Abstract
The yeast Saccharomyces cerevisiae has two closely related plasma membrane syntaxins, Sso1p and Sso2p, which together provide an essential function in vegetative cells. However, Sso1p is also specifically needed during sporulation; and this function cannot be provided by Sso2p. We used fusions between SSO1 and SSO2 to map the sporulation-specific function of SSO1. We found that the two N-terminal α-helices Ha and Hb of Sso1p are important for sporulation, since it is reduced 8-fold for fusions where Ha and Hb are derived from Sso2p. In contrast, the C-terminal half of Sso1p does not seem to be specifically required for sporulation. Surprisingly, we further found that the 3′ untranslated region (3′UTR) of SSO1 is essential for sporulation. Western blots failed to reveal a preferential expression of Sso1p in sporulating cells, indicating that effects on gene expression are unlikely to explain why the SSO1 3′UTR is needed for sporulation.
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Acknowledgements
This work was supported by grants from the Swedish Cancer Society and the Erik and Mai Pehrsson Foundation, by the research program “VTT Industrial Biotechnology” (Academy of Finland, Finnish Centre of Excellence program 2000–2005, project number 64330), and by the Academy of Finland (project number 49894).
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Öyen, M., Jäntti, J., Keränen, S. et al. Mapping of sporulation-specific functions in the yeast syntaxin gene SSO1 . Curr Genet 45, 76–82 (2004). https://doi.org/10.1007/s00294-003-0462-8
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DOI: https://doi.org/10.1007/s00294-003-0462-8