Donor substrate specificity of recombinant human blood group A, B and hybrid A/B glycosyltransferases expressed in Escherichia coli

Autor:	Saran A. Narang, Catherine A. Compston, David R. Bundle, Monica M. Palcic, Nina O.L. Seto, Stephen V. Evans
Rok vydání:	2001
Předmět:	chemistry.chemical_classification biology medicine.disease_cause Biochemistry Group A Molecular biology Amino acid law.invention carbohydrates (lipids) Enzyme Antigen chemistry law Glycosyltransferase biology.protein medicine Recombinant DNA Enzyme kinetics Escherichia coli
Zdroj:	European Journal of Biochemistry. 259:770-775
ISSN:	0014-2956
DOI:	10.1046/j.1432-1327.1999.00086.x
Popis:	The human blood group A and B glycosyltransferases catalyze the transfer of GalNAc and Gal, to the (O)H-precursor structure Fucα(1–2)Galβ-OR to form the blood group A and B antigens, respectively. Changing four amino acids (176, 235, 266 and 268) alters the specificity from an A to a B glycosyltransferase. A series of hybrid blood group A/B glycosyltransferases were produced by interchanging these four amino acids in synthetic genes coding for soluble forms of the enzymes and expressed in Escherichia coli. The purified hybrid glycosyltransferases were characterized by two-substrate enzyme kinetic analysis using both UDP-GalNAc and UDP-Gal donor substrates. The A and B glycosyltransferases were screened with other donor substrates and found to also utilize the unnatural donors UDP-GlcNAc and UDP-Glc, respectively. The kinetic data demonstrate the importance of a single amino acid (266) in determining the A vs. B donor specificity.
Databáze:	OpenAIRE
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