Werner L A, Manseau L J
Department of Molecular and Cellular Biology, University of Arizona, Tucson 85721, USA.
Gene. 1997 Mar 10;187(1):107-14. doi: 10.1016/s0378-1119(96)00732-9.
We have identified a Drosophila gene that has substantial sequence homology to a distinct class of proto-oncogenes that includes DBL, VAV, Tiam-1, ost and ect-2. It has predicted Rho or Rac guanine exchange factor (Rho/RacGEF) and pleckstin homology (PH) domains with the PH immediately downstream of the Rho/RacGEF. Rho/RacGEFs catalyze the dissociation of GDP from the Rho/Rac subfamily of Ras-like GTPases, thus activating the target Rho/Rac (Takai et al. (1995) Trends Biochem. Sci. 20, 227-231]. Members of the Rho/Rac subfamily regulate organization of the actin cytoskeleton, which controls the morphology, adhesion and motility of cells (Nobes et al. (1995) J. Cell Sci. 108, 225 233; Ridley and Hall (1992) Cell 70, 389-399; Ridley et al. (1992) Cell 70, 401-410]. Message from this gene is found throughout oogenesis and embryogenesis. Of particular interest, message is most abundant in furrows and folds of the embryo where cell shapes are changing and the cytoskeleton is likely to be undergoing reorganization.
我们已经鉴定出一个果蝇基因,它与一类独特的原癌基因具有高度的序列同源性,这类原癌基因包括DBL、VAV、Tiam-1、ost和ect-2。该基因预测具有Rho或Rac鸟嘌呤交换因子(Rho/RacGEF)以及普列克底物蛋白同源(PH)结构域,其中PH结构域紧邻Rho/RacGEF下游。Rho/RacGEF催化GDP从Ras样GTP酶的Rho/Rac亚家族上解离,从而激活靶标Rho/Rac(Takai等人,《生物化学趋势》,1995年,第20卷,第227 - 231页)。Rho/Rac亚家族的成员调节肌动蛋白细胞骨架的组织,而肌动蛋白细胞骨架控制细胞的形态、黏附及运动(Nobes等人,《细胞科学杂志》,1995年,第108卷,第225 - 233页;Ridley和Hall,《细胞》,1992年,第70卷,第389 - 399页;Ridley等人,《细胞》,1992年,第70卷,第401 - 410页)。该基因的信使核糖核酸在整个卵子发生和胚胎发生过程中都能被发现。特别有趣的是,信使核糖核酸在胚胎的沟和褶皱中最为丰富,而这些部位细胞形状正在发生变化,细胞骨架可能正在经历重组。