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Maltooligosaccharide disproportionation reaction: an intrinsic property of amylosucrase from Neisseria polysaccharea
Author(s) -
Albenne Cécile,
Skov Lars K,
Mirza Osman,
Gajhede Michael,
Potocki-Véronèse Gabrielle,
Monsan Pierre,
Remaud-Simeon Magali
Publication year - 2002
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(02)03168-x
Subject(s) - maltotriose , maltose , chemistry , disproportionation , biochemistry , stereochemistry , enzyme , amylose , sucrose , starch , catalysis
Amylosucrase from Neisseria polysaccharea (AS) is a remarkable transglycosidase of family 13 of the glycoside hydrolases that catalyses the synthesis of an amylose‐like polymer from sucrose and is always described as a sucrose‐specific enzyme. Here, we demonstrate for the first time the ability of pure AS to catalyse the disproportionation of maltooligosaccharides by cleaving the α‐1,4 linkage at the non‐reducing end of a maltooligosaccharide donor and transferring the glucosyl unit to the non‐reducing end of another maltooligosaccharide acceptor. Surprisingly, maltose, maltotriose and maltotetraose are very poor glucosyl donors whereas longer maltooligosaccharides are even more efficient glucosyl donors than sucrose. At least five glucose units are required for efficient transglucosylation, suggesting the existence of strong binding subsites, far from the sucrose binding site, at position +4 and above.