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. 1992 Apr;174(7):2281–2287. doi: 10.1128/jb.174.7.2281-2287.1992

Cloning, characterization, and inactivation of the Bacillus brevis lon gene.

K Ito 1, S Udaka 1, H Yamagata 1
PMCID: PMC205849  PMID: 1551846

Abstract

A gene of Bacillus brevis HPD31 analogous to the Escherichia coli lon gene has been cloned and characterized. The cloned gene (B. brevis lon gene) encodes a polypeptide of 779 amino acids with a molecular weight of 87,400 which resembles E. coli protease La, the lon gene product. Fifty-two percent of the amino acid residues of the two polypeptides were identical. The ATP-binding sequences found in E. coli protease La were highly conserved. The promoter of the B. brevis lon gene resembled that recognized by the major RNA polymerase of Bacillus subtilis and did not contain sequences homologous to the E. coli heat shock promoters. The B. brevis lon gene was inactivated by insertion of the neomycin resistance gene. A mutant B. brevis carrying the inactivated lon gene showed diminished ability for the degradation of abnormal polypeptides synthesized in the presence of puromycin.

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Selected References

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