VPS4A Antibody – Rabbit Polyclonal

The protein encoded by this gene is a member of the AAA protein family (ATPases associated with diverse cellular activities), and is the homolog of the yeast Vps4 protein. In humans, two paralogs of the yeast protein have been identified. The former share a high degree of aa sequence similarity with each other, and also with yeast Vps4 and mouse Skd1 proteins. The mouse Skd1 (suppressor of K+ transport defect 1) has been shown to be really an yeast Vps4 ortholog. Functional studies indicate that both human paralogs associate with the endosomal compartments, and are involved in intracellular protein trafficking, similar to Vps4 protein in yeast. The gene encoding this paralog has been mapped to chromosome 16; the gene for the other resides on chromosome 18. [provided by RefSeq, Jul 2008]

VPS4A: Involved in late steps of the endosomal multivesicular bodies (MVB) pathway. Recognizes membrane-associated ESCRT-III assemblies and catalyzes their disassembly, possibly in combination with membrane fission. Redistributes the ESCRT-III components to the cytoplasm for further rounds of MVB sorting. MVBs contain intraluminal vesicles (ILVs) that are generated by invagination and scission from the limiting membrane of the endosome and mostly are delivered to lysosomes enabling degradation of membrane proteins, such as stimulated growth factor receptors, lysosomal enzymes and lipids. In conjunction with the ESCRT machinery also appears to function in topologically equivalent membrane fission events, such as the terminal stages of cytokinesis and enveloped virus budding (HIV-1 and other lentiviruses). Involved in cytokinesis. Belongs to the AAA ATPase family.

Protein type: EC 3.6.4.6; Vesicle

Chromosomal Location of Human Ortholog: 16q22.1

Cellular Component: spindle pole; centrosome; late endosome membrane; perinuclear region of cytoplasm; cytoplasm; midbody; cytosol; nucleus

Molecular Function: protein C-terminus binding; protein domain specific binding; protein binding; ATPase activity, coupled; microtubule-severing ATPase activity; ATP binding

Biological Process: ubiquitin-dependent protein catabolic process via the multivesicular body pathway; cell separation during cytokinesis; viral reproduction; cytokinesis; viral infectious cycle; endosome transport; mitotic metaphase plate congression; negative regulation of cytokinesis; cytoplasmic microtubule organization and biogenesis; vesicle-mediated transport; protein transport; abscission; nuclear organization and biogenesis; vacuole organization and biogenesis