Probing the molecular determinants of Ty1 retrotransposon restriction specificity in yeast.

ABSTRACT: The evolutionary history of retrotransposons and their hosts shapes the dynamics of transposition and restriction. The Pseudoviridae of yeast includes multiple Ty1 LTR-retrotransposon subfamilies. Saccharomyces cerevisiae prevents uncontrolled retrotransposition of Ty1 subfamilies using distinct mechanisms: canonical Ty1 is inhibited by a self-encoded restriction factor, p22/p18, whereas Ty1' is inhibited by an endogenized restriction factor, Drt2. The minimal inhibitory fragment of both restriction factors (p18m and Drt2m) is a conserved C-terminal capsid domain. Here, we use biophysical and genetic approaches to demonstrate that p18m and Drt2m are highly specific to their subfamilies. Although the crystal structures of p18m and Drt2m are similar, three divergent residues found in a conse

SUBMITTER: Beckwith SL 

PROVIDER: S-EPMC12530519 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature