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Interactions in the ESCRT-III network of the yeast Saccharomyces cerevisiae

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Abstract

Here, we examine the genetic interactions between ESCRT-III mutations in the yeast Saccharomyces cerevisiae. From the obtained interaction network, we make predictions about alternative ESCRT-III complexes. By the successful generation of an octuple deletion strain using the CRISPR/Cas9 technique, we demonstrate for the first time that ESCRT-III activity as a whole is not essential for the life of a yeast cell. Endosomal sorting complex required for transport (ESCRT)-III proteins are membrane remodeling factors involved in a multitude of cellular processes. There are eight proteins in yeast with an ESCRT-III domain. It is not clear whether the diverse ESCRT-III functions are fulfilled by a single ESCRT-III complex or by different complexes with distinct composition. Genetic interaction studies may provide a hint on the existence of alternative complexes. We performed a genetic mini-array screen by analyzing the growth phenotypes of all pairwise combinations of ESCRT-III deletion mutations under different stress conditions. Our analysis is in line with previous data pointing to a complex containing Did2/CHMP1 and Ist1/IST1. In addition, we provide evidence for the existence of a novel complex consisting of Did2/CHMP1 and Vps2/CHMP2. Some of the interactions on Congo red plates could be explained by effects of ESCRT-III mutations on Rim101 signaling.

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Acknowledgements

This work was supported by Deutsche Forschungsgemeinschaft (DFG) Grant KO-963/8-1.

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Correspondence to Ralf Kölling.

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Communicated by M. Kupiec.

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Brune, T., Kunze-Schumacher, H. & Kölling, R. Interactions in the ESCRT-III network of the yeast Saccharomyces cerevisiae. Curr Genet 65, 607–619 (2019). https://doi.org/10.1007/s00294-018-0915-8

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  • DOI: https://doi.org/10.1007/s00294-018-0915-8

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