Annotations: 1U57

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.20.5.760	Mainly Alpha	Up-down Bundle	Single alpha-helices involved in coiled-coils or other helix-helix interfaces	Single helix bin	CATH (4.3.0)

Chains	Accession	Name	Description	Comments	Source
A	PF19317	Gag protein p24 C-terminal domain (Gag_p24_C)	Gag protein p24 C-terminal domain	p24 forms inner protein layer of the nucleocapsid. ELISA tests for p24 is the most commonly used method to demonstrate virus replication both in vivo and in vitro.	Domain
A	PF00098	Zinc knuckle (zf-CCHC)	Zinc knuckle	The zinc knuckle is a zinc binding motif composed of the the following CX2CX4HX4C where X can be any amino acid. The motifs are mostly from retroviral gag proteins (nucleocapsid). Prototype structure is from HIV. Also contains members involved in eu ...	The zinc knuckle is a zinc binding motif composed of the the following CX2CX4HX4C where X can be any amino acid. The motifs are mostly from retroviral gag proteins (nucleocapsid). Prototype structure is from HIV. Also contains members involved in eukaryotic gene regulation, such as C. elegans GLH-1. Structure is an 18-residue zinc finger.	Domain

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Gag polyprotein	structural molecule activity cation binding transition metal ion binding zinc ion binding ion binding binding metal ion binding small molecule binding RNA binding organic cyclic compound binding nucleic acid binding	virion assembly viral process viral budding viral budding via host ESCRT complex viral life cycle	host intracellular membrane-bounded organelle host cellular component host intracellular part host multivesicular body cellular anatomical entity host cell cytoplasm part host intracellular organelle host cell cytoplasm host cell part host cell late endosome host cell endosome host intracellular region membrane virion component host intracellular membrane-bounded organelle host cellular component host intracellular part host multivesicular body cellular anatomical entity host cell cytoplasm part host intracellular organelle host cell cytoplasm host cell part host cell late endosome host cell endosome host intracellular region membrane virion component virion membrane host cell nucleus host cell plasma membrane host cell membrane viral nucleocapsid viral capsid

Chains	Accession	Name	Type
A	IPR000071	Immunodeficiency lentiviral matrix, N-terminal	Domain
A	IPR045345	Retroviral nucleocapsid Gag protein p24, C-terminal domain	Domain
A	IPR036875	Zinc finger, CCHC-type superfamily	Homologous Superfamily
A	IPR001878	Zinc finger, CCHC-type	Domain
A	IPR008919	Retrovirus capsid, N-terminal	Homologous Superfamily
A	IPR010999	Retroviral matrix protein	Homologous Superfamily
A	IPR012344	Matrix protein, lentiviral and alpha-retroviral, N-terminal	Homologous Superfamily
A	IPR014817	Gag protein p6	Domain
A	IPR008916	Retrovirus capsid, C-terminal	Homologous Superfamily