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The Ras superfamily is a protein superfamily of small GTPases, which are all related, to a degree, to the Ras protein subfamily (the key human members of which are KRAS, NRAS, and HRAS). There are more than a hundred proteins in the Ras superfamily. Based on structure, sequence and function, the Ras superfamily is divided into five main families (Ras, Rho, Ran, Rab and Arf GTPases). The Ras family itself is further divided into 6 subfamilies: Ras, Ral, Rit, Rap, Rheb, Rad and ''Rit''. ''Miro'' is a recent contributor to the superfamily. Each subfamily shares the common core G domain, which provides essential GTPase and nucleotide exchange activity. The surrounding sequence helps determine the functional specificity of the small GTPase, for example the 'Insert Loop', common to the Rho subfamily, specifically contributes to binding to effector proteins such as WASP. In general, the Ras family is responsible for cell proliferation: Rho for cell morphology, Ran for nuclear transport, and Rab and Arf for vesicle transport.〔 ==Subfamilies and members== The following is a list of human proteins belonging to the Ras superfamily:〔 Unclassified: * ARHGAP5 * DNAJC27 * GRLF1 * RASEF 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「ras superfamily」の詳細全文を読む スポンサード リンク
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