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Masmudi-Martín M, Zhu L, Sanchez-Navarro M, Priego N, Casanova-Acebes M, Ruiz-Rodado V, Giralt E, Valiente M. Brain metastasis models: What should we aim to achieve better treatments? Adv Drug Deliv Rev 2021; 169:79-99. [PMID: 33321154 DOI: 10.1016/j.addr.2020.12.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2020] [Revised: 11/16/2020] [Accepted: 12/04/2020] [Indexed: 02/07/2023]
Abstract
Brain metastasis is emerging as a unique entity in oncology based on its particular biology and, consequently, the pharmacological approaches that should be considered. We discuss the current state of modelling this specific progression of cancer and how these experimental models have been used to test multiple pharmacologic strategies over the years. In spite of pre-clinical evidences demonstrating brain metastasis vulnerabilities, many clinical trials have excluded patients with brain metastasis. Fortunately, this trend is getting to an end given the increasing importance of secondary brain tumors in the clinic and a better knowledge of the underlying biology. We discuss emerging trends and unsolved issues that will shape how we will study experimental brain metastasis in the years to come.
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Lo Re D, Montagner D, Tolan D, Di Sanza C, Iglesias M, Calon A, Giralt E. Increased immune cell infiltration in patient-derived tumor explants treated with Traniplatin: an original Pt(iv) pro-drug based on Cisplatin and Tranilast. Chem Commun (Camb) 2018; 54:8324-8327. [PMID: 29796549 DOI: 10.1039/c8cc02071j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Elevated intra-tumoral immune infiltrate is associated with an improved prognosis in cancer of distinct origins. Traniplatin (TPT) is a novel platinum(iv) pro-drug based on Cisplatin (CDDP) and the marketed drug Tranilast. When compared in vitro to Cisplatin, TPT showed increased cytotoxic activity against colon and lung cancer cells but decreased activity against immune cells. In addition, TPT efficiency was evaluated in tumor explants derived from colorectal cancer samples from patients subjected to intended curative surgery. TPT induced strong intra-tumoral cytotoxic activity yet was associated with an elevated presence of immune cell infiltrate, suggesting a reduced cytotoxic activity against immune cells in colorectal cancer.
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Affiliation(s)
- Daniele Lo Re
- Institute for Research in Biomedicine (IRB Barcelona), C/Baldiri Reixac 10, Barcelona, E-08028, Spain.
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Muñoz-Cano R, Ribó P, Araujo G, Giralt E, Sanchez-Lopez J, Valero A. Severity of allergic rhinitis impacts sleep and anxiety: results from a large Spanish cohort. Clin Transl Allergy 2018; 8:23. [PMID: 30002811 PMCID: PMC6036679 DOI: 10.1186/s13601-018-0212-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 05/19/2018] [Indexed: 01/04/2023] Open
Abstract
Background Allergic rhinitis (AR) is a highly prevalent disease that generates high social and health care costs and also has a significant effect on quality of life and quality of sleep. It has also been related to some psychological disorders like anxiety or depression.
Objective To evaluate anxiety, depression, and quality of sleep and life alteration in a group of patients with perennial AR compared to a group of seasonal AR patients. Methods Six-hundred seventy adults (> 18 years) with perennial and seasonal AR were recruited consecutively in 47 centers in Spain. Individuals were grouped in “Perennial” and “Seasonal” according to the seasonality of their symptoms. Anxiety, depression, sleep quality and health related quality of life were evaluated using the Hospital Anxiety and Depression Scale, Medical Outcomes Study Sleep Scale (MOS Sleep Scale) and the Health-related quality of life questionnaire ESPRINT-15, respectively. Both groups of patients were evaluated in and out of the pollen season.
