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Diversification of the RAB Guanosine Triphosphatase Family in Dicots and Monocots

文献类型： 外文期刊

作者： Zhang, Jiaming 1 ; Hill, Daniel R. 2 ; Sylvester, Anne W. 2 ;

作者机构： 1.Univ Wyoming, Dept Mol Biol, Laramie, WY 82071 USA

2.Univ Wyoming, Dept Mol Biol, Laramie, WY 82071 USA; Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, State Key Lab Trop Crops, Haikou 571101, Peoples R China

关键词： dicot;GTP binding protein;monocot;phylogenetic analysis;RAB guanosine triphosphatase

期刊名称：JOURNAL OF INTEGRATIVE PLANT BIOLOGY （ 影响因子：7.061； 五年影响因子：6.002 ）

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收录情况： SCI

摘要： RAB guanosine triphosphatases (GTPases) are key regulators of vesicle trafficking and are essential to the growth anddevelopment of all eukaryotic cells. During evolution, the RAB family has expanded in different patterns to facilitatedistinct cellular, developmental and physiological adaptations. Yeast has only 11 family members, whereas mammalianRABs have expanded to 18 RAB subfamilies. Plant RABs have diversified primarily by duplicating members within asingle subfamily. Plant RABs are divided into eight subfamilies, corresponding to mammalian RAB1, RAB2, RABS, RAB6,RAB7, RABS, RAB11 and RAB18. Functional diversification of these is exemplified by the RAB11s, orthologs of which arepartitioned into unique cell compartments in plants where they function to transport vesicles during localized tip growth.Similarly, the RAB2 family in grasses is likely involved in vesicle secretion associated with wall expansion, as determinedby analysis of over-expression mutants. We propose that dicots and monocots have also diverged in their RAB profiles toaccommodate unique cellular functions between the two groups. Here we present a bioinformatics analysis comparing theRAB sub-families of rice, maize and Arabidopsis. These results will guide future functional studies to test for the role ofdiversification of subfamilies unique to monocots compared to dicots.

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