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Function of rax2p in the polarized growth of fission yeast.

Mol. Cells. 2006 Oct 31;22(2):146-53
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摘要


Cell polarity is critical for the division, differentiation, migration, and signaling of eukaryotic cells. RAX2 of budding yeast encodes a membrane protein localized at the cell cortex that helps maintain the polarity of the bipolar pattern. Here, we designate as rax2+ of Schizosaccharomyces pombe, based on its sequence homology with RAX2, and examine its function in cell polarity. S. pombe rax2+ is not essential, but Deltarax2 cells are slightly smaller and grow slower than wild type cells. During vegetative growth or arrest at G1 by mutation of cdc10, deletion of rax2+ increases the number of cells failing old end growth just after division. In addition, this failure of old end growth is dramatically increased in Deltatea1Deltarax2, pointing to genetic interaction of rax2+ with tea1+. Deltarax2 cells contain normal actin and microtubule cytoskeletons, but lack actin cables, and the polarity factor for3p is not properly localized at the growing tip. In Deltarax2 cells, and endogenous rax2p is localized at the cell cortex of growing cell tips in an actin- and microtubule-dependent manner. However, Deltarax2 cells show no defects in cell polarity during shmoo formation and conjugation. Taken together, these observations suggest that rax2p controls the cell polarity of fission yeast during vegetative growth by regulating for3p localization.

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