Modification of Galactose and N-acetylgalactosamine Residues by Oxidation of C-6 Hydroxyls to the Aldehydes Followed by Reductive Amination: Model Systems and Antifreeze Glycoproteins

Overview

Journal J Protein Chem

Specialties Biochemistry
Chemistry

Date 1989 Aug 1

PMID 2803515

Citations 3

Authors

D T OSUGA

M S Feather

M J Shah

R E FEENEY

Affiliations

Soon will be listed here.

Abstract

Amino acids and peptides have been attached to the C-6 hydroxyls of the galactose and the N-acetylgalactosamine by first oxidizing the C-6 hydroxyls to the aldehydes by galactose oxidase in the presence of small amounts of catalase, followed by reductive amination (alpha-amino group) in the presence of cyanoborohydride. The activity of oxidized antifreeze glycoprotein was greater than 70% of the original, and considerable activity has been retained with some substitutions on reductive amination using cyanoborohydride. The following were some activities retained (as compared with the oxidized antifreeze glycoprotein): Gly, 64; (Gly)2, 88; (Gly)3, 82; (Gly)4, 70; Gly-Gly-NH2, 44; Gly-Glu, 13; Gly-Leu, 40; Gly-Tyr, 57; Gly-Gly-Leu, 50; Gly-Gly-Phe, 30; and Gly-Gly-Val, 35. On amino acid analysis of acid hydrolysates, some release of the amino acid attached by amination occurred; e.g., Gly-Tyr gave 0.26 Gly and 0.49 Tyr per disaccharide.

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