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IST1 homolog (charged multivesicular body protein 8) (IST1)

Target: IST1
Molecular classification: ESCRT-III complex component (Endosomal Sorting Complex Required for Transport-III), Membrane remodeling factor, Cytoskeletal regulator, Other (not an enzyme, receptor, or transporter)

Overview

IST1 homolog (charged multivesicular body protein 8, CHMP8) is a versatile ESCRT-III-associated protein that orchestrates membrane remodeling events required for cytokinesis, nuclear envelope reassembly, and endosomal trafficking[4][1][5]. IST1 interacts with core ESCRT-III components and ATPase regulator Vps4, forming higher-order filaments and complexes that induce membrane fission during cell division and vesicular sorting[3][7]. Its function safeguards genome integrity, maintains cellular homeostasis, and is linked to cytoskeletal dynamics. IST1 is conserved across eukaryotes, localizes to the cytoplasm and midbody during division, and is overexpressed in certain cancers such as lung cancer[1]. While not currently a direct drug target, IST1’s dysfunction can impair cell division and is of interest for cancer and cell biology research.

Other names: CHMP8Charged multivesicular body protein 8Increased sodium tolerance 1 homologOverexpressed in lung cancer 1 (OLC1)Putative MAPK-activating protein PM28IST1 factor associated with ESCRT-IIIKIAA0174hIST1ESCRT-III-associated factor

Mechanism of action

No drugs currently target IST1 directly. Mechanistically, IST1 regulates Vps4 ATPase recruitment and ESCRT-III assembly/disassembly, influencing membrane fission events.

Biological functions

Cytokinesis (midbody abscission during cell division)Nuclear envelope reassemblyEndosomal tubulation and multivesicular body (MVB) traffickingSafeguarding genome integrity by membrane sealingRegulation of Vps4 ATPase activity in concert with other ESCRT-III proteins (Did2/CHMP1B, CHMP1, AKTIP, Spartin)

Disease associations

Cancer (overexpressed in some lung cancers; OLC1 alias)Possible roles in viral budding, although IST1 is not needed for all virus budding processesCell division disorders (depletion causes cytokinesis arrest, multinuclear cells)No strong evidence for roles in inflammation, neurodegeneration, cardiovascular disease, or infection outside basic membrane trafficking dysfunction.

Safety considerations

Knockdown leads to cytokinesis arrest and multinuclear cells (possible implications for cell viability and genome stability)Overexpression interferes with endosomal trafficking and membrane remodelingNo known clinical safety issues due to lack of direct pharmacological targeting.

Biomarkers

Overexpressed in lung cancer cells (OLC1), suggesting potential as a biomarker for some tumor types. No known validated biomarker panel for patient selection or efficacy monitoring involving IST1.

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