title: Amino acid sequence of the N-terminal region of human hemopexin.
abstract: Cyanogen bromide digestion of hemopexin at its 6 methionine residues results in 7 fragments (CB1-CB7) partially connected by disulfide bridges. By sequence studies of fragments CB1-CB4 and peptides prepared by their enzyme cleavage, a continuous amino acid sequence of the N-terminal region of human hemopexin, comprising 220 amino acid residues, was determined. The presence of intramolecular disulfide bonds, connecting half-cystine residues 126/130 and 165/170, was proved in fragments CB2 and CB3. Fragments CB1-CB4 include 5 sites, where hexosamine oligosaccharides are attached (positions 1,41,164,217 and probably 223). In the sequenced region two sites sensitive to acid hydrolysis--bonds ... Asp--Pro ... in positions 20/21 and 187/188 were found. In spite of the fact that pooled material of many donors was studied, no sequence heterogeneity was discovered.
mesh_terms: D000595:Amino Acid Sequence; D002236:Carbohydrate Conformation; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D003488:Cyanogen Bromide; D004220:Disulfides; D006466:Hemopexin; D006801:Humans; D009844:Oligosaccharides; D010446:Peptide Fragments
chemical_list: D004220:Disulfides; D009844:Oligosaccharides; D010446:Peptide Fragments; D006466:Hemopexin; D003488:Cyanogen Bromide