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Molecular and Cellular Biology, April 2003, p. 2762-2777, Vol. 23, No. 8
0270-7306/03/$08.00+0     DOI: 10.1128/MCB.23.8.2762-2777.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Molecular Dissection of a Yeast Septin: Distinct Domains Are Required for Septin Interaction, Localization, and Function

Antonio Casamayor and Michael Snyder*

Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, Connecticut 06520-8103

Received 1 October 2002/ Returned for modification 18 November 2002/ Accepted 23 January 2003

The septins are a family of cytoskeletal proteins present in animal and fungal cells. They were first identified for their essential role in cytokinesis, but more recently, they have been found to play an important role in many cellular processes, including bud site selection, chitin deposition, cell compartmentalization, and exocytosis. Septin proteins self-associate into filamentous structures that, in yeast cells, form a cortical ring at the mother bud neck. Members of the septin family share common structural domains: a GTPase domain in the central region of the protein, a stretch of basic residues at the amino terminus, and a predicted coiled-coil domain at the carboxy terminus. We have studied the role of each domain in the Saccharomyces cerevisiae septin Cdc11 and found that the three domains are responsible for distinct and sometimes overlapping functions. All three domains are important for proper localization and function in cytokinesis and morphogenesis. The basic region was found to bind the phosphoinositides phosphatidylinositol 4-phosphate and phosphatidylinositol 5-phosphate. The coiled-coil domain is important for interaction with Cdc3 and Bem4. The GTPase domain is involved in Cdc11-septin interaction and targeting to the mother bud neck. Surprisingly, GTP binding appears to be dispensable for Cdc11 function, localization, and lipid binding. Thus, we find that septins are multifunctional proteins with specific domains involved in distinct molecular interactions required for assembly, localization, and function within the cell.

* Corresponding author. Mailing address: Department of Molecular, Cellular and Developmental Biology, Yale University, P.O. Box 208103, New Haven, CT 06520-8103. Phone: (203) 432-6139. Fax: (203) 432-6161. E-mail: michael.snyder{at}yale.edu.

Molecular and Cellular Biology, April 2003, p. 2762-2777, Vol. 23, No. 8
0022-538X/03/$08.00+0     DOI: 10.1128/MCB.23.8.2762-2777.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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