Results AR symptoms are related to worse quality of life and more anxiety and depression symptoms. Indeed, symptom severity also correlates with worse outcomes (quality of life, sleep and depression/anxiety) regardless allergen seasonality. Symptoms severity, compared with seasonality and persistence, is the most important factor related with more anxiety and depression and poor sleep. However, symptoms severity, persistence and seasonality are independently affecting the quality of life in patients with AR. Conclusions Although AR symptoms have a great impact on depression and anxiety symptoms, quality of life and quality of sleep in all AR patients, as expected, individuals with more severe AR seem to suffer more intensely their effects. Electronic supplementary material The online version of this article (10.1186/s13601-018-0212-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- R Muñoz-Cano
- 1Allergy Unit, Pneumology Department, Hospital Clinic, Universitat de Barcelona, ARADyAL, Barcelona, Spain.,2Institut d'Investigacions Biomèdiques August Pi i Sunyer, IDIBAPS, Barcelona, Spain
| | - P Ribó
- 1Allergy Unit, Pneumology Department, Hospital Clinic, Universitat de Barcelona, ARADyAL, Barcelona, Spain.,3Allergy Unit, Pneumology Department, Hospital Clinic, Universitat de Barcelona, CIBERES, Barcelona, Spain
| | - G Araujo
- 1Allergy Unit, Pneumology Department, Hospital Clinic, Universitat de Barcelona, ARADyAL, Barcelona, Spain.,2Institut d'Investigacions Biomèdiques August Pi i Sunyer, IDIBAPS, Barcelona, Spain
| | | | | | - A Valero
- 1Allergy Unit, Pneumology Department, Hospital Clinic, Universitat de Barcelona, ARADyAL, Barcelona, Spain.,3Allergy Unit, Pneumology Department, Hospital Clinic, Universitat de Barcelona, CIBERES, Barcelona, Spain
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Sánchez-Navarro M, Garcia J, Giralt E, Teixidó M. Using peptides to increase transport across the intestinal barrier. Adv Drug Deliv Rev 2016; 106:355-366. [PMID: 27155131 DOI: 10.1016/j.addr.2016.04.031] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 04/24/2016] [Accepted: 04/29/2016] [Indexed: 02/05/2023]
Abstract
The oral route is the preferred for the administration of drugs; however, it has some serious limitations. One of the main disadvantages is poor permeability across the intestinal barrier. Various approaches are currently being adopted to overcome this issue. In this review, we describe the alternatives that use peptides to enhance intestinal absorption. First, we define the various sources of peptide enhancers followed by the analysis of the absorption mechanism used. We then comment on the possible toxic effects derived from their use as permeation enhancers, as well as potential formulation strategies. Finally, the advantages and drawbacks of peptides as intestinal enhancers are examined.
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Villoslada P, Moreno B, Colafrancesco V, Giralt E, Teixido M, Frade JM, Messeguer A. Neurotrophin Peptidomimetics Activate TrkA/B Signaling and Display Neuroprotective Effects in Neuroinflammation and Neurodegeneration (P07.091). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p07.091] [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: 11/15/2022] Open
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Vila-Farrés X, Giralt E, Vila J. Update of peptides with antibacterial activity. Curr Med Chem 2012; 19:6188-6198. [PMID: 22978329] [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] [Received: 06/19/2012] [Revised: 09/05/2012] [Accepted: 09/10/2012] [Indexed: 06/01/2023]
Abstract
For many years a battle has been going on between bacteria and humans, with bacteria trying to survive against the antibiotics used by humans. Bacteria are found to be dominant in this battle since they can develop resistance. In fact, in the last decade multi-, extended- and pan-drug resistant bacteria have been isolated. On the other hand, the number of new antibiotics approved by the FDA has dramatically decreased during the last 20 years. Therefore, there is a desperate need for developing new types of antibacterial agents, where antimicrobial peptides may play an important role. This review provides an update of the recently identified antimicrobial peptides. Three valid approaches for developing a future antibacterial agent, as are the mechanisms of action as well as the in vitro and in vivo assays have been described in depth. In comparison to the antibacterial agents available at present, the targets for most of the antimicrobial peptides are not well known. However several proposals having been introduced for many antimicrobial peptides of different mechanisms of action, there still lies some uncertainty about their utility. Hundreds of antimicrobial peptides have been tested in vitro against all types of bacteria, but in this review we will highlight only those which have been tested against the most important Gram-positive and Gram-negative bacteria. The last step to get a potential antibiotic includes studies with an in vivo model. Therefore only antimicrobial peptides with good activity are tested that have been described in this review.
