title: Amino acid sequence of human myelin basic protein peptide 45-89 as determined by mass spectrometry.
abstract: In order to resolve the uncertainties about the primary structure of human myelin basic protein at residues 45-89, the sequence of this peptide and its tryptic fragments were reinvestigated by fast atom bombardment mass spectrometry. The sequence at positions 77-78 was found to be His-Gly and the sequence at positions 83-84 was shown to be Glu-Asn. The Ser at position 56 was not phosphorylated, whereas the residue at position 46 or 47 showed a heterogeneity of Gly and Ser in this peptide fragment in one of two protein preparations from different patients. These results demonstrate the usefulness of fast atom bombardment mass spectrometry for primary structure information. The corrected sequence of human basic protein peptide 45-89 will permit a more detailed immunochemical analysis of this peptide and its in vivo degradation products.
mesh_terms: D000595:Amino Acid Sequence; D001923:Brain Chemistry; D002851:Chromatography, High Pressure Liquid; D006801:Humans; D008297:Male; D013058:Mass Spectrometry; D004676:Myelin Basic Protein; D010446:Peptide Fragments / Q000032:analysis; D014357:Trypsin
chemical_list: D004676:Myelin Basic Protein; D010446:Peptide Fragments; C041031:myelin basic protein 45-89; D014357:Trypsin