Identification of polypeptides necessary for chemotaxis in Escherichia coli - PubMed (original) (raw)
Identification of polypeptides necessary for chemotaxis in Escherichia coli
M Silverman et al. J Bacteriol. 1977 Jun.
Abstract
Molecular cloning techniques were used to construct Escherichia coli-lambda hybrids that contained many of the genes necessary for flagellar rotation and chemotaxis. The properties of specific hybrids that carried the classical "cheA" and "cheB" loci were examined by genetic complementation and by measuring the capacity of the hybrids to direct the synthesis of specific polypeptides. The results of these tests with lambda hybrids and with a series of deletion mutations derived from the hybrids redefined the "cheA" and "cheB" regions. Six genes were resolved: cheA, cheW, cheX, cheB, cheY, and cheZ. They directed the synthesis of specific polypeptides with the following apparent molecular weights: cheA, 76,000 and 66,000; cheW, 12,000; cheX, 28,000; cheB, 38,000; cheY, 8,000; and cheZ, 24,000. The presence of another gene, cheM, was inferred from the protein synthesis experiments. The cheM gene directed the synthesis of polypeptides with apparent molecular weights of 63,000, 61,000, and 60,000. The synthesis of all of these polypeptides is regulated by the same mechanisms that regulate the synthesis of flagellar-related structural components.
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