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Affiliation(s)
- X Vila-Farrés
- Barcelona Centre for International Health Research (CRESIB, Hospital Clínic - Universitat de Barcelona), Barcelona, Spain
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Roquer J, Cuadrado-Godia E, Rodríguez-Campello A, Jiménez-Conde J, Martínez-Rodríguez JE, Giralt E, Ois A. Serum cholesterol levels and survival after rtPA treatment in acute stroke. Eur J Neurol 2011; 19:648-54. [DOI: 10.1111/j.1468-1331.2011.03607.x] [Citation(s) in RCA: 6] [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: 01/29/2023]
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Vila-Farres X, Garcia de la Maria C, López-Rojas R, Pachón J, Giralt E, Vila J. In vitro activity of several antimicrobial peptides against colistin-susceptible and colistin-resistant Acinetobacter baumannii. Clin Microbiol Infect 2011; 18:383-7. [PMID: 21672084 DOI: 10.1111/j.1469-0691.2011.03581.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
At present, colistin is among the few antibiotics effective against Acinetobacter baumannii clinical isolates. However, in the last few years, colistin-resistant A. baumannii strains have been isolated. Therefore, antibiotics effective against these usually pan-resistant colistin-resistant A. baumannii strains are required. The main objective of this study was to analyse the activity of 15 peptides against colistin-susceptible and colistin-resistant A. baumannii. The MICs were determined by microdilution. Among these 15 antimicrobial peptides (AMPs), melittin, indolicidin and mastoparan showed good activity against both colistin-susceptible and colistin-resistant A. baumannii. Further studies of mastoparan with time-killing curves showed bactericidal activity at MIC ×8 for both colistin-susceptible and colistin-resistant A. baumannii. In conclusion, mastoparan may be a potential alternative for the treatment of colistin-resistant A. baumannii infections.
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Affiliation(s)
- X Vila-Farres
- Department of Clinical Microbiology, Hospital Clinic, School of Medicine, University of Barcelona, CRESIB/IDIBAPS, Barcelona, Spain
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Puente V, De Fabregues O, Oliveras C, Ribera G, Pont-Sunyer C, Vivanco R, Cucurella G, Giralt E, Delgado T, Garcia C, Seoane A, Campo R. Eighteen month study of continuous intraduodenal levodopa infusion in patients with advanced Parkinson's disease: Impact on control of fluctuations and quality of life. Parkinsonism Relat Disord 2010; 16:218-21. [DOI: 10.1016/j.parkreldis.2009.07.015] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2008] [Revised: 05/17/2009] [Accepted: 07/29/2009] [Indexed: 11/25/2022]
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del Pozo-Rodríguez A, Pujals S, Delgado D, Solinís MA, Gascón AR, Giralt E, Pedraz JL. A proline-rich peptide improves cell transfection of solid lipid nanoparticle-based non-viral vectors. J Control Release 2008; 133:52-9. [PMID: 18854203 DOI: 10.1016/j.jconrel.2008.09.004] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2008] [Revised: 09/04/2008] [Accepted: 09/04/2008] [Indexed: 12/16/2022]
Abstract
The aim of this work was to improve the transfection efficacy of solid lipid nanoparticle (SLN)-based non-viral vectors into ARPE-19 cells through the addition of Sweet Arrow Peptide (SAP). First, we prepared SAP-DNA complexes at ratios of at least 50:1, and then incorporated them into the SLNs. All formulations were able to protect DNA, and the peptide favoured the most bioactive form (supercoiled) of open circular DNA turns. In vitro transfection studies of the vectors containing the pCMS-EGFP plasmid in HEK293 and ARPE-19 cell lines revealed that incorporation of SAP led to greater transfection in both cell lines, although via different mechanisms. The presence of SAP in the formulations did not affect the viability of HEK293 or ARPE-19 cells. In HEK293 cells, SAP enabled greater uptake of the vectors, and an SAP to DNA ratio of 50:1 was sufficient for enhancing transfection. In contrast, in ARPE-19 cells, SAP induced a change in the dominant entrance mechanism, from clathrin endocytosis to caveolae/raft-dependent endocytosis, thereby decreasing use of the lysosomal pathway and consequently, reducing vector degradation. The extent to which SAP uses one mechanism or the other largely depends on its concentration in the formulation.
