PMID:338588

Komeda, Y, Silverman, M and Simon, M (1978) Identification of the structural gene for the hook subunit protein of Escherichia coli flagella.J. Bacteriol. 133:364-71

Abstract

<protect>Previous studies showed that the structural gene for the flagellar hook subunit protein (molecular weight 42,000) was one of a group of flagellar genes located on the Escherichia coli genome near pyrC. Several lines of evidence indicate that the flaK gene is the structural gene for the hook subunit protein. Fla+ strains that were insensitive to chi infection could be isolated as revertants of an FlaK- amber mutant strain but from no other Fla- strain. The hook subunit proteins isolated from such chi-sensitive revertants of the FlaK- strain were shown to be antigenically and electrophoretically different from the hook protein isolated from the wild-type strain. Thus, reversion of a mutation in the flaK gene resulted in alteration of the structure of the hook protein. Furthermore, in programming experiments with hybrid lambda containing flagellar genes, lambdafla with flaK genetic activity programmed the synthesis of a 42,000-molecular weight protein, whereas lambdafla without flaK genetic activity did not.

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