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MBC in Press, published online ahead of print June 22, 2005
Mol. Biol. Cell 10.1091/mbc.E04-11-0976

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Submitted on November 9, 2004
Revised on June 10, 2005
Accepted on June 15, 2005

The Novel Fission Yeast Protein Pal1p Interacts with Hip1-related Sla2p/End4p and Is Involved in Cellular Morphogenesis

Wanzhong Ge,*{dagger} Ting Gang Chew,*{dagger} Volker Wachtler,* Suniti N. Naqvi,* and Mohan K. Balasubramanian*{ddagger}

*Cell Division Laboratory, Temasek Life Sciences Laboratory and {ddagger}Department of Biological Sciences, National University of Singapore, Singapore 117604, Singapore

Monitoring Editor: Anthony Bretscher

The establishment and maintenance of characteristic cellular morphologies is a fundamental property of all cells. Here we describe Schizosaccharomyces pombe Pal1p, a protein important for maintenance of cylindrical cellular morphology. Pal1p is a novel membrane-associated protein that localizes to the growing tips of interphase cells and to the division site in cells undergoing cytokinesis in an F-actin and microtubule independent manner. Cells deleted for pal1 display morphological defects, characterized by the occurrence of spherical and pear-shaped cells with an abnormal cell wall. Pal1p physically interacts and displays overlapping localization with the Huntingtin-interacting-protein (Hip1)-related protein Sla2p/End4p, which is also required for establishment of cylindrical cellular morphology. Sla2p is important for efficient localization of Pal1p to the sites of polarized growth and appears to function upstream of Pal1p. Interestingly, spherical pal1{Delta} mutants polarize to establish a pear-like morphology before mitosis in a manner dependent on the kelch-repeat protein Tea1p and the cell cycle inhibitory kinase Wee1p. Thus, overlapping mechanisms involving Pal1p, Tea1p, and Sla2p contribute to the establishment of cylindrical cellular morphology, which is important for proper spatial regulation of cytokinesis.

{dagger}These authors contributed equally to this study.

Address correspondence to: Mohan K. Balasubramanian (mohan{at}tll.org.sg)




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