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Affiliation(s)
- A del Pozo-Rodríguez
- Pharmacy and Pharmaceutical Technology Laboratory, Pharmacy Faculty, University of the Basque Country (UPV-EHU), Paseo de la Universidad 7, 01006 Vitoria-Gasteiz, Spain
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Abstract
Proline-rich cell-penetrating peptides, particularly the SAP (sweet arrow peptide), (VRLPPP)(3), have been proposed to be useful intracellular delivery vectors, as a result of their lack of cytotoxicity combined with their capacity to be internalized by cells. A common limitation of the therapeutic use of peptides is metabolic instability. In general, peptides are quickly degraded by proteases upon entry into the bloodstream. The use of all-D-peptide derivatives is emerging as a fruitful strategy to circumvent this degradation problem. In this context, we report on the internalization behaviour, protease-resistance enhancement and self-assembly properties of an all-D version of SAP [(vrlppp)(3)]. The cellular uptake of (vrlppp)(3) was evaluated in an in vivo assay in mice. Both flow cytometry and confocal laser-scanning microscopy experiments showed that a carboxyfluoresceinated version of the molecule, carboxyfluorescein-(vrlppp)(3), is internalized rapidly in white blood cells and kidney cells. Significant fluorescence was also detected in other organs such as the spleen and the liver. Finally, the toxicity of (vrlppp)(3) was examined, and no significant differences in the main biochemical parameters nor in weight were detected compared with controls.
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Affiliation(s)
- S Pujals
- Institute for Research in Biomedicine (IRB), Barcelona Science Park, Josep Samitier 1-5, 08028 Barcelona, Spain
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Lamiri M, Bougrin K, Daou B, Soufiaoui M, Nicolas E, Giralt E. Microwave‐Assisted Solvent‐Free Regiospecific Synthesis of 5‐Alkylidene and 5‐Arylidenehydantoins. SYNTHETIC COMMUN 2006. [DOI: 10.1080/00397910600589007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- M. Lamiri
- a Laboratoire de Chimie des Plantes et de Synthèse Organique et Bio‐Organique , Université Mohammed V‐Agdal, Faculté des Sciences , Rabat, Morocco
| | - K. Bougrin
- a Laboratoire de Chimie des Plantes et de Synthèse Organique et Bio‐Organique , Université Mohammed V‐Agdal, Faculté des Sciences , Rabat, Morocco
| | - B. Daou
- a Laboratoire de Chimie des Plantes et de Synthèse Organique et Bio‐Organique , Université Mohammed V‐Agdal, Faculté des Sciences , Rabat, Morocco
| | - M. Soufiaoui
- a Laboratoire de Chimie des Plantes et de Synthèse Organique et Bio‐Organique , Université Mohammed V‐Agdal, Faculté des Sciences , Rabat, Morocco
| | - E. Nicolas
- b Department of Organic Chemistry , Universitat de Barcelona , Barcelona, Spain
| | - E. Giralt
- b Department of Organic Chemistry , Universitat de Barcelona , Barcelona, Spain
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Vila J, Sánchez-Céspedes J, Sierra JM, Piqueras M, Nicolás E, Freixas J, Giralt E. Antibacterial evaluation of a collection of norfloxacin and ciprofloxacin derivatives against multiresistant bacteria. Int J Antimicrob Agents 2006; 28:19-24. [PMID: 16781123 DOI: 10.1016/j.ijantimicag.2006.02.013] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2005] [Accepted: 02/03/2006] [Indexed: 11/19/2022]
Abstract
The objective of this study was to analyse an array of ciprofloxacin and norfloxacin derivatives in order to determine those with good activity against bacteria that already present fluoroquinolone resistance associated with mutations in the gyrA and/or parC genes. Four norfloxacin and 20 ciprofloxacin derivatives were synthesised and tested against quinolone-susceptible and -resistant Escherichia coli, Acinetobacter baumannii, Stenotrophomonas maltophilia and Staphylococcus aureus strains using a microdilution test. Among the derivatives, the 4-methyl-7-piperazine ciprofloxacin derivative showed a minimum inhibitory concentration for 50% of the organisms that was 16- and 8-fold lower than ciprofloxacin for A. baumannii and S. maltophilia, respectively. When the methyl group at position 4 in the piperazine ring was substituted by ethyl, butyl or heptyl groups, activity against A. baumannii steadily decreased. The 7-(4-methyl)-piperazine ciprofloxacin derivative (UB-8902) showed very good activity against these multiresistant microorganisms including A. baumannii and S. maltophilia.
