Abstract
The pelB gene, which encodes one of the five pectate lyase isoenzymes of Erwinia chrysanthemi 3937, was mutagenized with a mini-Mu transposable element that can form gene fusions to the neomycin phosphotransferase-encoding region. Secondary mutants resistant to kanamycin in the absence of polygalacturonate, an inducer of wild-type pectate lyase activities, were selected. Such mutants produced other pectate lyase isoenzymes in the absence of the inducer.
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