Annotations: 1QBZ

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1qbza_	Coiled coil proteins	Stalk segment of viral fusion proteins	Virus ectodomain	Virus ectodomain	Retrovius gp41 protease-resistant core	(Simian immunodeficiency virus ) [TaxId: 11723 ],	SCOPe (2.08)
B	d1qbzb_	Coiled coil proteins	Stalk segment of viral fusion proteins	Virus ectodomain	Virus ectodomain	Retrovius gp41 protease-resistant core	(Simian immunodeficiency virus ) [TaxId: 11723 ],	SCOPe (2.08)
C	d1qbzc_	Coiled coil proteins	Stalk segment of viral fusion proteins	Virus ectodomain	Virus ectodomain	Retrovius gp41 protease-resistant core	(Simian immunodeficiency virus ) [TaxId: 11723 ],	SCOPe (2.08)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	GP41_1st	e1qbzA1	A: a+b duplicates or obligate multimers	X: MPER trimer (From Topology)	H: MPER trimer (From Topology)	T: MPER trimer	F: GP41_1st	ECOD (1.6)
B	GP41_1st	e1qbzB1	A: a+b duplicates or obligate multimers	X: MPER trimer (From Topology)	H: MPER trimer (From Topology)	T: MPER trimer	F: GP41_1st	ECOD (1.6)
C	GP41_1st	e1qbzC1	A: a+b duplicates or obligate multimers	X: MPER trimer (From Topology)	H: MPER trimer (From Topology)	T: MPER trimer	F: GP41_1st	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.287.210	Mainly Alpha	Orthogonal Bundle	Helix Hairpins		CATH (4.3.0)
B	1.10.287.210	Mainly Alpha	Orthogonal Bundle	Helix Hairpins		CATH (4.3.0)
C	1.10.287.210	Mainly Alpha	Orthogonal Bundle	Helix Hairpins		CATH (4.3.0)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C	PROTEIN (SIV GP41 ECTODOMAIN)	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 cellular anatomical structure membrane host cell plasma membrane host cellular component host cell part host cell membrane virion membrane host intracellular membrane-bounded organelle host intracellular part host cell cytoplasm part host intracellular organelle virion component viral membrane viral envelope cellular anatomical structure membrane host cell plasma membrane host cellular component host cell part host cell membrane 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, B, C	IPR000777	Human immunodeficiency virus 1, envelope glycoprotein Gp120	Domain
A, B, C	IPR036377	Gp120 core superfamily	Homologous Superfamily
A, B, C	IPR000328	Retroviral envelope protein GP41-like	Domain

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.