Isolation of a novel human gene, ARHGAP9, encoding a Rho-GTPase activatingprotein

Citation
Y. Furukawa et al., Isolation of a novel human gene, ARHGAP9, encoding a Rho-GTPase activatingprotein, BIOC BIOP R, 284(3), 2001, pp. 643-647
Citations number
50
Categorie Soggetti
Biochemistry & Biophysics
Journal title
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
ISSN journal
0006291X → ACNP
Volume
284
Issue
3
Year of publication
2001
Pages
643 - 647
Database
ISI
SICI code
0006-291X(20010615)284:3<643:IOANHG>2.0.ZU;2-U
Abstract
Members of the Rho family of small guanosine triphosphatases (Rho-GTPases) have emerged as key coordinators of signaling pathways leading to remodelin g of the actin cytoskeleton, a process that plays a critical role in cell a dhesion and migration. However, the precise regulatory mechanisms remain to be elucidated. Here we report isolation of a novel human gene, ARHGAP9, wh ich encodes a protein containing a Rho-GTPase activating protein (Rho-GAP) domain, a src-homology 3 (SH3) domain, a pleckstrin homology (PH) region, a nd a WW domain. In vitro, the recombinant protein revealed substantial GAP activity toward Cdc42Hs and Rac1, and less toward RhoA. The transcript was predominantly expressed in peripheral blood leukocytes, spleen, and thymus. Exogenous expression of the entire coding region of ARHGAP9 into human leu kemia KG-1 cells repressed adhesion of the cells to fibronectin and collage n IV. Our results indicate that ARHGAP9 is involved in regulating adhesion of hematopoietic cells to extracellular matrix. (C) 2001 Academic Press.