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. 1991 Oct;173(20):6438–6445. doi: 10.1128/jb.173.20.6438-6445.1991

Bacteriophage P1 gene 10 encodes a trans-activating factor required for late gene expression.

H Lehnherr 1, A Guidolin 1, W Arber 1
PMCID: PMC208978  PMID: 1917870

Abstract

Amber mutants of bacteriophage P1 were used to identify functions involved in late regulation of the P1 lytic growth cycle. A single function has been genetically identified to be involved in activation of the phage-specific late promoter sequence Ps. In vivo, P1 gene 10 amber mutants fail to trans activate a lacZ operon fusion under the transcriptional control of promoter Ps. Several P1 segments, mapping around position 95 on the P1 chromosome, were cloned into multicopy plasmid vectors. Some of the cloned DNA segments had a deleterious effect on host cells unless they were propagated in a P1 lysogenic background. By deletion and sequence analysis, the harmful effect could be delimited to a 869-bp P1 fragment, containing a 453-bp open reading frame. This open reading frame was shown to be gene 10 by sequencing the amber mutation am10.1 and by marker rescue experiments with a number of other gene 10 amber mutants. Gene 10 codes for an 18.1-kDa protein showing an unusually high density of charged amino acid residues. No significant homology to sequences present in the EMBL/GenBank data base was found, and the protein contained none of the currently known DNA-binding motifs. An in vivo trans activation assay system, consisting of gene 10 under the transcriptional control of an inducible promoter and a gene S/lacZ fusion transcribed from Ps, was used to show that gene 10 is the only phage-encoded function required for late promoter activation.

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Selected References

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