Molecular Cloning and Expression of a Functional Snake Venom Serine Proteinase, with Platelet Aggregating Activity, from the Cerastes cerastes Viper
Autor: | Cassian Bon, Anne Wisner, Hafedh Dekhil, Habib Karoui, Naziha Marrakchi, Mohamed El Ayeb |
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Přispěvatelé: | Laboratoire des Venins et Toxines, Institut Pasteur de Tunis, Institut Pasteur de Tunis, Réseau International des Instituts Pasteur (RIIP)-Réseau International des Instituts Pasteur (RIIP), Venins, Institut Pasteur [Paris], This work was supported by Secretariat d’Etat a la Recherche Scientifique et Technique PNM Grant P95/SP27GH and by Comite Mixte Franco-Tunisien pour la Cooperation Universitaire Grant 96/F09023., We gratefully acknowledge Professor Koussay Dellagi for his constant interest in this work and for his helpful encouragement. We thank Dr. Ben Lasfar Zakaria, from the Serpentarium of Institut Pasteur de Tunis, for providing C. cerastes snakes and venoms., Institut Pasteur [Paris] (IP) |
Rok vydání: | 2003 |
Předmět: |
Models
Molecular Platelet Aggregation MESH: Sequence Homology Amino Acid [SDV]Life Sciences [q-bio] MESH: Viperidae MESH: Rabbits Venom MESH: Amino Acid Sequence MESH: Base Sequence Biochemistry MESH: Fibrinolysis MESH: Recombinant Proteins MESH: Thrombin Serine Viperidae MESH: Animals MESH: Serine Endopeptidases Cloning Molecular Peptide sequence MESH: Platelet Aggregation 0303 health sciences MESH: Kinetics biology Fibrinolysis Serine Endopeptidases 030302 biochemistry & molecular biology Thrombin Recombinant Proteins Snake venom Rabbits MESH: Viper Venoms MESH: Models Molecular medicine.drug DNA Complementary Molecular Sequence Data Cerastocytin Viper Venoms 03 medical and health sciences biology.animal medicine Animals MESH: Cloning Molecular Amino Acid Sequence 030304 developmental biology MESH: Molecular Sequence Data Base Sequence Sequence Homology Amino Acid Fibrinogen MESH: DNA Complementary Cerastes cerastes biology.organism_classification Molecular biology Kinetics MESH: Fibrinogen |
Zdroj: | Biochemistry Biochemistry, American Chemical Society, 2003, 42 (36), pp.10609-10618. ⟨10.1021/bi034790b⟩ Biochemistry, 2003, 42 (36), pp.10609-10618. ⟨10.1021/bi034790b⟩ |
ISSN: | 1520-4995 0006-2960 |
DOI: | 10.1021/bi034790b |
Popis: | International audience; The venoms of Viperidae snakes contain numerous serine proteinases that have been recognized to possess one or more of the essential activities of thrombin on fibrinogen and platelets. Among them, a platelet proaggregant protein, cerastocytin, has been isolated from the venom of the Tunisian viper Cerastes cerastes. Using the RACE-PCR technique, we isolated and identified the complete nucleotide sequence of a cDNA serine proteinase precursor. The recombinant protein was designated rCC-PPP (for C. cerastes platelet proaggregant protein), since its deduced amino acid sequence is more than 96% identical to the partial polypeptide sequences that have been determined for natural cerastocytin. The structure of the rCC-PPP cDNA is similar to that of snake venom serine proteinases. The expression of rCC-PPP in Escherichia coli system allowed, for the first time, the preparation and purification of an active protein from snake venom with platelet proaggregant and fibrinogenolytic activities. Purified rCC-PPP efficiently activates blood platelets at nanomolar (8 nM) concentrations, as do natural cerastocytin (5 nM) and thrombin (1 nM). It is able to clot purified fibrinogen and to hydrolyze alpha-chains. Thus, rCC-PPP could be therefore considered a cerastocytin isoform. By comparison with other snake venom serine proteinases, a Gly replaces the conserved Cys(42). This implies that rCC-PPP lacks the conserved Cys(42)-Cys(58) disulfide bridge. A structural analysis performed by molecular modeling indicated that the segment of residues Tyr(67)-Arg(80) of rCC-PPP corresponds to anion-binding exosite 1 of thrombin that is involved in its capacity to induce platelet aggregation. Furthermore, the surface of the rCC-PPP molecule is characterized by a hydrophobic pocket, comprising the 90 loop (Phe(90)-Val(99)), Tyr(172), and Trp(215) residues, which might be involved in the fibrinogen clotting activity of rCC-PPP. |
Databáze: | OpenAIRE |
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