1
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Canton T, Böhme GA, Boireau A, Bordier F, Mignani S, Jimonet P, Jahn G, Alavijeh M, Stygall J, Roberts S, Brealey C, Vuilhorgne M, Debono MW, Le Guern S, Laville M, Briet D, Roux M, Stutzmann JM, Pratt J. RPR 119990, a novel alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid antagonist: synthesis, pharmacological properties, and activity in an animal model of amyotrophic lateral sclerosis. J Pharmacol Exp Ther 2001; 299:314-22. [PMID: 11561094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023] Open
Abstract
Alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) glutamate receptor antagonists are of potential interest for the treatment of certain acute and chronic neurodegenerative diseases, including amyotrophic lateral sclerosis. Here, we describe the synthesis and pharmacological properties of 9-carboxymethyl-4-oxo-5H,10H-imidazo[1,2-a]indeno[1,2-e]pyrazin-2-phosphonic acid (RPR 119990). The compound displaced [3H]AMPA from rat cortex membranes with a K(i) of 107 nM. In oocytes expressing human recombinant AMPA receptors, RPR 119990 depressed ion flux with a K(B) of 71 nM. The antagonist properties of this compound were confirmed on rat native AMPA receptors in cerebella granule neurons in culture and in hippocampal slices where it antagonized electrophysiological responses with IC50 values of 50 and 93 nM, respectively. RPR 119990 antagonized hippocampal evoked responses in vivo, demonstrating brain penetration at active concentrations. RPR 119990 is a potent anticonvulsant in the supramaximal electroshock in the mouse with an ED50 of 2.3 mg/kg 1 h post s.c. administration, giving it a workably long action. Pharmacokinetic studies show good passage into the plasma after subcutaneous administration, whereas brain penetration is low but with slow elimination. This compound was found active in a transgenic mouse model of familial amyotrophic lateral sclerosis (SOD1-G93A) where it was able to improve grip muscle strength and glutamate uptake from spinal synaptosomal preparations, and prolong survival with a daily dose of 3 mg/kg s.c.
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Affiliation(s)
- T Canton
- Aventis Pharma S.A., Neurodegenerative Disease Group, Vitry-Sur-Seine Cedex, France
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2
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Stutzmann JM, Bohme GA, Boireau A, Damour D, Debono MW, Genevois-Borella A, Jimonet P, Pratt J, Randle JC, Ribeill Y, Vuilhorgne M, Mignani S. Synthesis of anticonvulsive AMPA antagonists. Bioorg Med Chem Lett 2001; 11:1205-10. [PMID: 11354378 DOI: 10.1016/s0960-894x(01)00180-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The overstimulation of excitatory amino acid receptors such as the glutamate AMPA receptor has been implicated in the physiopathogenesis of epilepsy as well as in acute and chronic neurodegenerative disorders. An original series of readily water soluble 4-oxo-10-substituted-imidazo[1,2-a]indeno[1,2-e]pyrazin-2-carboxylic acid derivatives was synthesized. The most potent derivative 6a exhibited nanomolar binding affinity (IC50 = 35nM) and antagonist activity (IC50 = 6nM) at ionotropic AMPA receptor. This compound also demonstrated potent anticonvulsant properties in MES in mice and rats with long durations of action with ED50 values in the 1-3 mg/kg dose range following ip and iv administration.
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Affiliation(s)
- J M Stutzmann
- Aventis Pharma S.A., Centre de Recherche de Vitry-Alfortville, Vitry-sur-Seine, France
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3
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Jimonet P, Bohme GA, Bouquerel J, Boireau A, Damour D, Debono MW, Genevois-Borella A, Hardy JC, Hubert P, Manfré F, Nemecek P, Pratt J, Randle JC, Ribeill Y, Stutzmann JM, Vuilhorgne M, Mignani S. Bioisosteres of 9-carboxymethyl-4-oxo-imidazo[1,2-a]indeno-[1,2-e]pyrazin-2-carboxylic acid derivatives. Progress towards selective, potent in vivo AMPA antagonists with longer durations of action. Bioorg Med Chem Lett 2001; 11:127-32. [PMID: 11206442 DOI: 10.1016/s0960-894x(00)00592-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
A novel series of 2- and 9-disubstituted heterocyclic-fused 4-oxo-indeno[1,2-e]pyrazin derivatives was synthesized. One of them, the 9-(1H-tetrazol-5-ylmethyl)-4-oxo-5,10-dihydroimidazo[1,2-a]indeno[1,2-e]pyrazin-2-yl phosphonic acid 4i exhibited a strong and a selective binding affinity for the AMPA receptor (IC50 = 13 nM) and demonstrated potent antagonist activity (IC50 = 6nM) at the ionotropic AMPA receptor. This compound also displayed good anticonvulsant properties against electrically-induced convulsions after ip and iv administration with ED50 values between 0.8 and 1 mg/kg. Furthermore, a strong increase in potency was observed when given iv 3 h before test (ED50 = 3.5 instead of 25.6 mg/kg for the corresponding 9-carboxymethyl-2-carboxylic acid analogue). These data confirmed that there is an advantage in replacing the classical carboxy substituents by their bioisosteres such as tetrazole or phosphonic acid groups.
