title: Evidence for the covalent binding of SHAP, heavy chains of inter-alpha-trypsin inhibitor, to hyaluronan.
abstract: We previously showed that serum-derived 85-kDa proteins (SHAPs, serum-derived hyaluronan associated proteins) are firmly bound to hyaluronan (HA) synthesized by cultured fibroblasts. SHAPs were then identified to be the heavy chains of inter-alpha-trypsin inhibitor (ITI) (Huang, L., Yoneda, M., and Kimata, K. (1993) J. Biol. Chem. 268, 26725-26730). In this study, the SHAP.HA complex was isolated from pathological synovial fluid from human arthritis patients. The SHAP.HA complex was digested with thermolysin, followed by CsCl gradient centrifugation. The HA-containing fragments thus obtained were further digested with chondroitinase AC II and subjected to TSK gel high performance liquid chromatography (HPLC). Peptide-HA disaccharide-containing fractions (the SHAP.HA binding regions) were further purified by reverse phase HPLC. Major peaks were analyzed by protein sequencing and mass spectrometry (electrospray ionization mass spectrometry and collision induced dissociation-MS/MS). By comparison with the reported C-terminal sequences of the human ITI family, the peptides were found to correspond to tetrapeptides derived from the C termini of heavy chains 1 of and 2 of inter-alpha-trypsin inhibitor (HC1 and HC2), and heavy chain 3 of pre-alpha-trypsin inhibitor (HC3), respectively, and a heptapeptide from HC1. Mass spectrometric analyses suggested that the C-terminal Asp of each heavy chain was esterified to the C6-hydroxyl group of an internal N-acetylglucosamine of HA chain. This report is the first demonstration to give evidence for the covalent binding of proteins to HA.
authors.affiliation: Institute for Molecular Science of Medicine, Aichi Medical University, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Zhao
authors.forename: M
authors.initials: M
authors.lastname: Yoneda
authors.forename: Y
authors.initials: Y
authors.lastname: Ohashi
authors.forename: S
authors.initials: S
authors.lastname: Kurono
authors.forename: H
authors.initials: H
authors.lastname: Iwata
authors.forename: Y
authors.initials: Y
authors.lastname: Ohnuki
authors.forename: K
authors.initials: K
authors.lastname: Kimata
mesh_terms: D000510:Alpha-Globulins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D000595:Amino Acid Sequence; D001665:Binding Sites; D002478:Cells, Cultured; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D004591:Electrophoresis, Polyacrylamide Gel; D005347:Fibroblasts / Q000378:metabolism; D019791:Guanidine; D006146:Guanidines; D006801:Humans; D006820:Hyaluronic Acid / Q000096:biosynthesis / Q000302:isolation & purification / Q000378:metabolism*; D046911:Macromolecular Substances; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010003:Osteoarthritis / Q000378:metabolism*; D011485:Protein Binding; D013583:Synovial Membrane / Q000378:metabolism; D014361:Trypsin Inhibitors / Q000378:metabolism
chemical_list: D000510:Alpha-Globulins; D006146:Guanidines; D046911:Macromolecular Substances; D014361:Trypsin Inhibitors; C011877:inter-alpha-inhibitor; D006820:Hyaluronic Acid; D019791:Guanidine