Annotations: 4YBL

Crystal structure of the stabilized inner domain of clade A/E HIV-1 gp120 in complex with the ADCC mediating ANTI-HIV-1 antibody A32

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
IMGT Antibody Annotation
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
B [auth H]	d4yblh1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
B [auth H]	d4yblh2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
E [auth B]	d4yblb1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
E [auth B]	d4yblb2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
C [auth L]	d4ybll2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
C [auth L]	d4ybll1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
F [auth C]	d4yblc2	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	C1 set domains (antibody constant domain-like)	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)
F [auth C]	d4yblc1	All beta proteins	Immunoglobulin-like beta-sandwich	Immunoglobulin	automated matches	automated matches	(Homo sapiens ) [TaxId: 9606 ],	SCOPe (2.08)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B [auth H]	LRR_1+LRR_8+LRR_14	e4yblH1	A: alpha arrays	X: Repetitive alpha hairpins	H: ARM repeat	T: ARM repeat	F: LRR_1+LRR_8+LRR_14	ECOD (v295.2)
E [auth B]	LRR_1+LRR_8+LRR_14	e4yblB1	A: alpha arrays	X: Repetitive alpha hairpins	H: ARM repeat	T: ARM repeat	F: LRR_1+LRR_8+LRR_14	ECOD (v295.2)
C [auth L]	LRR_1+LRR_8+LRR_14	e4yblL1	A: alpha arrays	X: Repetitive alpha hairpins	H: ARM repeat	T: ARM repeat	F: LRR_1+LRR_8+LRR_14	ECOD (v295.2)
F [auth C]	LRR_1+LRR_8+LRR_14	e4yblC1	A: alpha arrays	X: Repetitive alpha hairpins	H: ARM repeat	T: ARM repeat	F: LRR_1+LRR_8+LRR_14	ECOD (v295.2)
A [auth G]	MG491_central	e4yblG1	A: alpha arrays	X: Spectrin repeat-like	H: Organelle protein MG491 central domain	T: Organelle protein MG491 central domain	F: MG491_central	ECOD (v295.2)
D [auth A]	MG491_central	e4yblA1	A: alpha arrays	X: Spectrin repeat-like	H: Organelle protein MG491 central domain	T: Organelle protein MG491 central domain	F: MG491_central	ECOD (v295.2)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B [auth H]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
E [auth B]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
C [auth L]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)
F [auth C]	2.60.40.10	Mainly Beta	Sandwich	Immunoglobulin-like	Immunoglobulins	CATH (4.3.0)

IMGT Antibody Annotation IMGT Database Homepage

Chain	Protein Name	Description	Organism Name	Gene Allele Name(s)	Domain Name(s)	Receptor Type	Receptor Description	Provenance Source
B [auth H], E [auth B]	A32 Fab	VH-CH1	Homo sapiens (human)	IGHV4-30-401, IGHV4-3102, IGHV4-3103, IGHJ302, IGHG1*03	V-DOMAIN VH, C-DOMAIN CH1	IG	FAB-GAMMA-1_LAMBDA	IMGT (202632-0)
C [auth L], F [auth C]	A32 Fab	L-LAMBDA	Homo sapiens (human)	IGLV2-801, IGLJ201, IGLJ302, IGLJ301, IGLC201, IGLC202, IGLC3*04	V-DOMAIN V-LAMBDA, C-DOMAIN C-LAMBDA	IG	FAB-GAMMA-1_LAMBDA	IMGT (202632-0)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B [auth H], E [auth B]	Heavy Chain	IGHV4	-	stabilized inner domain of clade a/e gp120	SAbDab (2026-08-21)
C [auth L], F [auth C]	Light Chain	IGLV2	Lambda	stabilized inner domain of clade a/e gp120	SAbDab (2026-08-21)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
B [auth H], E [auth B]	A32 antibody Fab heavy chain	-	-	-
C [auth L], F [auth C]	A32 antibody light chain	-	-	-
A [auth G], D [auth A]	Stabilized inner domain of clade A/E gp120	-	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	virion component viral membrane viral envelope virion membrane

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth G], D [auth A]	IPR000777	Human immunodeficiency virus 1, envelope glycoprotein Gp120	Domain
A [auth G], D [auth A]	IPR036377	Gp120 core superfamily	Homologous Superfamily

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