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Polarized deposition of chitin at the bud neck is essential for cell separation in yeast. Chitin septum biogenesis is catalyzed by two distinct chitin synthase activities encoded by the CHS2 and CHS3 genes. The phosphoinositide phosphatase Sac1p is required for proper trafficking of the Chs3p chitin synthase. sac1 mutants also display a severe synthetic growth defect, with mutations in the SLT2 gene...
Phosphoinositide phosphatases play an essential but as yet not well-understood role in lipid-based signal transduction. Members of a subfamily of these enzymes share a specific domain that was first identified in the yeast Sac1 protein [1]. Sac1 homology domains were shown to exhibit 3- and 4-phosphatase activity in vitro [2, 3] and were also found, in addition to rat and yeast Sac1p, in yeast Inp/Sjl...
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