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. 1990 Oct;172(10):5991–5998. doi: 10.1128/jb.172.10.5991-5998.1990

Tn1000-mediated insertion mutagenesis of the histidine utilization (hut) gene cluster from Klebsiella aerogenes: genetic analysis of hut and unusual target specificity of Tn1000.

A Schwacha 1, J A Cohen 1, K B Gehring 1, R A Bender 1
PMCID: PMC526921  PMID: 2170334

Abstract

The histidine utilization (hut) genes from Klebsiella aerogenes were cloned in both orientations into the HindIII site of plasmid pBR325, and the two resulting plasmids, pCB120 and pCB121, were subjected to mutagenesis with Tn1000. The insertion sites of Tn1000 into pCB121 were evenly distributed throughout the plasmid, but the insertion sites into pCB120 were not. There was a large excess of Tn1000 insertions in the "plus" or gamma delta orientation in a small, ca. 3.5-kilobase region of the plasmid. Genetic analysis of the Tn1000 insertions in pCB120 and pCB121 showed that the hutUH genes form an operon transcribed from hutU and that the hutC gene (encoding the hut-specific repressor) is independently transcribed from its own promoter. The hutIG cluster appears not to form an operon. Curiously, insertions in hutI gave two different phenotypes in complementation tests against hutG504, suggesting either that hutI contains two functionally distinct domains or that there may be another undefined locus within the hut cluster. The set of Tn1000 insertions allowed an assignment of the gene boundaries within the hut cluster, and minicell analysis of the polypeptides expressed from plasmids carrying insertions in the hut genes showed that the hutI, hutG, hutU, and hutH genes encode polypeptides of 43, 33, 57, and 54 kilodaltons, respectively.

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Selected References

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