NST1 is a family of proteins that seem to be involved, directly or indirectly, in the salt sensitivity of some cellular functions in yeast. It does this without affecting sodium accumulation. It negatively affects salt-tolerance through an interaction with the splicing factor Msl1p. This interaction stresses the importance of efficient RNA processing under salt stress conditions [1].

1: Involvement of Nst1p/YNL091w and Msl1p, a U2B'' splicing factor, in Saccharomyces cerevisiae salt tolerance. Goossens A, Forment J, Serrano R; Yeast. 2002;19:193-202. PMID:11816027