CheR proteins are part of the chemotaxis signaling mechanism in bacteria. CheR methylates the chemotaxis receptor at specific glutamate residues. CheR is an S-adenosylmethionine- dependent methyltransferase - the C-terminal domain (this one) binds SAM.

1: Crystal structure of the chemotaxis receptor methyltransferase CheR suggests a conserved structural motif for binding S-adenosylmethionine. Djordjevic S, Stock AM; Structure 1997;5:545-558. PMID:9115443