1887

Abstract

Phage P4 gene encodes the integrase responsible for phage integration into and excision from the chromosome. Here, the data showing that P4 expression is regulated in a complex manner at different levels are presented. First of all, the P promoter is regulated negatively by both Int and Vis, the P4 excisionase. The N-terminal portion of Int appears to be sufficient for such a negative autoregulation, suggesting that the Int N terminus is implicated in DNA binding. Second, full-length transcripts covering the entire gene could be detected only upon P4 infection, whereas in P4 lysogens only short 5′-end covering transcripts were detectable. On the other hand, transcripts covering the 5′-end of were also very abundant upon infection. It thus appears that premature transcription termination and/or mRNA degradation play a role in Int-negative regulation both on the basal prophage transcription and upon infection. Finally, comparison between P transcriptional and translational fusions suggests that Vis regulates Int expression post-transcriptionally. The findings that Vis is also an RNA-binding protein and that Int may be translated from two different start codons have implications on possible regulation models of Int expression.

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2006-08-01
2021-08-02
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