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Affiliation(s)
- P Jimonet
- Aventis Pharma S.A., Centre de Recherche de Vitry-Alfortville, Vitry-sur-Seine, France
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4
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Pratt J, Jimonet P, Bohme GA, Boireau A, Damour D, Debono MW, Genevois-Borella A, Randle JC, Ribeill Y, Stutzmann JM, Vuilhorgne M, Mignani S. Synthesis and potent anticonvulsant activities of 4-oxo-imidazo[1,2-a]inden. Bioorg Med Chem Lett 2000; 10:2749-54. [PMID: 11133083 DOI: 10.1016/s0960-894x(00)00561-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The over-stimulation of excitatory amino acid receptors such as the glutamate AMPA receptor has been suggested to be associated with neurodegenerative disorders. Here we describe an original series of readily water soluble 4-oxo-imidazo[1,2-a] indeno[1,2-e]pyrazin-8- and -9-carboxylic (acetic) acid derivatives. One of these compounds, 4f, exhibited nanomolar binding affinity, potent competitive antagonism at the ionotropic AMPA receptor and a long duration of anticonvulsant activity after administration by parenteral route in vivo.
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Affiliation(s)
- J Pratt
- Aventis Pharma S.A., Centre de Recherche de Vitry-Alfortville, Vitry-sur-Seine, France
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5
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Jimonet P, Chevé M, Bohme GA, Boireau A, Damour D, Debono MW, Genevois-Borella A, Imperato A, Pratt J, Randle JC, Ribeill Y, Stutzmann JM, Vuilhorgne M, Mignani S. 8-Methylureido-10-amino-10-methyl-imidazo[1,2-a]indeno[1,2-e] pyrazine-4-ones: highly in vivo potent and selective AMPA receptor antagonists. Bioorg Med Chem 2000; 8:2211-7. [PMID: 11003165 DOI: 10.1016/s0968-0896(00)00161-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Water soluble 8-methylureido-10-amino-10-methyl-imidazo[1,2-a]indeno[1,2-e]pyraz ine-4-one 4 represents a novel class of highly potent and selective AMPA receptors antagonists with in vivo activity. The dextrorotatory isomer (+)-4 was found to display the highest affinity with an IC50 of 10 nM. It also exhibited very good anticonvulsant effects after i.p., s.c. and i.v. administration in mice subjected to electrical convulsions (MES) and i.p. in audiogenic seizure-e in DBA/2 mice (ED50's < or = 10 mg/kg).
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Affiliation(s)
- P Jimonet
- Aventis Pharma S.A., Centre de Recherche de Vitry-Alfortville, Vitry-sur-Seine, France
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6
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Stutzmann JM, Bohme GA, Boireau A, Damour D, Debono MW, Genevois-Borella A, Imperato A, Jimonet P, Pratt J, Randle JC, Ribeill Y, Vuilhorgne M, Mignani S. 4,10-Dihydro-4-oxo-4H-imidazo[1,2-a]indeno[1,2-e]pyrazin-2-carboxylic acid derivatives: highly potent and selective AMPA receptors antagonists with in vivo activity. Bioorg Med Chem Lett 2000; 10:1133-7. [PMID: 10843235 DOI: 10.1016/s0960-894x(00)00181-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
A novel series of 2-substituted-4,5-dihydro-4-oxo-4H-imidazo[1,2-a]indeno[1,2-e]pyrazine derivatives was synthesised. One of them, 4e-a highly water soluble compound exhibited a nanomolar affinity and demonstrated competitive antagonist properties at the ionotropic AMPA receptors. This compound also displayed potent anticonvulsant properties against electrically or sound-induced convulsions in mice after systemic administration, thus suggesting adequate brain penetration.
