title: Characterization of an apparently lower molecular weight gamma-chain variant in fibrinogen Kyoto I. The replacement of gamma-asparagine 308 by lysine which causes accelerated cleavage of fragment D1 by plasmin and the generation of a new plasmin cleavage site.
abstract: Congenitally abnormal fibrinogen Kyoto I with impaired fibrin monomer polymerization contains a normal gamma-chain and a gamma-chain variant (gamma Kyoto I) that has an apparently lower Mr on sodium dodecyl sulfate-polyacrylamide gel electrophoresis in the Laemmli system (Laemmli, U. K. (1970) Nature 227, 680-685) but migrates with apparently normal Mr in the Weber and Osborn system (Weber, K., and Osborn, M. (1969) J. Biol. Chem. 244, 4406-4412). Reverse-phase high performance liquid chromatographic analyses of the cyanogen bromide or lysyl endopeptidase cleavage fragments of the purified gamma-chains of fibrinogen Kyoto I showed the presence of peptides not seen from normal fibrinogen. Amino acid sequence analysis of these peptides indicated that gamma Asn308 of the gamma-chain variant is replaced by lysine. Purified fragment D1 of fibrinogen Kyoto I also contains two types of D1 gamma-remnants: normal and apparently lower Mr types. Abnormal fragment D1 is cleaved faster to fragments D2 and D3 by plasmin in the presence of [ethylenebis(oxyethylenenitrilo)]tetraacetic acid (EGTA) than normal fragment D1, as analyzed by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, followed by immunoblotting using anti-gamma-chain monoclonal antibody. Analysis of peptides released from fragment D1 by plasmin in the presence of EGTA demonstrated the cleavage of the gamma Lys308-Gly309 bond. Fragment D1 of fibrinogen Kyoto I has normal calcium binding properties. The data suggest that a region or conformation containing gamma Asn308 affects the polymerization of fibrin monomers and that the gamma Asn308----Lys replacement causes a conformational change in the gamma-chain which results in the accelerated cleavage of gamma Lys356-Ala357 and gamma Lys302-Phe303 bonds by plasmin and also results in the generation of a new plasmin cleavage site between Lys308 and Gly309 in the presence of EGTA. During these studies, we found that part of the gamma Lys212-Glu213 bond in fragment D1 is cleaved by plasmin in the presence of EGTA.
authors.affiliation: Institute of Hematology, Jichi Medical School, Tochigi, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Yoshida
authors.forename: S
authors.initials: S
authors.lastname: Terukina
authors.forename: M
authors.initials: M
authors.lastname: Okuma
authors.forename: M
authors.initials: M
authors.lastname: Moroi
authors.forename: N
authors.initials: N
authors.lastname: Aoki
authors.forename: M
authors.initials: M
authors.lastname: Matsuda
mesh_terms: D000595:Amino Acid Sequence; D001216:Asparagine; D002118:Calcium / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D003488:Cyanogen Bromide; D004533:Egtazic Acid / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D005338:Fibrin Fibrinogen Degradation Products / Q000378:metabolism*; D005340:Fibrinogen / Q000235:genetics / Q000378:metabolism*; D015241:Fibrinogens, Abnormal; D005341:Fibrinolysin / Q000378:metabolism*; D014644:Genetic Variation; D006801:Humans; D008239:Lysine; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010446:Peptide Fragments / Q000378:metabolism; D012697:Serine Endopeptidases / Q000378:metabolism
chemical_list: D005338:Fibrin Fibrinogen Degradation Products; D015241:Fibrinogens, Abnormal; D010446:Peptide Fragments; C011468:fibrinmonomer; C015214:fibrinogen D fragment; C057132:fibrinogen Kyoto I; D004533:Egtazic Acid; D001216:Asparagine; D005340:Fibrinogen; D012697:Serine Endopeptidases; C036813:lysyl endopeptidase; D005341:Fibrinolysin; D008239:Lysine; D003488:Cyanogen Bromide; D002118:Calcium