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. 1975 May;147(2):313–326. doi: 10.1042/bj1470313

The partial amino acid sequence of the extracellular beta-lactamase I of Bacillus cereus 569/H.

D R Thatcher
PMCID: PMC1165445  PMID: 810136

Abstract

The chemical structure of the extracellular beta-lactamase I of Bacillus cereus 569/H was investigated. Three electrophoretically homogenous charge variants of this enzyme were isolated and amino acid analysis of each revealed no significant differences. However, a degree of N-terminal heterogeneity was found by direct end-group modification of the protein and also on alignment of peptides from tryptic and chymotryptic digestion. The N-terminal heterogeneity observed was great enough to explain the production of the beta-lactamase I isoenzymes which are probably produced by postsynthesis modification of a single gene product. Over 80% of the amino acid sequence of beta-lactamase I was determined by the detailed analysis of peptides derived from tryptic, chymotryptic and thermolytic digests. Five polypeptide fragments were constructed from these data and aligned by comparison with the known amino acid sequences of the penicillinases produced by Bacillus licheniformis and Staphylococcus aureus (Ambler & Meadway, 1969). About 60% of the proposed sequence was identical with that of B. licheniformis penicillinase, whereas the S. aureus enzyme had only about 40% of its residues in common with beta-lactamase I. These results are discussed with reference to the possible evolutionary relationships existing between known beta-lactamases. Detailed evidence for the amino acid sequence proposed has been deposited as Supplementary Publication SUP 50044 (27 pages) at the British Library (Lending Division), Boston Spa, Wetherby, W. Yorks. LS23 7BQ, U.K., from whom copies can be obtained on the terms indicated in Biochem. J. (1975), 145, 5.

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Selected References

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