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Affiliation(s)
- J M Stutzmann
- Aventis Pharma S.A., Centre de Recherche de Vitry-Alfortville, Vitry-sur-Seine, France
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7
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Mignani S, Bohme GA, Boireau A, Cheve M, Damour D, Debono MW, Genevois-Borella A, Imperato A, Jimonet P, Pratt J, Randle JC, Ribeill Y, Vuilhorgne M, Stutzmann JM. 8-Methylureido-4,5-dihydro-4-oxo-10H-imidazo[1,2-a]indeno[1,2-e]pyrazines: highly potent in vivo AMPA antagonists. Bioorg Med Chem Lett 2000; 10:591-6. [PMID: 10741560 DOI: 10.1016/s0960-894x(00)00054-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
A novel series of readily water soluble 8-methylureido-4,5-dihydro-4-oxo-10H-imidazo[1,2-a]indeno[1,2-e]++ +pyrazines were synthesized. The -10-yl acetic acid ((+)-3) and -10-carboxylidene (4) derivatives exhibit potent affinities (IC50=4 and 19 nM, respectively) and antagonist properties (IC50 = 2 and 3 nM, respectively) at the ionotropic AMPA receptor. These compounds also display anticonvulsant properties against both electrically and sound-induced convulsions in mice after ip, sc and iv administration with ED50 values between 0.9 and 11 mg/kg, thus suggesting adequate brain penetration.
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Affiliation(s)
- S Mignani
- Rhône-Poulenc S.A., Rhône-Poulenc Rorer, Centre de Recherche de Vitry-Alfortville, Vitry-sur-Seine, France.
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8
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Combeau C, Provost J, Lancelin F, Tournoux Y, Prod'homme F, Herman F, Lavelle F, Leboul J, Vuilhorgne M. RPR112378 and RPR115781: two representatives of a new family of microtubule assembly inhibitors. Mol Pharmacol 2000; 57:553-63. [PMID: 10692496 DOI: 10.1124/mol.57.3.553] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
A screening program aimed at the discovery of new antimicrotubule agents yielded RPR112378 and RPR115781, two natural compounds extracted from the Indian plant Ottelia alismoides. We report their isolation, structural determination, and mechanisms of action. RPR112378 is an efficient inhibitor of tubulin polymerization (IC(50) = 1.2 microM) and is able to disassemble preformed microtubules. Regarding tubulin activity, RPR115781 is 5-fold less active than RPR112378. Tubulin-RPR112378 complexes, when isolated by gel filtration, were able to block further tubulin addition to growing microtubules, a mechanism that accounts for the substoichiometric effect of the drug. RPR112378 was found to prevent colchicine binding but not vinblastine binding to tubulin. Although colchicine binding is known to induce an increase of tubulin GTPase activity, no such increase was observed with RPR112378. We show that RPR112378 is a highly cytotoxic compound and that RPR115781 is 10, 000-fold less active as an inhibitor of KB cell growth. Part of the cytotoxicity of RPR112378 is probably caused by a reaction of addition with sulfhydryl groups, an observation that has not been made with RPR115781. In conclusion, these molecules represent a new class of inhibitors of microtubule assembly with potential therapeutic value.
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Affiliation(s)
- C Combeau
- Rhône-Poulenc Rorer S.A., Centre de Recherche de Vitry-Alfortville, Vitry-Sur-Seine, France.
