title: A PP2A regulatory subunit positively regulates Ras-mediated signaling during Caenorhabditis elegans vulval induction.
abstract: We describe evidence that a regulatory B subunit of protein phosphatase 2A (PP2A) positively regulates an RTK-Ras-MAP kinase signaling cascade during Caenorhabditis elegans vulval induction. Although reduction of sur-6 PP2A-B function causes few vulval induction defects in an otherwise wild-type background, sur-6 PP2A-B mutations suppress the Multivulva phenotype of an activated ras mutation and enhance the Vulvaless phenotype of mutations in lin-45 raf, sur-8, or mpk-1. Double mutant analysis suggests that sur-6 PP2A-B acts downstream or in parallel to ras, but likely upstream of raf, and functions with ksr-1 in a common pathway to positively regulate Ras signaling.
authors.affiliation: Howard Hughes Medical Institute, Department of Molecular, Cellular, and Developmental Biology, University of Colorado at Boulder, Boulder, Colorado 80309-0347, USA.
authors.forename: D S
authors.initials: DS
authors.lastname: Sieburth
authors.forename: M
authors.initials: M
authors.lastname: Sundaram
authors.forename: R M
authors.initials: RM
authors.lastname: Howard
authors.forename: M
authors.initials: M
authors.lastname: Han
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D017173:Caenorhabditis elegans / Q000196:embryology; D029742:Caenorhabditis elegans Proteins; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism; D018509:DNA, Helminth; D004627:Embryonic Induction; D005260:Female; D015801:Helminth Proteins / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D008969:Molecular Sequence Data; D010749:Phosphoprotein Phosphatases / Q000235:genetics / Q000378:metabolism*; D011494:Protein Kinases / Q000235:genetics / Q000378:metabolism; D054648:Protein Phosphatase 2; D017386:Sequence Homology, Amino Acid; D015398:Signal Transduction; D014844:Vulva / Q000196:embryology*; D018631:ras Proteins / Q000378:metabolism*
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D029742:Caenorhabditis elegans Proteins; D002352:Carrier Proteins; D018509:DNA, Helminth; D015801:Helminth Proteins; C113520:soc-2 protein, C elegans; D011494:Protein Kinases; C097199:KSR-1 protein kinase; D010749:Phosphoprotein Phosphatases; D054648:Protein Phosphatase 2; D018631:ras Proteins