Phosphoinositides regulate a wide range of cellular processes, including proliferation, survival, cytoskeleton remodelling and membrane trafficking, yet the mechanisms controlling the kinases, phosphatases and lipases that modulate phosphoinositide levels are poorly understood. In the present study, we describe a mechanism controlling MSS4, the sole phosphatidylinositol (4)-phosphate 5-kinase in Saccharomyces cerevisiae. Mutations in MSS4 and CMD1, encoding the small Ca2+-binding protein calmodulin, confer similar phenotypes, including loss of viability and defects in endocytosis and in organization of the actin cytoskeleton. Overexpression of MSS4 suppresses the growth and actin defects of cmd1-226, a temperature-sensitive calmodulin mutant which is defective in the organization of the actin cytoskeleton. Finally, the cmd1-226 mutant exhibits reduced levels of phosphatidylinositol (4,5)-bisphosphate. These findings suggest that calmodulin positively controls MSS4 activity and thereby the actin cytoskeleton.
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September 2002
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Research Article|
September 15 2002
Calmodulin controls organization of the actin cytoskeleton via regulation of phosphatidylinositol (4,5)-bisphosphate synthesis in Saccharomyces cerevisiae
Sylvane DESRIVIÈRES;
Sylvane DESRIVIÈRES
1
∗Division of Biochemistry, Biozentrum, University of Basel, Klingelbergstrasse 70, CH-4056 Basel, Switzerland,
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Frank T. COOKE;
Frank T. COOKE
†Protein Phosphorylation Laboratory, Cancer Research UK London Research Institute, Lincoln's Inn Fields Laboratories, 44 Lincoln's Inn Fields, London WC2A 3PX, U.K.
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Helena MORALES-JOHANSSON;
Helena MORALES-JOHANSSON
∗Division of Biochemistry, Biozentrum, University of Basel, Klingelbergstrasse 70, CH-4056 Basel, Switzerland,
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Peter J. PARKER;
Peter J. PARKER
†Protein Phosphorylation Laboratory, Cancer Research UK London Research Institute, Lincoln's Inn Fields Laboratories, 44 Lincoln's Inn Fields, London WC2A 3PX, U.K.
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Michael N. HALL
Michael N. HALL
2
∗Division of Biochemistry, Biozentrum, University of Basel, Klingelbergstrasse 70, CH-4056 Basel, Switzerland,
2To whom correspondence should be addressed (e-mail M.Hall@unibas.ch).
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Biochem J (2002) 366 (3): 945–951.
Article history
Received:
March 14 2002
Revision Received:
June 17 2002
Accepted:
June 21 2002
Accepted Manuscript online:
June 21 2002
Citation
Sylvane DESRIVIÈRES, Frank T. COOKE, Helena MORALES-JOHANSSON, Peter J. PARKER, Michael N. HALL; Calmodulin controls organization of the actin cytoskeleton via regulation of phosphatidylinositol (4,5)-bisphosphate synthesis in Saccharomyces cerevisiae. Biochem J 15 September 2002; 366 (3): 945–951. doi: https://doi.org/10.1042/bj20020429
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