Abstract
A fragment of DNA (3.1 kilobases [kb]) from a ColE1 Escherichia coli DNA hybrid plasmid containing the bacterial citrate synthase gene (gltA) was subcloned in both orientations into phage lambda vectors by in vitro recombination. The resulting phages were able to transduce gltA and, as prophages, complemented the lesion of a gltA mutant, showing that a functional gltA gene is contained in the 3.1-kb fragment. The segment of E. coli DNA cloned in these lambda gltA phages was extended in vivo by prophage integration and aberrant excision in the gltA region. Plaque-forming derivatives, carrying up to three additional tricarboxylic acid cycle genes, succinate dehydrogenase (sdh), 2-oxoglutarate dehydrogenase (sucA), and dihydrolipoamide succinyltransferase (sucB), were isolated and characterized by their transducing and complementing activities with corresponding mutants, and the order of the genes was confirmed as gltA-sdh-sucA-sucB. Physical maps of a variety of the transducing phages showed that the four tricarboxylic acid cycle genes are contained in a 12.8-kb segment of bacterial DNA. The four gene products, plus a possible succinate dehydrogenase small subunit, were identified in postinfection labeling studies, and the polarities of gene expression were defined as counterclockwise for gltA and clockwise for sdh, sucA, and sucB, relative to the E. coli linkage map.
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