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The protein phosphatase calcineurin is essential for NaCl tolerance of saccharomyces cerevisiae.

AuthorsMendoza, Imelda ; Rubio, Francisco ; Rodríguez Navarro, Alonso; Pardo, José M.
Issue DateMar-1994
PublisherAmerican Society for Biochemistry and Molecular Biology
CitationThe Journal of Biological Chemistry 269 (12): 8792-8796 (1994)
AbstractNaC1-sensitive yeast mutants were isolateod i dentify genes essential for NaCl tolerance. Complementation of a mutant highly sensitive to Na+ and Li+ led to the isolation of the CNBl gene. This gene encodes the regulatory subunit (CNB) of the Ca2+/calmodulin-dependent protein phosphatase calcineurin. Cells deficienitn CNB accumulated Li+ due to reduced expression of ENAl, a gene encoding a P-type ATPase involved in Na+ and Li+ efflux. In addition, the K+ transport system of cnblA cells was not converted to the high affinity state that facilitates better discriminationo f K+ over Na+. Thust he cnblA strain resembled a trk1 mutant. These results indicate that adaptation to NaCl stress in Saccharomyces cerevisiae requires a signal transduction pathway involving Ca2+ and protein phosphorylation-dephosphorylation. In this pathway, calcineurin would coordinate gene expression and activity of ion transporters to facilitate ion homeostasis.
Description5 páginas, 5 figuras, 1 tabla, 32 referencias.
Publisher version (URL)http://www.jbc.org/content/269/12/8792.full.pdf
Appears in Collections:(IRNAS) Artículos
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