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Reference: Payne WE, et al. (2000) Isolation of Pichia pastoris genes involved in ER-to-Golgi transport. Yeast 16(11):979-93

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Abstract

Pichia pastoris has discrete transitional ER sites and coherent Golgi stacks, making this yeast an ideal system for studying the organization of the early secretory pathway. To provide molecular tools for this endeavour, we isolated P. pastoris homologues of the SEC12, SEC13, SEC17, SEC18 and SAR1 genes. The P. pastoris SEC12, SEC13, SEC17 and SEC18 genes were shown to complement the corresponding S. cerevisiae mutants. The SEC17 and SAR1 genes contain introns at the same relative positions in both P. pastoris and S. cerevisiae, whereas the SEC13 gene contains an intron in P. pastoris but not in S. cerevisiae. Intron structure is similar in the two yeasts, although the favoured 5' splice sequence appears to be GTAAGT in P. pastoris vs. GTATGT in S. cerevisiae. The predicted amino acid sequences of Sec13p, Sec17p, Sec18p and Sar1p show strong conservation in the two yeasts. By contrast, the predicted lumenal domain of Sec12p is much larger in P. pastoris, suggesting that this domain may help localize Sec12p to transitional ER sites. A comparison of the SEC12 loci in various budding yeasts indicates that the SEC12-related gene SED4 is probably unique to the Saccharomyces lineage.

Reference Type
Journal Article
Authors
Payne WE, Kaiser CA, Bevis BJ, Soderholm J, Fu D, Sears IB, Glick BS
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