Probable methylesterase (By similarity). Required for the normal aggregation of M.xanthus cells during fruiting body formation. It is also a component of a sensory transduction pathway that controls the frequency at which cells reverse their gliding direction. It may remove the methyl group from the gamma-glutamyl methyl ester residues in FrzCD. [protein]-L-glutamate 5-O-methyl ester + H2O = H(+) + L-glutamyl-[protein] + methanol