Tryptophan residues flanking the second transmembrane helix (TM2) set the signaling state of the Tar chemoreceptor.

Abstract

The chemoreceptors of Escherichia coli are homodimeric membrane proteins that cluster in patches near the cell poles. They convert environmental stimuli into intracellular signals that control flagellar rotation. The functional domains of a receptor are physically separated by the cell membrane. Chemoeffectors bind to the extracellular (periplasmic) domain… (More)

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