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. 1981 Apr 15;196(1):269–283. doi: 10.1042/bj1960269

Identification of the AraE transport protein of Escherichia coli.

A J MacPherson, M C Jones-Mortimer, P J Henderson
PMCID: PMC1162991  PMID: 7030324

Abstract

1. Two arabinose-inducible proteins are detected in membrane preparations from strains of Escherichia coli containing arabinose-H+ (or fucose-H+) transport activity; one protein has an apparent subunit relative molecular mass (Mr) of 36 000-37 000 and the other has Mr 27 000. 2. An araE deletion mutant was isolated and characterized; it has lost arabinose-H+ symport activity and the arabinose-inducible protein of Mr 36 000, but not the protein of Mr 27 000. 3. An araE+ specialized transducing phage was characterized and used to re-introduce the araE+ gene into the deletion strain, a procedure that restores both arabinose-H+ symport activity and the protein of Mr 36,000. 4. N-Ethylmaleimide inhibits arabinose transport and partially inhibits arabinose-H+ symport activity. 5. N-Ethylmaleimide modifies an arabinose-inducible protein of Mr 36 000-38 000, and arabinose protects the protein against the reagent. 6. These observations identify an arabinose-transport protein of Escherichia coli as the product of the araE+ gene. 7. The protein was recognized as a single spot staining with Coomassie Blue after two-dimensional gel electrophoresis.

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