1983/05/01 by Robert Garlick, J S Mazer · 5 citations
Biochemistry, Genetics and Molecular Biology · Chemistry · Medicine · #Affinity chromatography #Albumin #Amino acid #Biochemistry #Biology #Chemistry #Chromatography #Enzyme #Erythrocyte Function and Pathophysiology #Glycosylation #Hemoglobin structure and function #Human serum albumin #In vivo #Lysine #Mass Spectrometry Techniques and Applications #Peptide #Serum albumin #Trypsin
paper · doi:10.1016/s0021-9258(18)32384-6
openalex publication_date 1983/05/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We have determined the major site of nonenzymatic glycosylation of human serum albumin in vivo. This was accomplished by reacting freshly purified human serum albumin with sodium [3H]borohydride followed by aminoethylation and tryptic digestion. The tryptic peptides were separated into a soluble fraction which contained 88% of the total 3H radioactivity and an insoluble fraction. In order to isolate the 3H-labeled glycosylated peptides, the soluble tryptic peptide fraction was first subjected to boronic acid affinity chromatography. Cation exchange chromatography then separated the soluble glycosylated peptides into a major peak which contained 48% of the total recovered 3H radioactivity and a number of minor peptide fractions. The amino acid composition of the major peptide was: Thr, Glu2, Ala, Val2, Leu2, Lys, lysino-1-deoxysorbitol. In accord with the primary structure of human serum albumin, this amino acid composition corresponds precisely to residues 525-534. Glucitol-lysine, the NH2-terminal residue of this peptide, is totally resistant to cleavage by trypsin. Thus, lysine-525 is the predominant site of nonenzymatic glycosylation of human serum albumin in vivo. Chromatography on GlycoGel B boronic acid affinity gel indicates that 10-12% of normal serum albumin is glycosylated. The rate of nonenzymatic glycosylation of this protein in vivo is approximately 9 times that of human hemoglobin.