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The four methyl-accepting chemotaxis proteins of Escherichia coli, often called transducers, are transmembrane receptor proteins that exhibit substantial identity among the sequences of their cytoplasmic domains. Thus, antiserum raised to one of these proteins recognizes the others and might be expected to recognize related proteins in other bacteria. We used antiserum raised to the transducer Trg in immunoblot experiments to probe a wide range of bacterial species for the presence of antigenically related proteins. Such proteins were detected in over 20 different species, representing 6 of the 11 eubacterial phyla defined by analysis of rRNA sequences as well as one archaebacterial group. Species containing proteins antigenically related to the transducers of E. coli included members of all four subdivisions of the phylum in which E. coli is placed, members of four of the six subdivisions of spirochetes, and two gliding bacteria. These observations provide substantial support for the notion that methyl-accepting taxis proteins are widely distributed among the diversity of bacterial species.

Proteins antigenically related to methyl-accepting chemotaxis proteins of Escherichia coli detected in a wide range of bacterial species