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Affiliation(s)
- J Vila
- Servei de Microbiologia, Centre de Diagnòstic Biomèdic, Hospital Clinic, Villarroel 170, 08036 Barcelona, Spain.
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Abstract
Amino acid sequences and linear or head-to-tail cyclopeptides can be represented conveniently in one-line text formulae using the three-letter symbols. However, other - but nonetheless important - topologies of peptides are 'side chain-to-head (or tail)', 'backbone-to-backbone', 'side chain-to-side chain' cyclopeptides, 'side chain-to-side chain' connected peptide strands, and branched peptides (like peptide dendrimers). In general, such structures cannot be described using the three-letter symbols in one-line text: a chemical structure editor is required for symbolic representations according to the IUPAC-IUBMB recommendations. The aim of this contribution is to offer an unambiguous and general nomenclature system that enables researchers to represent all cyclic and branched homo- and hetero-detic peptides in a coherent manner in one-line text - as long as their as constituents can be represented in (three)-letter codes. The application of this new nomenclature would overcome the existing difficulties and provide a way to express complex situations in the shortest way in order to highlight more clearly the salient points in a given scientific communication.
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Affiliation(s)
- J Spengler
- Barcelona Biomedical Research Institute, Barcelona Science Park, University of Barcelona, 08028 Barcelona, Spain
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Fernández-Carneado J, Kogan MJ, Van Mau N, Pujals S, López-Iglesias C, Heitz F, Giralt E. Fatty acyl moieties: improving Pro-rich peptide uptake inside HeLa cells. ACTA ACUST UNITED AC 2005; 65:580-90. [PMID: 15885117 DOI: 10.1111/j.1399-3011.2005.00253.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.9] [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
In the field of drug delivery there has been a continuous study of powerful delivery systems to aid non permeable drugs in reaching their intracellular target. Among the systems explored are cell penetrating peptides (CPPs), which first garnered interest a decade ago when the interesting translocation properties of the pioneer CPPs Tat and Antp were described. A new family of CPPs has recently been described as non cytotoxic Pro-rich vectors with favorable profiles for internalization in HeLa cells. Fatty acyl moieties that can tune a peptide's interaction with the lipophilic environment of a cell membrane have been incorporated into the Pro-rich sequence. Improvements in cellular uptake of peptides modified with fatty acyl groups, as studied by confocal microscopy and flow cytometry, as well as the results obtained by the interaction of these peptides with a model dioleoylphosphatidylcholine (DOPC) membrane and transmission electron microscopy (TEM), illustrate the importance of the fatty acyl moieties for efficient internalization.
