UniProt functional annotation for P53990



	UniProt functional annotation for P53990

UniProt code: P53990.

Organism: Homo sapiens (Human).

Taxonomy: Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo.

Function: ESCRT-III-like protein involved in specific functions of the ESCRT machinery. Is required for efficient abscission during cytokinesis, but not for HIV-1 budding. The involvement in the MVB pathway is not established. Involved in recruiting VPS4A and/or VPS4B to the midbody of dividing cells (PubMed:19129479, PubMed:19129480). During late anaphase, involved in nuclear envelope reassembly and mitotic spindle disassembly together with the ESCRT-III complex: IST1 acts by mediating the recruitment of SPAST to the nuclear membrane, leading to microtubule severing (PubMed:26040712). Regulates early endosomal tubulation together with the ESCRT-III complex by mediating the recruitment of SPAST (PubMed:23897888). {ECO:0000269|PubMed:19129479, ECO:0000269|PubMed:19129480, ECO:0000269|PubMed:23897888, ECO:0000269|PubMed:26040712}.

Subunit: Interacts with CHMP1A, CHMP1B, VPS4A and VTA1. Interacts with SPAST, STAMBP, and USP8. May interact with VPS37B. May associate with the ESCRT-I complex. Interacts with MITD1, in competition with VSP4 (PubMed:23015756). Interacts with SPART (via MIT domain); leading to the recruitment of SPART to midbodies (PubMed:20719964). Interacts with SPAST (PubMed:23897888, PubMed:26040712). {ECO:0000269|PubMed:19129479, ECO:0000269|PubMed:19129480, ECO:0000269|PubMed:20719964, ECO:0000269|PubMed:23015756, ECO:0000269|PubMed:23897888, ECO:0000269|PubMed:26040712}.

Subcellular location: Cytoplasmic vesicle {ECO:0000269|PubMed:19129479, ECO:0000269|PubMed:19129480}. Cytoplasm, cytoskeleton, microtubule organizing center, centrosome {ECO:0000269|PubMed:20719964}. Midbody {ECO:0000269|PubMed:20719964}. Nucleus envelope {ECO:0000269|PubMed:26040712}. Note=Localizes to centrosome and midbody of dividing cells (PubMed:19129480, PubMed:19129479, PubMed:20719964). Colocalized with SPART to the ends of Flemming bodies during cytokinesis (PubMed:20719964). Localizes to the nuclear envelope during late anaphase (PubMed:26040712). {ECO:0000269|PubMed:19129479, ECO:0000269|PubMed:19129480, ECO:0000269|PubMed:20719964, ECO:0000269|PubMed:26040712}.

Similarity: Belongs to the IST1 family. {ECO:0000305}.

Sequence caution: Sequence=BAA11491.2; Type=Erroneous initiation; Note=Extended N-terminus.; Evidence={ECO:0000305};

Annotations taken from UniProtKB at the EBI.


Organism:		Homo sapiens (Human).
Taxonomy:		Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia; Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae; Homo.



Function:		ESCRT-III-like protein involved in specific functions of the ESCRT machinery. Is required for efficient abscission during cytokinesis, but not for HIV-1 budding. The involvement in the MVB pathway is not established. Involved in recruiting VPS4A and/or VPS4B to the midbody of dividing cells (PubMed:19129479, PubMed:19129480). During late anaphase, involved in nuclear envelope reassembly and mitotic spindle disassembly together with the ESCRT-III complex: IST1 acts by mediating the recruitment of SPAST to the nuclear membrane, leading to microtubule severing (PubMed:26040712). Regulates early endosomal tubulation together with the ESCRT-III complex by mediating the recruitment of SPAST (PubMed:23897888). {ECO:0000269\|PubMed:19129479, ECO:0000269\|PubMed:19129480, ECO:0000269\|PubMed:23897888, ECO:0000269\|PubMed:26040712}.


Subunit:		Interacts with CHMP1A, CHMP1B, VPS4A and VTA1. Interacts with SPAST, STAMBP, and USP8. May interact with VPS37B. May associate with the ESCRT-I complex. Interacts with MITD1, in competition with VSP4 (PubMed:23015756). Interacts with SPART (via MIT domain); leading to the recruitment of SPART to midbodies (PubMed:20719964). Interacts with SPAST (PubMed:23897888, PubMed:26040712). {ECO:0000269\|PubMed:19129479, ECO:0000269\|PubMed:19129480, ECO:0000269\|PubMed:20719964, ECO:0000269\|PubMed:23015756, ECO:0000269\|PubMed:23897888, ECO:0000269\|PubMed:26040712}.
Subcellular location:		Cytoplasmic vesicle {ECO:0000269\|PubMed:19129479, ECO:0000269\|PubMed:19129480}. Cytoplasm, cytoskeleton, microtubule organizing center, centrosome {ECO:0000269\|PubMed:20719964}. Midbody {ECO:0000269\|PubMed:20719964}. Nucleus envelope {ECO:0000269\|PubMed:26040712}. Note=Localizes to centrosome and midbody of dividing cells (PubMed:19129480, PubMed:19129479, PubMed:20719964). Colocalized with SPART to the ends of Flemming bodies during cytokinesis (PubMed:20719964). Localizes to the nuclear envelope during late anaphase (PubMed:26040712). {ECO:0000269\|PubMed:19129479, ECO:0000269\|PubMed:19129480, ECO:0000269\|PubMed:20719964, ECO:0000269\|PubMed:26040712}.
Similarity:		Belongs to the IST1 family. {ECO:0000305}.
Sequence caution:		Sequence=BAA11491.2; Type=Erroneous initiation; Note=Extended N-terminus.; Evidence={ECO:0000305};