Diversification of the RAB Guanosine Triphosphatase Family in Dicots and Monocots

作     者：Jiaming Zhang Daniel R. Hill Anne W. Sylvester 

作者机构：State Key Biotechnology Laboratory for Tropical Crops Institute of Tropical Bioscience and Biotechnology Chinese Academy of Tropical Agricultural Sciences Haikou 571101 China Department of Molecular Biology 3994 1000 East University Ave. University of Wyoming Laramie Wyoming 82071 USA 

出 版 物：《Journal of Integrative Plant Biology》 (植物学报（英文版）)

年 卷 期：2007年第49卷第8期

页      面：1129-1141页

核心收录：

学科分类：0710[理学-生物学] 071001[理学-植物学] 07[理学] 0901[农学-作物学] 0703[理学-化学] 0902[农学-园艺学] 

基　　金：Supported by the National Natural Science Foundation of China(30260062)to Jiaming Zhang the US Department of Energy,Division of Energy Biosciences(PR 03-00ER15098.00) US Department of Agriculture-NRI(2001-35304-09899) National Science Foundation-Plant Genome Research Program DBI#0501862 to Anne Sylvester 

主　　题：dicot GTP binding protein monocot phylogenetic analysis RAB guanosine triphosphatase 

摘      要：RAB guanosine triphosphatases （GTPases） are key regulators of vesicle trafficking and are essential to the growth and development of all eukaryotic cells. During evolution, the RAB family has expanded in different patterns to facilitate distinct cellular, developmental and physiological adaptations. Yeast has only 11 family members, whereas mammalian RABs have expanded to 18 RAB subfamilies. Plant RABs have diversified primarily by duplicating members within a single subfamily. Plant RABs are divided into eight subfamilies, corresponding to mammalian RAB1, RAB2, RAB5, RAB6, RAB7, RAB8, RAB11 and RAB18. Functional diversification of these is exemplified by the RAB1 ls, orthologs of which are partitioned 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 determined by analysis of over-expression mutants. We propose that dicots and monocots have also diverged in their RAB profiles to accommodate unique cellular functions between the two groups. Here we present a bioinformatics analysis comparing the RAB sub-families of rice, maize and Arabidopsis. These results will guide future functional studies to test for the role of diversification of subfamilies unique to monocots compared to dicots.