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. 1987 Apr;169(4):1619–1625. doi: 10.1128/jb.169.4.1619-1625.1987

Molecular cloning of genes encoding branched-chain keto acid dehydrogenase of Pseudomonas putida.

P J Sykes, G Burns, J Menard, K Hatter, J R Sokatch
PMCID: PMC211990  PMID: 3549697

Abstract

We cloned the structural genes for the individual subunits of the branched-chain keto acid dehydrogenase multienzyme complex on a 7.8-kilobase EcoRI-SstI restriction fragment of Pseudomonas putida chromosomal DNA by cloning into the broad-host-range vector pKT230. A direct selection system for growth on valine-isoleucine agar was achieved by complementation of P. putida branched-chain keto acid dehydrogenase mutants. The recombinant plasmid, pSS1-1, increased expression of branched-chain keto acid dehydrogenase up to five times in wild-type P. putida. The complex was expressed constitutively in P. putida(pSS1-1) but was inducible in Escherichia coli HB101(pSS1-1) by high valine. E. coli minicells transformed with pSS1-1 produced three polypeptides which did not match the four polypeptides of the purified complex. To resolve this problem, we inserted P. putida DNA from pSS1-1 into pUC18 and pUC19. The pUC-derived plasmids were used as DNA templates in an E. coli transcription-translation system. Four polypeptides were produced from the pUC18-derived plasmid which had the correct molecular weights, showing that the structural genes had been cloned. Since only weak bands were produced with the pUC19-derived plasmid, the direction of transcription was established. The locations and order of all the structural genes of branched-chain keto acid dehydrogenase were located by restriction enzyme mapping.

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Selected References

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