Annotations: 3FRS

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	IST1/CHMP3-like	8055735	3002301	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)
A	Ist1	e3frsA1	A: alpha bundles	X: Charged multivesicular body protein 3 (CHMP3)-related (From Topology)	H: Charged multivesicular body protein 3 (CHMP3)-related (From Topology)	T: Charged multivesicular body protein 3 (CHMP3)-related	F: Ist1	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.20.1260.60	Mainly Alpha	Up-down Bundle	Ferritin	Vacuolar protein sorting-associated protein Ist1	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF03398	Regulator of Vps4 activity in the MVB pathway (Ist1)	Regulator of Vps4 activity in the MVB pathway	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	Uncharacterized protein KIAA0174	protein binding binding protein domain specific binding MIT domain binding cell adhesion molecule binding cadherin binding protein-containing complex binding identical protein binding	viral process viral capsid secondary envelopment cytoskeleton-dependent cytokinesis cellular process cytokinesis cell division cell cycle cell cycle process protein localization localization cellular localization cellular macromolecule localization macromolecule localization establishment of protein localization viral process viral capsid secondary envelopment cytoskeleton-dependent cytokinesis cellular process cytokinesis cell division cell cycle cell cycle process protein localization localization cellular localization cellular macromolecule localization macromolecule localization establishment of protein localization establishment of localization organelle assembly multivesicular body assembly vesicle organization cellular component organization cellular component biogenesis organelle organization cellular component assembly multivesicular body organization endosome organization cellular component organization or biogenesis endomembrane system organization nitrogen compound transport transport organic substance transport protein transport multicellular organismal process axonogenesis cellular developmental process developmental growth cell projection organization plasma membrane bounded cell projection morphogenesis cell development neuron projection development cell growth cell morphogenesis neurogenesis multicellular organism development cell projection morphogenesis neuron differentiation neuron projection morphogenesis cell differentiation anatomical structure development system development developmental process collateral sprouting plasma membrane bounded cell projection organization developmental cell growth growth nervous system development axon development cell morphogenesis involved in neuron differentiation developmental growth involved in morphogenesis generation of neurons anatomical structure morphogenesis neuron development regulation of biological process organonitrogen compound metabolic process positive regulation of protein metabolic process regulation of protein metabolic process biological regulation positive regulation of biological process primary metabolic process regulation of macromolecule metabolic process regulation of primary metabolic process positive regulation of metabolic process organic substance metabolic process regulation of proteolysis proteolysis positive regulation of proteolysis metabolic process positive regulation of macromolecule metabolic process protein metabolic process macromolecule metabolic process regulation of metabolic process exit from host cell biological process involved in interspecies interaction between organisms viral release from host cell viral life cycle biological process involved in interaction with host biological process involved in symbiotic interaction positive regulation of nervous system development regulation of growth regulation of cellular process regulation of cellular component size regulation of cell differentiation regulation of neurogenesis regulation of cell development positive regulation of developmental process positive regulation of cell projection organization regulation of biological quality positive regulation of developmental growth positive regulation of collateral sprouting regulation of cell projection organization positive regulation of cell development positive regulation of multicellular organismal process regulation of neuron projection development regulation of collateral sprouting regulation of cellular component organization positive regulation of cellular component organization regulation of developmental process regulation of nervous system development regulation of extent of cell growth positive regulation of cell differentiation regulation of axonogenesis positive regulation of neurogenesis regulation of multicellular organismal process positive regulation of cellular process regulation of anatomical structure morphogenesis positive regulation of axonogenesis regulation of cell size regulation of multicellular organismal development regulation of developmental growth positive regulation of cell growth regulation of cell growth positive regulation of growth regulation of plasma membrane bounded cell projection organization regulation of anatomical structure size abscission cellular component disassembly protein-containing complex organization protein-containing complex disassembly ESCRT III complex disassembly ESCRT complex disassembly	midbody cellular anatomical entity membrane-bounded organelle intracellular organelle organelle envelope intracellular anatomical structure organelle nuclear envelope nucleus intracellular membrane-bounded organelle endomembrane system extracellular exosome extracellular vesicle extracellular organelle midbody cellular anatomical entity membrane-bounded organelle intracellular organelle organelle envelope intracellular anatomical structure organelle nuclear envelope nucleus intracellular membrane-bounded organelle endomembrane system extracellular exosome extracellular vesicle extracellular organelle extracellular region extracellular space vesicle extracellular membrane-bounded organelle centrosome microtubule organizing center cytoskeleton intracellular non-membrane-bounded organelle microtubule cytoskeleton non-membrane-bounded organelle cytoplasm cytosol lytic vacuole intracellular vesicle membrane-enclosed lumen cytoplasmic vesicle lumen vacuolar lumen intracellular organelle lumen cytoplasmic vesicle lysosome vesicle lumen azurophil granule vacuole secretory granule lumen azurophil granule lumen organelle lumen secretory granule primary lysosome secretory vesicle protein-containing complex protein-DNA complex chromatin chromosome Flemming body endoplasmic reticulum-Golgi intermediate compartment

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR005061	Vacuolar protein sorting-associated protein Ist1	Family
A	IPR042277	Vacuolar protein sorting-associated protein IST1-like	Homologous Superfamily

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	Pharos: P53990	astrocytic tumor large cell medulloblastoma breast carcinoma osteosarcoma glioblastoma ovarian cancer

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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 R01GM133198.