This family consists of two main Cytidylyltransferase activities: 1) 3-deoxy-manno-octulosonate cytidylyltransferase, [3], EC:2.7.7.38 catalysing the reaction:- CTP + 3-deoxy-D-manno-octulosonate <=> diphosphate + CMP-3-deoxy-D-manno-octulosonate, 2) acylneuraminate cytidylyltransferase EC:2.7.7.43, [1,2], catalysing the reaction:- CTP + N-acylneuraminate <=> diphosphate + CMP-N-acylneuraminate. NeuAc cytydilyltransferase of Mannheimia haemolytica has been characterised describing kinetics and regulation by substrate charge, energetic charge and amino-sugar demand[4].

1: Mammalian cytidine 5'-monophosphate N-acetylneuraminic acid synthetase: a nuclear protein with evolutionarily conserved structural motifs. Munster AK, Eckhardt M, Potvin B, Muhlenhoff M, Stanley P, Gerardy-Schahn R; Proc Natl Acad Sci U S A 1998;95:9140-9145. PMID:9689047

2: Purification, cloning, and expression of a cytidine 5'-monophosphate N-acetylneuraminic acid synthetase from Haemophilus ducreyi. Tullius MV, Munson RS Jr, Wang J, Gibson BW; J Biol Chem 1996;271:15373-15380. PMID:8663048

3: Expression of genes kdsA and kdsB involved in 3-deoxy-D-manno-octulosonic acid metabolism and biosynthesis of enterobacterial lipopolysaccharide is growth phase regulated primarily at the transcriptional level in Escherichia coli K-12. Strohmaier H, Remler P, Renner W, Hogenauer G; J Bacteriol 1995;177:4488-4500. PMID:7543480

4: Kinetic properties of the acylneuraminate cytidylyltransferase from Pasteurella haemolytica A2. Bravo IG, Barrallo S, Ferrero MA, Rodriguez-Aparicio LB, Martinez-Blanco H, Reglero A; Biochem J 2001;358:585-598. PMID:11577688