Represents a citryl-ACP lyase. citrate = acetate + oxaloacetate (3S)-citryl-CoA = acetyl-CoA + oxaloacetate Binds 1 Mg(2+) ion per subunit. Oligomer with a subunit composition of (alpha,beta,gamma)6. Repressed by H-NS. Part of the citCDEFXG operon. Belongs to the HpcH/HpaI aldolase family. Citrate lyase beta subunit subfamily. Extended N-terminus.