2xze

Structural highlights

Function

[CHMP3_HUMAN] Probable core component of the endosomal sorting required for transport complex III (ESCRT-III) which is involved in multivesicular bodies (MVBs) formation and sorting of endosomal cargo proteins into MVBs. 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. The MVB pathway appears to require the sequential function of ESCRT-O, -I,-II and -III complexes. ESCRT-III proteins mostly dissociate from the invaginating membrane before the ILV is released. The ESCRT machinery also functions in topologically equivalent membrane fission events, such as the terminal stages of cytokinesis and the budding of enveloped viruses (HIV-1 and other lentiviruses). ESCRT-III proteins are believed to mediate the necessary vesicle extrusion and/or membrane fission activities, possibly in conjunction with the AAA ATPase VPS4. Selectively binds to phosphatidylinositol 3,5-bisphosphate PtdIns(3,5)P2 and PtdIns(3,4)P2 in preference to other phosphoinositides tested. Involved in late stages of cytokinesis. Plays a role in endosomal sorting/trafficking of EGF receptor. Isoform 2 prevents stress-mediated cell death and accumulation of reactive oxygen species when expressed in yeast cells.^{[1] [2] [3] [4] [5]}

See Also

• ATPase

References

1. ↑ Yan Q, Hunt PR, Frelin L, Vida TA, Pevsner J, Bean AJ. mVps24p functions in EGF receptor sorting/trafficking from the early endosome. Exp Cell Res. 2005 Mar 10;304(1):265-73. Epub 2004 Dec 1. PMID:15707591 doi:10.1016/j.yexcr.2004.11.003
2. ↑ Khoury CM, Yang Z, Ismail S, Greenwood MT. Characterization of a novel alternatively spliced human transcript encoding an N-terminally truncated Vps24 protein that suppresses the effects of Bax in an ESCRT independent manner in yeast. Gene. 2007 Apr 15;391(1-2):233-41. Epub 2007 Jan 26. PMID:17331679 doi:10.1016/j.gene.2006.12.039
3. ↑ von Schwedler UK, Stuchell M, Muller B, Ward DM, Chung HY, Morita E, Wang HE, Davis T, He GP, Cimbora DM, Scott A, Krausslich HG, Kaplan J, Morham SG, Sundquist WI. The protein network of HIV budding. Cell. 2003 Sep 19;114(6):701-13. PMID:14505570
4. ↑ Dukes JD, Richardson JD, Simmons R, Whitley P. A dominant-negative ESCRT-III protein perturbs cytokinesis and trafficking to lysosomes. Biochem J. 2008 Apr 15;411(2):233-9. PMID:18076377 doi:10.1042/BJ20071296
5. ↑ Muziol T, Pineda-Molina E, Ravelli RB, Zamborlini A, Usami Y, Gottlinger H, Weissenhorn W. Structural basis for budding by the ESCRT-III factor CHMP3. Dev Cell. 2006 Jun;10(6):821-30. PMID:16740483 doi:10.1016/j.devcel.2006.03.013
6. ↑ Solomons J, Sabin C, Poudevigne E, Usami Y, Hulsik DL, Macheboeuf P, Hartlieb B, Gottlinger H, Weissenhorn W. Structural Basis for ESCRT-III CHMP3 Recruitment of AMSH. Structure. 2011 Aug 10;19(8):1149-59. PMID:21827950 doi:10.1016/j.str.2011.05.011