Yeast Crv4/Ttp1, a predicted type II membrane protein, is involved in an event important for growth, functionally overlapping with the event regulated by calcineurin- and Mpk1-mediated pathways.
The Saccharomyces cerevisiae crv mutants (crv1, 2, 3 and 4) exhibit phenotypes, such as calcium resistance and vanadate sensitivity, which are apparently similar to those of calcineurin-deficient mutants. We have cloned and characterized the CRV4 gene that complements all the phenotypes of the crv4 mutant. DNA sequencing revealed that CRV4 is identical to the previously cloned gene TTP1, which encodes a type II membrane protein of unknown function. Deletion of CRV4/TTP1 causes no obvious phenotype except for Ca2+ resistance and vanadate sensitivity, but is synthetically lethal in combination with a deletion of MPK1, in a manner which is suppressible by the addition of an osmotic stabilizer. In medium containing sorbitol as an osmotic stabilizer, the enb1 mpk1 ttp1 triple mutant exhibits a more severe growth defect than does any of the double mutants enb1 ttp1, enb1 mpk1 or mpk1 ttp1. A high Ca2+ concentration (50 mM) or a constitutively active form of calcineurin partially suppresses the growth defect of the mpk1 ttp1 double mutant. These results indicate that Ttp1 participates in a cellular event essential for growth and morphogenesis, in parallel with the pathways involving Mpk1 MAP kinase and calcineurin.
Nakamura
T
T
Department of Molecular Biotechnology, Graduate School of Engineering, Hiroshima University, Japan.
Ohmoto
T
T
Hirata
D
D
Tsuchiya
E
E
Miyakawa
T
T
D019703:Calcineurin / Q000378:metabolism*; D005656:Fungal Proteins / Q000235:genetics / Q000378:metabolism*; D008364:Mannosyltransferases; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D020928:Mitogen-Activated Protein Kinases; D011494:Protein Kinases / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000235:genetics / Q000378:metabolism*; D029701:Saccharomyces cerevisiae Proteins
D005656:Fungal Proteins; D008565:Membrane Proteins; D011993:Recombinant Fusion Proteins; D029701:Saccharomyces cerevisiae Proteins; C090871:MNN2 protein, S cerevisiae; D008364:Mannosyltransferases; D011494:Protein Kinases; D020928:Mitogen-Activated Protein Kinases; C072724:SLT2 protein, S cerevisiae; D019703:Calcineurin