Intramolecular trans-sialidase (IT-sialidase) specifically cleaves the terminal N-acetyl-neuraminic acid-alpha-2-3-Galactose linkage in sialoglyco-conjugates. The released product is 2,7-anhydro-N-acetyl-neuraminic acid, indicating that the enzyme carries out an intramolecular reaction mechanism. This is in contrast to the hydrolytic sialidases whose product is free N-acetyl-neuraminic acid.
Defined by 3 residues: ASP:A-238 [auth A-318]GLU:A-515 [auth A-595]TYR:A-633 [auth A-713]