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. 1988 Oct;170(10):4613–4618. doi: 10.1128/jb.170.10.4613-4618.1988

Cloning and expression of Clostridium acetobutylicum phosphotransbutyrylase and butyrate kinase genes in Escherichia coli.

J W Cary 1, D J Petersen 1, E T Papoutsakis 1, G N Bennett 1
PMCID: PMC211500  PMID: 2844725

Abstract

A 13.6-kilobase (kb) Sau3AI restriction endonuclease fragment of Clostridium acetobutylicum DNA cloned into pBR322 enabled Escherichia coli ato mutants to grow on butyrate as a sole carbon source (But+). Complementation of the ato defect by the recombinant plasmid pJC6 was due to expression of the genes for phosphotransbutyrylase (PTB) and butyrate kinase (BK). Both genes were efficiently expressed in E. coli, as their products were readily detected by sodium dodecyl sulfate-polyacrylamide gel electrophoresis of whole-cell extracts. PTB was found to have a polypeptide subunit molecular weight of approximately 31,000, while that of BK was approximately 39,000. Deletion analysis and Tn5 mutagenesis of plasmid pJC7 (a But+ subclone containing a 4.4-kb BamHI fragment from the insert of pJC6) localized the PTB and BK genes within a region spanning approximately 2.9 kb. Preliminary evidence suggests that the two genes may form an operon that is transcribed as a single unit from a promoter of clostridial origin within the 4.4-kb insert of pJC7.

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Selected References

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