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Affiliation(s)
- J Fernández-Carneado
- Institut de Recerca Biomèdica de Barcelona, Parc Científic de Barcelona, Josep Samitier 1, E-08028 Barcelona, Spain
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Abstract
A library of peptides required for a project investigating the factors relevant for blood-brain barrier transport was synthesized on solid phase. As a result of the high N-methylamino acid content in the peptides, their syntheses were challenging and form the basis of the work presented here. The coupling of protected N-methylamino acids with N-methylamino acids generally occurs in low yield. (7-azabenzotriazol-1-yloxy)-tris(pyrrolidino)phosphonium hexafluorophosphate (PyAOP) or PyBOP/1-hydroxy-7-azabenzotriazole (HOAt), are the most promising coupling reagents for these couplings. When a peptide contains an acetylated N-methylamino acid at the N-terminal position, loss of Ac-N-methylamino acid occurs during trifluoroacetic acid (TFA) cleavage of the peptide from the resin. Other side reactions resulting from acidic cleavage are described here, including fragmentation between consecutive N-methylamino acids and formation of diketopiperazines (DKPs). The time of cleavage is shown to greatly influence synthetic results. Finally, high-performance liquid chromatography (HPLC) profiles of N-methyl-rich peptides show multiple peaks because of slow conversion between conformers.
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Affiliation(s)
- M Teixidó
- Institut de Recerca Biomèdica de Barcelona, Parc Científic de Barcelona, Josep Samitier, Barcelona, Spain
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Escobar-Díaz E, López-Martín EM, Hernández del Cerro M, Puig-Kroger A, Soto-Cerrato V, Montaner B, Giralt E, García-Marco JA, Pérez-Tomás R, Garcia-Pardo A. AT514, a cyclic depsipeptide from Serratia marcescens, induces apoptosis of B-chronic lymphocytic leukemia cells: interference with the Akt/NF-κB survival pathway. Leukemia 2005; 19:572-9. [PMID: 15744353 DOI: 10.1038/sj.leu.2403679] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [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: 11/09/2022]
Abstract
Clinical treatment of B-cell chronic lymphocytic leukemia (B-CLL) is limited by the progressive drug resistance and nonselectivity of most drugs towards malignant cells. Depsipeptides are present in certain bacteria and display potent antitumor activity. We have studied the effect of the novel cyclodepsipeptide AT514 (serratamolide) from Serratia marcescens on B-CLL cell viability. AT514 induced apoptosis of B-CLL cells from the 21 patients studied, as confirmed by Annexin-V binding and nuclei condensation, with an average IC50 of 13 microM. AT514 was effective in those B-CLL cases resistant to fludarabine, but had no effect on normal PBL. AT514 preferentially activated the intrinsic apoptotic pathway, as evidenced by loss of mitochondrial membrane potential, release of cytochrome c and activation of caspase-9 and -3, but not of caspase-8. Importantly, AT514 interfered with phosphatidylinositol-3 kinase and protein kinase C survival signals since it increased the apoptotic effect of LY294002 and Bisl inhibitors, and induced Akt dephosphorylation at Ser 473. AT514 also decreased NF-kappaB activity by dramatically reducing the levels of p65 in B-CLL. This was confirmed on functional assays using NF-kappaB-luc-transfected Raji cells and transgenic mice. Our results establish that AT514 induces apoptosis of primary B-CLL cells and could be useful for clinical treatment of this malignancy.
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Affiliation(s)
- E Escobar-Díaz
- Departamento de Inmunología, Centro de Investigaciones Biológicas, CSIC, Madrid, Spain
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Cruz M, Tusell JM, Grillo-Bosch D, Albericio F, Serratosa J, Rabanal F, Giralt E. Inhibition of beta-amyloid toxicity by short peptides containing N-methyl amino acids. ACTA ACUST UNITED AC 2004; 63:324-8. [PMID: 15049845 DOI: 10.1111/j.1399-3011.2004.00156.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [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: 11/28/2022]
Abstract
Single N-methyl amino acid-containing peptides related to the central hydrophobic region beta16-20 (Lys-Leu-Val-Phe-Phe) of the beta-amyloid protein are able to reduce the cytotoxicity of natural beta1-42 in PC12 cell cultures. N-methyl phenylalanine analogs yield statistically significant increments in cell viability (Student's t-test < 0.01%) and are nontoxic in the same assay. These promising results indicate that these peptide molecules could be a starting point for the development of potential therapeutic compounds for the treatment of Alzheimer's disease.
