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. 1989 Jul;171(7):3796–3802. doi: 10.1128/jb.171.7.3796-3802.1989

Transposon mutagenesis, characterization, and cloning of transformation genes of Haemophilus influenzae Rd.

J F Tomb 1, G J Barcak 1, M S Chandler 1, R J Redfield 1, H O Smith 1
PMCID: PMC210127  PMID: 2544555

Abstract

A plasmid library of PstI fragments of Haemophilus influenzae Rd genomic DNA was mutagenized in Escherichia coli with mini-Tn10kan. The mutagenized PstI fragments were introduced by transformation into the H. influenzae chromosome, and kanamycin-resistant transformants were screened for the transformation-deficient phenotype by a cyclic AMP-DNA plate method. Fifty-four mutant strains containing 24 unique insertions that mapped to 10 different PstI fragments were isolated. Strains carrying unique insertions were tested individually for DNA uptake, transformation efficiency, UV sensitivity, and growth rate. The transformation frequencies of these mutants were decreased by factors of 10(-2) to 10(-6). Five of the mutants had normal competence-induced DNA uptake, and the rest were variably deficient in competence development. Three strains were moderately UV sensitive. All strains but one had doubling times within 50% of that of the wild type. Mutated genes were cloned into an H. influenzae-E. coli shuttle vector, and wild-type loci were recovered by in vivo recombinational exchange. Hybridization of these clones to SmaI genomic fragments separated in pulsed-field gels showed that these insertions were not clustered in a particular region of the chromosome.

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Selected References

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