TY - JOUR

T1 - Maltooligosaccharide disproportionation reaction

T2 - an intrinsic property of amylosucrase from Neisseria polysaccharea

AU - Albenne, Cécile

AU - Skov, Lars K

AU - Mirza, Osman Asghar

AU - Gajhede, Michael

AU - Potocki-Véronèse, Gabrielle

AU - Monsan, Pierre

AU - Remaud-Simeon, Magali

PY - 2002/9/11

Y1 - 2002/9/11

N2 - 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 alpha-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.

AB - 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 alpha-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.

KW - Carbohydrate Conformation

KW - Glucosyltransferases

KW - Glycosylation

KW - Kinetics

KW - Maltose

KW - Neisseria

KW - Oligosaccharides

KW - Substrate Specificity

KW - Sucrose

KW - Trisaccharides

U2 - 10.1016/S0014-5793(02)03168-X

DO - 10.1016/S0014-5793(02)03168-X

M3 - Journal article

C2 - 12220635

VL - 527

SP - 67

EP - 70

JO - F E B S Letters

JF - F E B S Letters

SN - 0014-5793

IS - 1-3

ER -