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. 1987 Dec;169(12):5700–5707. doi: 10.1128/jb.169.12.5700-5707.1987

In vivo mutagenesis of bacteriophage Mu transposase.

A Toussaint 1, L Desmet 1, M Faelen 1, R Alazard 1, M Chandler 1, M Pato 1
PMCID: PMC214061  PMID: 2824443

Abstract

We devised a method for isolating mutations in the bacteriophage Mu A gene which encodes the phage transposase. Nine new conditional defective A mutations were isolated. These, as well as eight previously isolated mutations, were mapped with a set of defined deletions which divided the gene into 13 100- to 200-base-pair segments. Phages carrying these mutations were analyzed for their ability to lysogenize and to transpose in nonpermissive hosts. One Aam mutation, Aam7110, known to retain the capacity to support lysogenization of a sup0 host (M. M. Howe, K. J. O'Day, and D. W. Shultz, Virology 93:303-319, 1979) and to map 91 base pairs from the 3' end of the gene (R. M. Harshey and S. D. Cuneo, J. Genet. 65:159-174, 1987) was shown to be able to complement other A mutations for lysogenization, although it was incapable of catalyzing either the replication of Mu DNA or the massive conservative integration required for phage growth. Four Ats mutations which map at different positions in the gene were able to catalyze lysogenization but not phage growth at the nonpermissive temperature. Phages carrying mutations located at different positions in the Mu B gene (which encodes a product necessary for efficient integration and lytic replication) were all able to lysogenize at the same frequency. These results suggest that the ability of Mu to lysogenize is not strictly correlated with its ability to perform massive conservative and replicative transposition.

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Selected References

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