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Affiliation(s)
- M Cruz
- Institut de Recerca Biomèdica de Barcelona, Parc Científic de Barcelona-UB, Josep Samitier 1, 08028 Barcelona, Spain
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Gomes P, Giralt E, Ochoa W, Verdaguer N, Andreu D. Probing degeneracy in antigen-antibody recognition at the immunodominant site of foot-and-mouth disease virus. J Pept Res 2002; 59:221-31. [PMID: 11966979 DOI: 10.1034/j.1399-3011.2002.01959.x] [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] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Antigen-antibody binding is regarded as one of the most representative examples of specific molecular recognition in nature. The simplistic view of antigenic recognition in terms of a lock-and-key mechanism is obsolete, as it is evident that both antigens and antibodies are flexible and can undergo substantial mutual adaptation. This flexibility is the source of complexities such as degeneracy and nonadditivity in antigenic recognition. We have used surface plasmon resonance to study the effects of combining multiple amino acid replacements within the sequence of the antigenic GH loop of foot-and-mouth disease virus. Our aim was 2-fold: to explore the extent to which antigenic degeneracy can be extended in this particular case, and to search for potential nonadditive effects in introducing multiple amino acid replacements. Combined analysis of one such multiply substituted peptide by SPR, solution NMR and X-ray diffraction shows that antigenic degeneracy can be expected as long as residues directly interacting with the paratope are conserved and the peptide bioactive folding is unaltered.
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Affiliation(s)
- P Gomes
- Department of Organic Chemistry, University of Barcelona, Barcelona, Spain
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Fernandez-Santin JM, Munoz-Guerra S, Rodriguez-Galan A, Aymami J, Lloveras J, Subirana JA, Giralt E, Ptak M. Helical conformations in a polyamide of the nylon-3 family. Macromolecules 2002. [DOI: 10.1021/ma00167a013] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.2] [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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25
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Abstract
Kahalalide F, the only member of the family of peptides called kahalalides, isolated from the sacoglossan mollusc Elysia rufescens and the green alga Bryopsis sp., with important bioactivity, is in clinical trials for treatment of prostate cancer. An efficient solid-phase synthetic approach is reported. Kahalalide F presents several synthetic difficulties: (i) an ester bond between two beta-branched and sterically hindered amino acids; (ii) a didehydroamino acid; and (iii) a rather hydrophobic sequence with two fragments containing several beta-branched amino acids in a row, one of them terminated with a saturated aliphatic acid. The cornerstones of our strategy were (i) a quasiorthogonal protecting system with allyl, tert-butyl, fluorenyl, and trityl-based groups, (ii) azabenzotriazole coupling reagents, (iii) formation of the didehydroamino acid residue on the solid phase, and (iv) cyclization and final purification in solution. HPLC, high-field NMR, and biological activity studies showed that the correct stereochemistry of the natural product is that proposed by Rinehart et al. whereas the stereochemistry proposed by Scheuer et al. is that of a biologically less active diastereoisomer.
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Affiliation(s)
- A López-Macià
- Department of Organic Chemistry, University of Barcelona, 08028 Barcelona, Spain
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26
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Abstract
Marine organisms are a rich source of novel, biologically active compounds. Herein, the solid-phase total synthesis of trunkamide A, currently in preclinical trials, is presented. Trunkamide A contains a thiazoline heterocycle and two residues of Ser and Thr with the hydroxy function modified as reverse prenyl (rPr). Cornerstones of the synthesis are as follows: (i) solid-phase peptide chain elongation using a quasi-orthogonal protecting scheme with tert-butyl and fluorenyl based groups, on a chlorotrityl resin; (ii) concourse of HOAt-based coupling reagents; and (iii) cyclizations in solution. Furthermore, the following synthetic steps are discussed: (i) preparation of the reverse prenyl derivatives of Ser and Thr; (ii) introduction of precursor of thiazoline as a protected amino thionoacid derivative; and (iii) formation of the thiazoline ring with DAST. All these features make this strategy particularly suitable for the large-scale synthesis of trunkamide A and other peptides containing the same motifs.
