CMP-NeuAc_Synthase activates N-acetylneuraminic acid by adding CMP moiety. CMP-N-acetylneuraminic acid synthetase (CMP-NeuAc synthetase) or acylneuraminate cytidylyltransferase catalyzes the transfer the CMP moiety of CTP to the anomeric hydroxyl group of NeuAc in the presence of Mg++. It is the second to last step in the sialylation of the oligosaccharide component of glycoconjugates by providing the activated sugar-nucleotide cytidine 5'-monophosphate N-acetylneuraminic acid (CMP-Neu5Ac), the substrate for sialyltransferases. Eukaryotic CMP-NeuAc synthetases are predominantly located in the nucleus. The activated CMP-Neu5Ac diffuses from the nucleus into the cytoplasm.

CMP-N-acetylneuraminic acid synthetase [Cell wall/membrane/envelope biogenesis].

Spore coat polysaccharide biosynthesis protein SpsG, predicted glycosyltransferase [Cell wall/membrane/envelope biogenesis].

UDP-2,4-diacetamido-2,4,6-trideoxy-beta-L-altropyranose hydrolase. This protein is found in association with enzymes involved in the biosynthesis of pseudaminic acid, a component of polysaccharide in certain Pseudomonas strains as well as a modification of flagellin in Campylobacter and Hellicobacter. The role of this protein is unclear, although it may participate in N-acetylation in conjunction with, or in the absence of PseH (TIGR03585) as it often scores above the trusted cutoff to pfam00583 representing a family of acetyltransferases.

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

CrystalStructure of CMP-N-acetylneuraminate Synthetase from Vibrio cholerae in complex with CDP and Mg2+. [Vibrio cholerae],6IFD_B Crystal Structure of CMP-N-acetylneuraminate Synthetase from Vibrio cholerae in complex with CDP and Mg2+. [Vibrio cholerae],6IFD_C Crystal Structure of CMP-N-acetylneuraminate Synthetase from Vibrio cholerae in complex with CDP and Mg2+. [Vibrio cholerae],6IFD_D Crystal Structure of CMP-N-acetylneuraminate Synthetase from Vibrio cholerae in complex with CDP and Mg2+. [Vibrio cholerae],6IFI_A Crystal Structure of the Apo form of CMP-N-acetylneuraminate Synthetase from Vibrio cholerae [Vibrio cholerae],6IFI_B Crystal Structure of the Apo form of CMP-N-acetylneuraminate Synthetase from Vibrio cholerae [Vibrio cholerae]

TheCrystal Structure of Murine CMP-5-N-Acetylneuraminic Acid Synthetase [Mus musculus],1QWJ_B The Crystal Structure of Murine CMP-5-N-Acetylneuraminic Acid Synthetase [Mus musculus],1QWJ_C The Crystal Structure of Murine CMP-5-N-Acetylneuraminic Acid Synthetase [Mus musculus],1QWJ_D The Crystal Structure of Murine CMP-5-N-Acetylneuraminic Acid Synthetase [Mus musculus]

N.meningitidis CMP-sialic acid synthetase, ligand-free [Neisseria meningitidis],6CKK_A N. meningitidis CMP-sialic acid synthetase in the presence of CTP and Ca2+ [Neisseria meningitidis],6CKK_B N. meningitidis CMP-sialic acid synthetase in the presence of CTP and Ca2+ [Neisseria meningitidis],6CKL_A N. meningitidis CMP-sialic acid synthetase in the presence of CMP and Neu5Ac2en [Neisseria meningitidis],6CKL_B N. meningitidis CMP-sialic acid synthetase in the presence of CMP and Neu5Ac2en [Neisseria meningitidis],6CKL_C N. meningitidis CMP-sialic acid synthetase in the presence of CMP and Neu5Ac2en [Neisseria meningitidis],6CKM_A N. meningitidis CMP-sialic acid synthetase in the presence of CMP-sialic acid and Ca2+ [Neisseria meningitidis]

Pseudaminic acid cytidylyltransferase OS=Campylobacter jejuni subsp. jejuni serotype O:2 (strain ATCC 700819 / NCTC 11168) OX=192222 GN=pseF PE=3 SV=1

Uncharacterized protein MJ1062 OS=Methanocaldococcus jannaschii (strain ATCC 43067 / DSM 2661 / JAL-1 / JCM 10045 / NBRC 100440) OX=243232 GN=MJ1062 PE=1 SV=1

Pseudaminic acid cytidylyltransferase OS=Campylobacter jejuni subsp. jejuni serotype O:23/36 (strain 81-176) OX=354242 GN=pseF PE=3 SV=1

N-acylneuraminate cytidylyltransferase A OS=Danio rerio OX=7955 GN=cmasa PE=1 SV=1

Post-translational flagellin modification protein B OS=Campylobacter coli OX=195 GN=ptmB PE=3 SV=1