular membrane-bounded organelle host cellular component host intracellular part host cell membrane other organism part host cell cytoplasm part host intracellular organelle host cell endosome membrane host cell cytoplasm host cell part host cell endosome host intracellular region viral membrane viral envelope host cell plasma membrane
A [auth L]	273-4D01 kappa chain Fv	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
C [auth B], G [auth D], K [auth F]	IPR000777	Human immunodeficiency virus 1, envelope glycoprotein Gp120	Domain
C [auth B], G [auth D], K [auth F]	IPR036377	Gp120 core superfamily	Homologous Superfamily
C [auth B], G [auth D], K [auth F]	IPR000328	Retroviral envelope protein GP41-like	Domain
B [auth A], F [auth C], J [auth E]	IPR000777	Human immunodeficiency virus 1, envelope glycoprotein Gp120	Domain
B [auth A], F [auth C], J [auth E]	IPR036377	Gp120 core superfamily	Homologous Superfamily
B [auth A], F [auth C], J [auth E]	IPR000328	Retroviral envelope protein GP41-like	Domain
B [auth A], F [auth C], J [auth E]	IPR037527	Envelope glycoprotein Gp160	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.