The Pisum sativum MAP kinase homologue (PsMAPK) rescues the Saccharomyces cerevisiae hog1 deletion mutant under conditions of high osmotic stress |
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Authors: | Bert Pöpping Terry Gibbons Martin D Watson |
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Institution: | (1) Department of Biological Sciences, University of Durham, South Road, DH1 3LE Durham, UK |
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Abstract: | Previous analysis of the MAP kinase homologue from Pisum sativum (PsMAPK) revealed a potential MAP kinase motif homologous to that found in eukaryotic cdc2 kinases. Sequence comparison showed a 47% identity on amino acid sequence basis to the Saccharomyces cerevisiae Hog 1p MAP kinase involved in the osmoregulatory pathway. Under conditions of salt-stress aberrant morphology of a hog1 deletion mutant was completely restored and growth was partially restored by expression of the PsMAPK. This shows that PsMAPK is functionally active as a MAP kinase in S. cerevisiae. Comparison of PsMAPK with other kinases involved in osmosensitivity, showed a high degree of homology and implicates a possible role for PsMAPK in a P. sativum osmosensing signal transduction pathway. |
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Keywords: | MAP kinase osmotic stress Pisum sativum Saccharomyces cerevisiae signal transduction |
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