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9
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Damour D, Pulicani JP, Vuilhorgne M, Mignani S. cis- and trans-3-(3-Indolyl)proline Derivatives as Conformationally Restricted Analogues of Tryptophan. Synlett 1999. [DOI: 10.1055/s-1999-2708] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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10
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Damour D, Barreau M, Fardin V, Dhaleine F, Vuilhorgne M, Mignani S. 1,3-Dipolar Cycloaddition Reactions of 4-Silacyclohex(hept)-2-en-1-one Derivatives: Synthesis of Novel Azasilabicyclic Compounds. Synlett 1998. [DOI: 10.1055/s-1998-1588] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Abstract
Salmon calcitonin (sCT), a 32-amino-acid peptide, is the active component in many pharmaceuticals used for the management of bone diseases. The degradation pathways of sCT were determined, and the structures of the major degradation products were identified. Aqueous solutions of sCT at pH values of 3, 4, 5, and 6 were degraded, and the major degradation products were detected using reversed phase and size-exclusion high-performance liquid chromatography (HPLC). The degradation rate and pathways of sCT are strongly dependent on pH in the pH range between 3 and 6. The major degradation products were isolated by semipreparative HPLC and identified using a variety of spectroscopic and bioanalytical techniques. The results show that sCT can undergo hydrolyses resulting in cleavage of the 1-2 amide bond and deamidation of the Gln14 and Gln20 residues, sulfide exchange that leads to an unusual trisulfide derivative, and dimerization to reducible and nonreducible dimers. The mechanisms for the pathways can be rationalized from known degradation pathways of peptide and proteins.
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Affiliation(s)
- V Windisch
- Rhone-Poulenc Rorer, Collegeville, PA 19426, USA
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12
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Rivory LP, Riou JF, Haaz MC, Sable S, Vuilhorgne M, Commerçon A, Pond SM, Robert J. Identification and properties of a major plasma metabolite of irinotecan (CPT-11) isolated from the plasma of patients. Cancer Res 1996; 56:3689-94. [PMID: 8706009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Irinotecan [7-ethyl-10-[4-(1-piperidino)-1-piperidino]carbonyloxycamptothecin (CPT-11)] is a promising water-soluble analogue of camptothecin [S. Sawada et al., Chem. & Pharm. Bull. (Tokyo), 39: 1446-1454, 1991]. We have reported previously the presence of an important polar metabolite, in addition to 7-ethyl-10-hydroxycamptothecin (SN-38) beta-glucuronide, in samples of plasma taken from patients undergoing treatment with CPT-11 (L.P. Rivory and J. Robert, Cancer Chemother. Pharmacol. 36: 176-179, 1995; L. P. Rivory and J. Robert, J. Cromatogr., 661: 133-141, 1994). Plasma samples (0.5 ml) containing comparatively large amounts of this metabolite were extracted by solid-phase columns and subjected to high-performance liquid chromatography and mass spectrometry in parallel to fluorometric detection. The metabolite yielded [M + 1] ions with a m/z of 619, representing the addition of 32 atomic mass units to CPT-11. Purified fractions were subjected to proton nuclear magnetic resonance, and the structure determined, 7-ethyl-10-[4-N-(5-aminopentanoic acid)-1-piperidino]carbonyloxycampothecin (APC), was further validated following synthesis. Like CPT-11, APC was found to be only a weak inhibitor of the cell growth of KB cells in culture (IC50, 2.1 versus 5.5 micrograms/ml for CPT-11 and 0.01 microgram/ml for SN-38, the active metabolite of CPT-11) and was a poor inducer of topoisomerase I DNA-cleavable complexes (100-fold less potent than SN-38). In contrast to CPT-11, APC was not hydrolyzed to SN-38 by human liver microsomes or purified human liver carboxylesterase. Furthermore, APC did not inhibit the hydrolysis of CPT-11 in these preparations. Interestingly, APC was only a weak inhibitor of acetylcholinesterase in comparison to CPT-11 and neostigmine. It appears likely, therefore, that APC does not contribute directly to the activity and toxicity profile of CPT-11 in vivo.
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Affiliation(s)
- L P Rivory
- University of Queensland, Department of Medicine, Princess Alexandra Hospital, Woolloongabba, Australia
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13
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Paris JM, Francois J, Molherat C, Albano F, Robin M, Vuilhorgne M, Barriere JC. Unusual transformation of the 3-hydroxy-picolinoyl residue of pristinamycin IA. J Antibiot (Tokyo) 1995; 48:676-82. [PMID: 7649868 DOI: 10.7164/antibiotics.48.676] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Pristinamycin IA was modified in a two-step procedure to give original derivatives possessing a tricyclic nucleus (8a, 8b, 8c) or a substituted pyrrole ring (10a, 10b) in place of the natural exocyclic 3-hydroxy-picolinoyl residue. This transformation involved firstly preparation of pyridinium betaines 5 from pristinamycin IA and secondly a 1-3 dipolar cycloaddition between 5 and N-substituted maleimides or diethyl acetylenedicarboxylate. The compounds obtained were evaluated as antibacterial agents alone and in association with pristinamycin IIA.
