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. 1998 Jan 2;17(1):140–148. doi: 10.1093/emboj/17.1.140

pmp1+, a suppressor of calcineurin deficiency, encodes a novel MAP kinase phosphatase in fission yeast.

R Sugiura 1, T Toda 1, H Shuntoh 1, M Yanagida 1, T Kuno 1
PMCID: PMC1170365  PMID: 9427748

Abstract

Calcineurin is a highly conserved and ubiquitously expressed Ca2+- and calmodulin-dependent protein phosphatase. The in vivo role of calcineurin, however, is not fully understood. Here, we show that disruption of the calcineurin gene (ppb1(+)) in fission yeast results in a drastic chloride ion (Cl-)-sensitive growth defect and that a high copy number of a novel gene pmp1(+) suppresses this defect. pmp1(+) encodes a phosphatase, most closely related to mitogen-activated protein (MAP) kinase phosphatases of the CL100/MKP-1 family. Pmp1 and calcineurin share an essential function in Cl- homeostasis, cytokinesis and cell viability. Pmp1 phosphatase dephosphorylates Pmk1, the third MAP kinase in fission yeast, in vitro and in vivo, and is bound to Pmk1 in vivo, strongly suggesting that Pmp1 negatively regulates Pmk1 MAP kinase by direct dephosphorylation. Consistently, the deletion of pmk1(+) suppresses the Cl--sensitive growth defect of ppb1 null. Thus, calcineurin and the Pmk1 MAP kinase pathway may play antagonistic functional roles in the Cl- homeostasis.

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Selected References

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