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Chemotaxis response regulator protein-glutamate methylesterase, CheB, with N-terminal REC domain This family contains the methylesterase CheB (EC 3.1.1.61; also known as CheB methylesterase, chemotaxis-specific methylesterase, methyl-accepting chemotaxis protein methyl-esterase, or protein methyl-esterase) domain with a REC domain at the N-terminus. CheB is a phosphorylation-activated response regulator involved in reversible modification of bacterial chemotaxis receptors. Signaling output of the chemotaxis receptors is modulated by CheB and methyltransferase CheR by controlling the level of receptor methylation. The N-terminal regulatory (REC) domain blocks the active site of the C-terminal domain until it is phosphorylated. Reversible methylation of transmembrane chemoreceptors plays an important role in ligand-dependent signaling and cellular adaptation in bacterial chemotaxis. Phosphorylated CheB catalyzes deamidation of specific glutamine residues in the cytoplasmic region of the chemoreceptors and demethylation of specific methyl glutamate residues introduced into the chemoreceptors by CheR. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",