Question

TyB protein from Yeast retrotransposon encodes?

1) Protease
2) RT
3) Integrase
4) Capsid

Answer 1

The TyB protein from the yeast retrotransposon encodes a Gag protein, a reverse transcriptase, a protease, and an integrase enzyme. Option 1 and 3 are correct.

Step-by-step explanation:

The TyB protein from the yeast retrotransposon encodes multiple substances. The Gag gene encodes the group-specific antigen (Gag protein), which forms a virus-like particle called VLP (virus-like particle). The RT gene encodes a reverse transcriptase enzyme responsible for making reverse-transcribed copies of retrotransposon transcript RNAs. The Prt gene encodes a protease that breaks down the VLP as the retrotransposon enters the nucleus. The Int gene encodes an integrase enzyme required for integrating the retrotransposon into a genomic DNA insertion site.

The protease is responsible for breaking down the virus-like particle as the retrotransposon enters the nucleus. The reverse transcriptase is crucial for making reverse-transcribed copies of retrotransposon transcript RNAs. Lastly, the integrase is needed for the integration of the retrotransposon into a genomic DNA insertion site. These components contribute to the retrotransposition process, which is similar to retroviral infection but without resulting in infectious viral particles.