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Affiliation(s)
- J M Paris
- Rhône-Poulenc Rorer S.A., Centre de Recherche de Vitry-Alfortville, Vitry sur Seine, France
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14
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Van der Pyl D, Cans P, Debernard JJ, Herman F, Lelievre Y, Tahraoui L, Vuilhorgne M, Leboul J. RPR113228, a novel farnesyl-protein transferase inhibitor produced by Chrysosporium lobatum. J Antibiot (Tokyo) 1995; 48:736-7. [PMID: 7649878 DOI: 10.7164/antibiotics.48.736] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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15
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Faure G, Choumet V, Bouchier C, Camoin L, Guillaume J, Monegier B, Vuilhorgne M, Bon C. The origin of the diversity of croloxin isoforms in the venom of Crotalus durissus terrificus. Toxicon 1995. [DOI: 10.1016/0041-0101(95)99367-c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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16
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Clerc FF, Monégier B, Faucher D, Cuiné F, Pourcet C, Holt JC, Tang SY, Van Dorsselaer A, Becquart J, Vuilhorgne M. Primary structure control of recombinant proteins using high-performance liquid chromatography, mass spectrometry and microsequencing. J Chromatogr B Biomed Appl 1994; 662:245-59. [PMID: 7719480 DOI: 10.1016/0378-4347(94)00184-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The conformity of two recombinant proteins (a von Willbrand factor fragment and human serum albumin, consisting of respectively 289 and 585 amino acids) has been examined by HPLC combined with mass spectrometry and microsequencing, on both intact material and fragment peptides obtained by proteolytic cleavage. These studies confirmed that the primary structure of the recombinant proteins corresponds to that predicted from their gene, particularly the integrity of their N and C termini, and, in the case of albumin, the agreement between the observed disulfide bond pattern and the published model. Furthermore, the structure of an albumin-related compound could be elucidated. Application of LC-MS for batch-to-batch quality control is also under discussion.
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Affiliation(s)
- F F Clerc
- Rhône-Poulenc Rorer S.A., Centre de Recherches de Vitry-Alfortville, Vitry sur Seine, France
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17
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Affiliation(s)
- M. Vuilhorgne
- Rhône-Poulenc Rorer, Centre de Recherche de Vitry-Alfortville, 13 Quai Jules Guesde, F-94400 Vitry sur Seine, France
| | - C. Gaillard
- Rhône-Poulenc Rorer, Institute de BioPharmacie, 20 Avenue Raymond Aron, F-92165 Antony, France
| | - G. J. Sanderink
- Rhône-Poulenc Rorer, Institute de BioPharmacie, 20 Avenue Raymond Aron, F-92165 Antony, France
| | - I. Royer
- Centre National de la Recherche Scientifique, Laboratoire de Pharmacologie et de Toxicologie Fondamentales, 205 route de Narbonne, F-31400 Toulouse, France
| | - B. Monsarrat
- Centre National de la Recherche Scientifique, Laboratoire de Pharmacologie et de Toxicologie Fondamentales, 205 route de Narbonne, F-31400 Toulouse, France
| | - J. Dubois
- Centre National de la Recherche Scientifique, Institut de Chimie des Substances Naturelles, F-91190 Gif-sur-Yvette, France
| | - M. Wright
- Centre National de la Recherche Scientifique, Laboratoire de Pharmacologie et de Toxicologie Fondamentales, 205 route de Narbonne, F-31400 Toulouse, France
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18
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Faure G, Choumet V, Bouchier C, Camoin L, Guillaume JL, Monegier B, Vuilhorgne M, Bon C. The origin of the diversity of crotoxin isoforms in the venom of Crotalus durissus terrificus. Eur J Biochem 1994; 223:161-4. [PMID: 8033889 DOI: 10.1111/j.1432-1033.1994.tb18978.x] [Citation(s) in RCA: 89] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Crotoxin, the main toxin from the venom of the South American rattlesnake Crotalus durissus terrificus, is a beta-neurotoxin which consists of the non-covalent association of two subunits: a phospholipase A2 subunit B (CB), and a non-enzymic subunit A (CA). We have previously purified and characterized several isoforms of each subunit of crotoxin in the venom collected from numerous snakes. Furthermore, three cDNAs encoding two CB isoforms and the precursor, pro-CA, of subunit A have been isolated from a cDNA library prepared from a single venom gland of Crotalus durissus terrificus. The aim of this study is to analyse an individual snake venom from an animal that has been used to construct a cDNA library. Several isoforms of subunit A and two isoforms of subunit B were isolated and compared to purified and characterized subunit isoforms from pooled venom. The result of this study showed that the multiplicity and the diversity of crotoxin isoforms result from post-translational modifications occurring on a precursor and from the expression of different messenger RNAs present in an individual snake. It allowed for the identification of the two CB isoforms encoding cDNAs expressed in the individual venom with two isoforms from pooled venom, CBc and probably CBa2, that belong to two classes of crotoxin complexes which can be distinguished biochemically and pharmacologically.
