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Enzymatic characterization of bovine alpha-1,3-galactosyltransferase. Validation of a radiometric assay and kinetic mechanism
KTH, Skolan för bioteknologi (BIO), Glykovetenskap.
2005 (spansk)Inngår i: Afinidad, ISSN 0001-9704, Vol. 62, nr 519, s. 505-512Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [es]

alpha 3-Galactosyltransferase (alpha 3GT) transfers galactose from UDP-Gal (sugar nucleotide donor) to the N-acetyllactosaminyl or lactosyl terminal groups of glycoproteins and glycolipids, catalyzing the formation of an alpha-1,3 glycosidic bond. The terminal saccharide Gal alpha 3NAcGal beta 4Glu-R is the main antigenic determinant responsible of the hyperaccute rejection in xenotransplantation. A radiometric assay for the determination of alpha 3GT activity is implemented and validated. The recombinant enzyme (catalytic domain) expressed in Eschericia coli follows a bi bi sequential ordered kinetic mechanism with binding of donor substrate (UDP-Gal) first and acceptor substrate to form a productive ternary complex. K-M values are 30 mu M for UDP-Gal, and 1.2 mM for lactose.

sted, utgiver, år, opplag, sider
2005. Vol. 62, nr 519, s. 505-512
Emneord [es]
galactosyltransferase, radiometric assay, activity, kinetic mechanism, sequential ordered mechanim, validation, histo-blood group, glycosyl transferases, alpha, specificity, udp-galactose-beta-galactoside-alpha-1,3-galactosyltransferase, galactosyltransferase, glycosyltransferases, recombinant, hydrolases, sequences
Identifikatorer
URN: urn:nbn:se:kth:diva-15335ISI: 000237566100025OAI: oai:DiVA.org:kth-15335DiVA, id: diva2:333376
Merknad
QC 20100525Tilgjengelig fra: 2010-08-05 Laget: 2010-08-05 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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