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Ty3 is a gypsy-type, retrovirus-like element found in the budding yeast Saccharomyces cerevisiae. In cells overexpressing Ty3 under the GAL1 upstream activation sequence, Ty3 RNA, proteins, and DNA are made. Elucidation of the molecular masses and amino-terminal sequences of protease and reverse transcriptase indicated the existence of an additional intervening domain, designated J, in the Ty3 Gag3-Pol3p polyprotein. A region analogous to J can be found in many retrotransposable elements closely related to Ty3; however, J does not correspond to any of the highly conserved retroviral protein domains. Ty3 mutants deleted for the J-coding region showed moderately reduced transposition frequency but greatly reduced levels of Ty3 DNA. These results show that under galactose regulation, the Ty3 J domain is not absolutely essential.

Ten-Kilodalton Domain in Ty3 Gag3-Pol3p between PR and RT Is Dispensable for Ty3 Transposition