In actinomycetes that produce beta-lactam antibiotics of the cephem type, lysine epsilon-aminotransferase is the initial enzyme in the conversion of lysine to alpha-aminoadipic acid. We used a two-stage process ("chromosome walking") to screen a lambda library of Streptomyces clavuligerus genomic DNA for fragments that expressed lysine epsilon-aminotransferase activity in S. lividans. Restriction analysis of the cloned DNA confirmed the location of the putative lat gene within the cluster of beta-lactam biosynthesis genes, roughly midway between pcbC, the structural gene for isopenicillin N synthetase, and the putative cefE gene encoding deacetoxycephalosporin C synthetase.
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| http://dx.doi.org/10.1128/jb.173.3.985-988.1991 | DOI Listing |
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