Protein
N-acetylneuraminate epimerase
Organism
Yersinia enterocolitica serotype O:8 / biotype 1B (strain NCTC 13174 / 8081)
Function
Converts alpha-N-acetylneuranimic acid (Neu5Ac) to the beta-anomer, accelerating the equilibrium between the alpha- and beta-anomers. Probably facilitates sialidase-negative bacteria to compete sucessfully for limited amounts of extracellular Neu5Ac, which is likely taken up in the beta-anomer. In addition, the rapid removal of sialic acid from solution might be advantageous to the bacterium to damp down host responses.
Similarity
Belongs to the NanM family.
Sequence
MTQIYHQYKKKLSTKVILLSALTLCITFSLPYANAERYPDVPVAFKYGTGARVDNHLYVGLGSAGQSWYRLDTDKASSGWQKIADFPGQPREQAVTVALSGKLYVFGGVGKNSASDTQVRALDDVYQYDPQTNQWQRLATRAPRGLVGTAATTLNGTQALLLGGVNKAIFDGYFTDLAAAGGNETQKNAVVNAYFDQAPADYFYNRDVLMYDPAKNQWKSGGQVPFLGTAGSAITAKKGDLILINGEIKPGLRTAAVWQGKTQGTELKWQQRPDLIGAEKGAVQEGLAGAFAGVSHDVVLVGGGANFPGSWQQFNAGQLYAHQGLKKQWQQPIYALVDNQWQVAGKLPQPLAYGVSIQDKDKVILLGGETSDGVATSAVTQLSWQGGKLHLE