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We have developed a versatile system that permits efficient manipulation of coryneform bacteria by gene disruption and replacement. Circumventing the methyl-specific restriction system in certain of these bacteria by using non-methylated plasmid DNA was necessary. Integrative plasmid DNA containing an in vitro disrupted copy of the Brevihacterium ftavum thr B gene was introduced into B. ftavum at an efficiency of 2.4 × 102 integrants/μg. Integration occurred by homologous recombination either via a Campbell-like mechanism or via a double crossover event. Integrants were stable for over 32 generations.
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Vertès et al. (1993) studied this question.
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