methylates specific glutamate residues within a coiled coil region, to form gamma-glutamyl methyl ester residues. [ 1 ] [ 2 ] The structure of the Salmonella typhimurium chemotaxis receptor methyltransferase CheR, bound to S-adenosylhomocysteine , has been determined to a resolution of 2.0 Angstrom. [ 1 ] The structure reveals CheR to