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. 1992 May;174(10):3282–3289. doi: 10.1128/jb.174.10.3282-3289.1992

Cloning, sequencing, and molecular analysis of the groESL operon of Clostridium acetobutylicum.

F Narberhaus 1, H Bahl 1
PMCID: PMC205997  PMID: 1349602

Abstract

The groESL operon of Clostridium acetobutylicum was cloned in Escherichia coli by using a gene probe of E. coli groESL. Sequencing of a positively reacting 2.2-kbp HindIII fragment contained in the recombinant plasmid pFN1 and a 2.5-kbp XbaI fragment present in pFN4 revealed that both fragments partially overlapped and together spanned 3,493 bp of the clostridial chromosome. Two complete open reading frames (288 and 1632 bp) were found and identified as the groES- and groEL-homologous genes of C. acetobutylicum, respectively. The 3' end of a third gene (orfZ), which was divergently transcribed, showed no significant homology to other sequences available in the EMBL and GenBank data bases. The length of the groESL-specific mRNA (2.2 kb), a transcription terminator downstream of groEL, and a transcription start site upstream of groES, identified by primer extension analysis, indicated that groES and groEL of C. acetobutylicum are organized in a bicistronic operon. From the transcription start site, the promoter structure 5'-TTGCTA (17 bp) TATTAT that shows high homology to the consensus promoter sequence of gram-positive bacteria as well as E. coli was deduced. Transcription of the groESL operon was strongly heat inducible, and maximum levels of mRNA were detected 15 min after heat shock from 30 to 42 degrees C. An 11-bp inverted repeat, located between promoter and translation start sites of groES and partially identical with similar structures in front of several heat shock genes of other bacteria, may play an important role in the regulation of heat shock gene expression in this organism.

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Selected References

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