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Methyl-accepting chemotaxis protein III and transducer gene trg.

ABSTRACT

A comparison of the two-dimensional gel patterns of methyl-3H- and 35S-labeled membrane proteins from trg+ and trg null mutant strains of Escherichia coli indicated that the product of trg is probably methyl-accepting chemotaxis protein III. Like the other known methyl-accepting chemotaxis proteins, the trg product is a membrane protein that migrates as more than one species in sodium dodecyl sulfate-polyacrylamide gel electrophoresis, implying that it too is multiple methylated. It appears likely that all chemoreceptors are linked to the tumble regulator through a single class of membrane protein transducers which are methyl-accepting proteins. Three transducers are coded for by genes tsr, tar, and, probably, trg. Another methyl-accepting protein, which is not related to any of these genes, was observed.

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