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Fission yeast syt22 protein, a putative Arf guanine nucleotide exchange factor, is necessary for new end take off. | LitMetric
In fission yeast Schizosaccharomyces pombe, the directions of cell growth change from monopolar to bipolar in character, which is known as 'new end take off ' (NETO). We previously found that arf6p, a member (class III) of the ADP-ribosylation factor (Arf) family, is necessary for NETO in fission yeast. Here we report the characterization of an S. pombe gene, syt22(+), encoding a putative Arf guanine nucleotide exchange factor (GEF). The syt22 protein contains a Sec7 domain and a PH domain conserved in the mammalian EFA6 GEF family, and has high similarity to Yel1p, which was identified as a GEF for Arf3p (class III Arf) in Saccharomyces cerevisiae. syt22Delta cells, like arf6Delta cells, completely failed to undergo NETO. Syt22p uniformly localizes to the cell periphery. Its localization is not dependent on microtubules, actin cytoskeletons or arf6p. We hypothesize that syt22p functions as a GEF for arf6p.
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