Modulation of Cell Proliferation by Heterotrimeric G Protein in Arabidopsis

0301 basic medicine Indoleacetic Acids Light Arabidopsis Proteins MAP Kinase Signaling System Arabidopsis Genes, Plant Heterotrimeric GTP-Binding Proteins GTP-Binding Protein alpha Subunits Plant Leaves 03 medical and health sciences Phenotype Genes, Reporter Mutation Morphogenesis Intercellular Signaling Peptides and Proteins Guanosine Triphosphate 2,4-Dichlorophenoxyacetic Acid Peptides Alleles Cell Size Glucuronidase
DOI: 10.1126/science.1059040 Publication Date: 2002-07-27T09:52:41Z
ABSTRACT
The α subunit of a prototypical heterotrimeric GTP-binding protein (G protein), which is encoded by a single gene ( GPA1 ) in Arabidopsis , is a modulator of plant cell proliferation. gpa1 null mutants have reduced cell division in aerial tissues throughout development. Inducible overexpression of GPA1 in Arabidopsis confers inducible ectopic cell division. GPA1 overexpression in synchronized BY-2 cells causes premature advance of the nuclear cycle and the premature appearance of a division wall. Results from loss of function and ectopic expression and activation of GPA1 indicate that this subunit is a positive modulator of cell division in plants.
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