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Pinto M, Rougeot C, Gracia L, Rosa M, Garcı́a A, Arsequell G, Valencia G, Centeno NB. Proposed Bioactive Conformations of Opiorphin, an Endogenous Dual APN/NEP Inhibitor. ACS Med Chem Lett 2012; 3:20-4. [PMID: 24900367 DOI: 10.1021/ml200182v] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Accepted: 11/17/2011] [Indexed: 11/28/2022] Open
Abstract
The conformational profiles for the endogenous peptide Opiorphin and a set of seven analogues exhibiting different inhibitory activities toward human aminopeptidase N (hAPN) and human neprilysin (hNEP) were independently computed to deduce a bioactive conformation that Opiorphin may adopt when binding these two enzymes. The conformational space was thoroughly sampled using an iterative simulated annealing protocol, and a library of low-energy conformers was generated for each peptide. Bioactive Opiorphin conformations fitting our experimental structure-activity relationship data were identified for hAPN and hNEP using computational pairwise comparisons between each of the unique low-energy conformations of Opiorphin and its analogues. The obtained results provide a structural explanation for the dual hAPN and hNEP inhibitory activity of Opiorphin and show that the inborn flexibility of Opiorphin is essential for its analgesic activity.
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Affiliation(s)
- Marta Pinto
- Computer-Assisted Drug Design
Laboratory, Research Programme on Biomedical Informatics (GRIB), IMIM-Universitat Pompeu Fabra, Dr. Aiguader 88, E-08003
Barcelona, Spain
| | - Catherine Rougeot
- Institut Pasteur−Unité de Biochimie Structurale et Cellulaire/URA2185−CNRS, 25 rue du Docteur Roux, 75724 Paris Cedex 15, France
| | - Luis Gracia
- Department of Physiology and Biophysics, Weill Cornell Medical College, 1300 York Avenue, New
York, New York 10065, United States
| | - Mònica Rosa
- Unit of Glycoconjugate Chemistry, Instituto de Química Avanzada de Catalunya (IQAC−CSIC), Jordi Girona
18-26, E-08034 Barcelona, Spain
| | - Andrés Garcı́a
- Computer-Assisted Drug Design
Laboratory, Research Programme on Biomedical Informatics (GRIB), IMIM-Universitat Pompeu Fabra, Dr. Aiguader 88, E-08003
Barcelona, Spain
| | - Gemma Arsequell
- Unit of Glycoconjugate Chemistry, Instituto de Química Avanzada de Catalunya (IQAC−CSIC), Jordi Girona
18-26, E-08034 Barcelona, Spain
| | - Gregorio Valencia
- Unit of Glycoconjugate Chemistry, Instituto de Química Avanzada de Catalunya (IQAC−CSIC), Jordi Girona
18-26, E-08034 Barcelona, Spain
| | - Nuria B. Centeno
- Computer-Assisted Drug Design
Laboratory, Research Programme on Biomedical Informatics (GRIB), IMIM-Universitat Pompeu Fabra, Dr. Aiguader 88, E-08003
Barcelona, Spain
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Pérez JA, Cantó J, Reig F, Pérez JJ, Haro I. Conformational behavior of the HAV-VP3(110-121) peptidic sequence and synthetic analogs in membrane environments studied by CD and computational methods. Biopolymers 1998; 45:479-92. [PMID: 9577229 DOI: 10.1002/(sici)1097-0282(199806)45:7<479::aid-bip2>3.0.co;2-l] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The present study was undertaken to examine the structural features that may be important to explain the immunogenicity of the (110-121) peptide sequence (FWRGDLVFDFQV) of VP3 capsid protein of hepatitis A virus. A conformational analysis of the preferred conformations by CD and molecular mechanics was carried out. Present results suggest that the interaction with liposomes as biomembrane model induces and stabilizes the amphipathic beta-structure of the peptide. To study the contribution of amino acid replacements at the RGD tripeptide as well as the influence of the peptide chain length on peptide conformation, solid-phase peptide synthesis of several peptide analogs was carried out and the peptide conformation was studied using CD spectroscopy. The results show that the RGD sequence is necessary to induce the beta-structure in the presence of liposomes.
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Affiliation(s)
- J A Pérez
- Departament de Química de Pèptids i Proteïnes, CID, CSIC, Barcelona, Spain
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Canto J, Perez JA, Centeno NB, Haro I, Perez JJ. Conformational study of the preferred conformations of the peptide sequence VP3(110–121) of HAV by circular dichroism and molecular mechanics. Int J Pept Res Ther 1997. [DOI: 10.1007/bf02443550] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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