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Affiliation(s)
- G Faure
- Unité des Venins, Institut Pasteur, Paris, France
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19
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20
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Fréchet D, Guitton JD, Herman F, Faucher D, Helynck G, Monegier du Sorbier B, Ridoux JP, James-Surcouf E, Vuilhorgne M. Solution structure of RP 71955, a new 21 amino acid tricyclic peptide active against HIV-1 virus. Biochemistry 1994; 33:42-50. [PMID: 8286361 DOI: 10.1021/bi00167a006] [Citation(s) in RCA: 72] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The structure of RP 71955, a new tricyclic 21 amino acid peptide active against human immunodeficiency virus 1, was determined. Its amino acid composition was inferred from the results of fast atom bombardment mass spectrometry, nuclear magnetic resonance, Raman spectroscopy, and amino acid analysis. Its sequence could not be determined classically, using Edman degradation, given the lack of a free terminal NH2. It was deduced from the interpretation of interresidue nuclear Overhauser effects and confirmed by the sequencing of peptides obtained by limited chemical hydrolysis. It was found to be CLGIGSCNDFAGCGYAVVCFW. An internal amide bond between the NH2 of C1 and the gamma-COOH of D9 was observed, as well as two disulfide bridges, one between C1 and C13 and one between C7 and C19. The three-dimensional structure of RP 71955 was determined from nuclear magnetic resonance derived constraints using distance geometry, restrained molecular dynamics, nuclear Overhauser effect back calculation, and an iterative refinement using a full relaxation matrix approach. Analogies between the structure of RP 71955 and some functional domains of gp41, the transmembrane protein of human immunodeficiency virus 1, suggest hypotheses concerning the mode of action of RP 71955.
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Affiliation(s)
- D Fréchet
- Rhône-Poulenc Rorer S.A., Vitry-Sur-Seine, France
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21
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Largeron M, Vuilhorgne M, Potier I, Auzeil N, Bacqué E, Paris J, Fleury M. Electrochemical reduction of pristinamycin IA and related streptogramins in aqueous acidic medium. Tetrahedron 1994. [DOI: 10.1016/s0040-4020(01)80650-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Fréchet D, Danzer M, Debu F, du Sorbier B, Reisdorf D, Snozzi C, Vuilhorgne M. Structure elucidation of RP 63834 a new macrocyclic lactone antibiotic. Tetrahedron 1991. [DOI: 10.1016/0040-4020(91)80008-p] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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23
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24
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El-Masry S, Vuilhorgne M, Evans FJ. Sesquiterpene Lactones from Aegialophila pumila. Planta Med 1984; 50:115. [PMID: 17340274 DOI: 10.1055/s-2007-969644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Cnicin was isolated as the major sesquiterpene lactone from Aegialophila pumila Jus. Boiss. The germacranolide salonitenolide was isolated as a minor constituent. Cnicin demonstrated pronounced cytotoxic activity when tested in vitro against TLX-5 mice lymphoma cells.
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Affiliation(s)
- S El-Masry
- Department of Pharmacognosy, Faculty of Pharmacy, University of Alexandria, Egypt
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25
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Vuilhorgne M, Ennifar S, Das BC, Paschal JW, Nagarajan R, Hagaman EW, Wenkert E. Structure analysis of the nucleoside disaccharide antibiotic anthelmycin by carbon-13 nuclear magnetic resonance spectroscopy. A structural revision of hikizimycin and its identity with anthelmycin. J Org Chem 1977; 42:3289-91. [PMID: 903851 DOI: 10.1021/jo00440a019] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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