title: Evolutionary history of the GH3 family of acyl adenylases in rosids.
abstract: GH3 amino acid conjugases have been identified in many plant and bacterial species. The evolution of GH3 genes in plant species is explored using the sequenced rosids Arabidopsis, papaya, poplar, and grape. Analysis of the sequenced non-rosid eudicots monkey flower and columbine, the monocots maize and rice, as well as spikemoss and moss is included to provide further insight into the origin of GH3 clades. Comparison of co-linear genes in regions surrounding GH3 genes between species helps reconstruct the evolutionary history of the family. Combining analysis of synteny with phylogenetics, gene expression and functional data redefines the Group III GH3 genes, of which AtGH3.12/PBS3, a regulator of stress-induced salicylic acid metabolism and plant defense, is a member. Contrary to previous reports that restrict PBS3 to Arabidopsis and its close relatives, PBS3 syntelogs are identified in poplar, grape, columbine, maize and rice suggesting descent from a common ancestral chromosome dating to before the eudicot/monocot split. In addition, the clade containing PBS3 has undergone a unique expansion in Arabidopsis, with expression patterns for these genes consistent with specialized and evolving stress-responsive functions.
authors: Department of Plant and Microbial Biology, University of California, 221 Koshland Hall, Berkeley, CA 94720, USA.
authors: Rachel A
authors: RA
authors: Okrent
authors: Mary C
authors: MC
authors: Wildermuth
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