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. 1980 Jun;142(3):829–835. doi: 10.1128/jb.142.3.829-835.1980

Properties of Haemophilus influenzae mutants that are slightly recombination deficient and carry a mutation in the rec-1 gene region.

J Kooistra, G Venema
PMCID: PMC294107  PMID: 6966628

Abstract

The highly recombination-deficient rec-1 mutants of Haemophilus influenzae are, as far as tested, equivalent to recA mutants of Escherichia coli. By selection for mutations in the rec-1 gene of H. influenzae, mutants designated ird (intermediary recombination-deficient) mutants were isolated; these mutants were much less recombination deficient (degree of transformability, 0.2 to 30% of wild-type value) than previously isolated rec-1 mutants (degree of transformability, 0.0001% of wild-type value). The ird mutants were more sensitive to ultraviolet irradiation and mytomycin C treatment than the wild type, but less sensitive than rec-1 mutants. Spontaneous production of phage HP1c1 by lysogenic MC11 cells and prophage induction by mitomycin C or ultraviolet irradiation were the same as in the wild type. In the ird mutants endogenous deoxyribonucleic acid was degraded both spontaneously and after ultraviolet irradiation to the same extent as in the wild type. Examination of one of the ird mutants revealed that recombination could be enhanced by ultraviolet irradiation, possibly because of an increased synthesis of the rec-1 gene product induced by ultraviolet irradiation.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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