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. 1992 Jun;174(12):3981–3992. doi: 10.1128/jb.174.12.3981-3992.1992

Cloning and characterization of the groESL operon from Bacillus subtilis.

M Li 1, S L Wong 1
PMCID: PMC206107  PMID: 1350776

Abstract

The sequence of the 10 N-terminal amino acids of a Bacillus subtilis protein that cross-reacts with antibody to Escherichia coli GroEL was used to design a set of degenerate oligonucleotide probes. These probes identified a clone which carries almost the entire groESL operon from a B. subtilis subgenomic library. By chromosomal walking, an additional fragment carrying the 3' end of groESL and its flanking sequence was isolated. Sequence analysis revealed two open reading frames (ORFs) in the cloned DNA. The upstream ORF encodes a 10-kDa protein which has 47% amino acid identity with E. coli GroES. The downstream ORF encodes a 58-kDa protein which is 62% identical to E. coli GroEL. A 2.1-kb groESL mRNA from B. subtilis was detected independently by Northern (RNA) blot analyses with a groES- and a groEL-specific probe. This demonstrated that groES and groEL are in an operon. The groESL promoter was located by using a promoter-probing plasmid, and the apparent transcription start site was mapped by primer extension analysis. The same promoter is utilized under normal and heat shock conditions. This promoter has the same features as a typical sigma A promoter. A strain in which the groESL operon was under the control of the sucrose-inducible sacB promoter was created. With this strain, it was possible to show that both groES and groEL are essential genes under both normal and heat shock conditions.

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Selected References

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