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. 1991 Nov;173(22):7219–7227. doi: 10.1128/jb.173.22.7219-7227.1991

Cloning, sequencing, and expression of the Pseudomonas testosteroni gene encoding 3-oxosteroid delta 1-dehydrogenase.

P Plesiat 1, M Grandguillot 1, S Harayama 1, S Vragar 1, Y Michel-Briand 1
PMCID: PMC209228  PMID: 1657885

Abstract

Pseudomonas testosteroni ATCC 17410 is able to grow on testosterone. This strain was mutagenized by Tn5, and 41 mutants defective in the utilization of testosterone were isolated. One of them, called mutant 06, expressed 3-oxosteroid delta 1- and 3-oxosteroid delta 4-5 alpha-dehydrogenases only at low levels. The DNA region around the Tn5 insertion in mutant 06 was cloned into pUC19, and the 1-kbp EcoRI-BamHI segment neighbor to the Tn5 insertion was used to probe DNA from the wild-type strain. The probe hybridized to a 7.8-kbp SalI fragment. Plasmid pTES5, which is a pUC19 derivative containing this 7.8-kbp SalI fragment, was isolated after the screening by the 1-kbp EcoRI-BamHI probe. This plasmid expressed delta 1-dehydrogenase in Escherichia coli cells. The 2.2-kbp KpnI-KpnI segment of pTES5 was subcloned into pUC18, and pTEK21 was constructed. In E. coli containing the lacIq plasmid pRG1 and pTEK21, the expression of delta 1-dehydrogenase was induced by isopropyl-beta-D-thiogalactopyranoside (IPTG). The induced level was about 40 times higher than the induced level in P. testosteroni. Delta 1-Dehydrogenase synthesized in E. coli was localized in the inner membrane fraction. The minicell experiments showed that a 59-kDa polypeptide was synthesized from pTEK21, and this polypeptide was located in the inner membrane fraction. The complete nucleotide sequence of the 2.2-kbp KpnI-KpnI segment of pTEK21 was determined. An open reading frame which encodes a 62.4-kDa polypeptide and which is preceded by a Shine-Dalgarno-like sequence was identified. The first 44 amino acids of the putative product exhibited significant sequence similarity to the N-terminal sequences of lipoamide dehydrogenases.

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Selected References

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