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Affiliation(s)
- J M Caba
- The Department of Organic Chemistry, University of Barcelona, 08028 Barcelona, Spain
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27
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Bahbouhi B, Bendjennat M, Chiva C, Kogan M, Albericio F, Giralt E, Seidah NG, Bahraoui E. Inhibition of HIV-2(ROD) replication in a lymphoblastoid cell line by the alpha1-antitrypsin Portland variant (alpha1-PDX) and the decRVKRcmk peptide: comparison with HIV-1(LAI). Microbes Infect 2001; 3:1073-84. [PMID: 11709287 DOI: 10.1016/s1286-4579(01)01467-8] [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: 10/18/2022]
Abstract
We investigated the effects of alpha1-antitrypsine Portland variant (alpha1-PDX) and decanoylRVKRchloromethylketone (decRVKRcmk) on HIV-2(ROD) replication in the Jurkat lymphoblastoid cell line. To this end, cells were stably transfected with the alpha1-PDX (J-PDX) and used as targets for HIV-2(ROD) infection. Controls were prepared with the empty vector (J-pcDNA3). HIV-2(ROD) and HIV-1(LAI) replications were significantly inhibited and delayed in the presence of the alpha1-PDX protein. When decRVKRcmk was used at 35 microM, inhibition rates were 70-80% for HIV-2(ROD) and HIV-1(LAI), while total inhibition occurred at 70 microM. Control peptides consisting of decanoylRVKR and acetylYVADcmk had no effect. In the presence of the alpha1-PDX or the decRVKRcmk at 35 microM, the infectivity of HIV-2(ROD) and HIV-1(LAI) produced was 3-4-fold lower. Both molecules inhibited syncytium formation by HIV-2(ROD) and HIV-1(LAI) to a considerable extent. Finally, the inhibition of viral replication was correlated with the ability of the decRVKRcmk at 35 and 70 microM and of the alpha1-PDX, to inhibit the processing of envelope glycoprotein precursors. The alpha1-PDX protein and the decRVKRcmk peptide at 35 microM inhibited HIV-2 and HIV-1 to a similar level suggesting that identical or closely related endoproteases are involved in the maturation of their envelope glycoprotein precursors into surface and transmembrane glycoproteins. The significant inhibition observed with alpha1-PDX indicates that furin or furin-like endoproteases appear to play a major role in the maturation process.
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Affiliation(s)
- B Bahbouhi
- Laboratoire dimmuno-virologie, Université Paul Sabatier, Bât 4R3, UFR/SVT, 118, route de Narbonne, 31062 cedex, Toulouse, France.
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28
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Kogan MJ, Dalcol I, Gorostiza P, López-Iglesias C, Pons M, Sanz F, Ludevid D, Giralt E. Self-assembly of the amphipathic helix (VHLPPP)8. A mechanism for zein protein body formation. J Mol Biol 2001; 312:907-13. [PMID: 11580236 DOI: 10.1006/jmbi.2001.4999] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.9] [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]
Abstract
gamma-Zein, a maize storage protein with an N-terminal proline-rich repetitive domain (gamma-ZNPRD), is located at the periphery of protein bodies. This domain appears to be indispensable for the aggregation of the protein on the surface of the organelle. The peptide (VHLPPP)8, spanning the gamma-ZNPRD, adopts a polyproline II (PPII) conformation that gives an amphipathic helix different from the alpha-helix. We used atomic force microscopy to study the surface organisation of the octamer, and transmission electron microscopy to visualise aggregates of the peptide in aqueous solution. We consider two self-assembly patterns that take account of the observed features. The micellar one fits best with the experimental results presented. Moreover, we found that this peptide has properties associated with surfactants, and form micelles in solution. This spontaneous amphipathic arrangement of the gamma-ZNPRD suggests a mechanism of gamma-zein deposition inside maize protein bodies.
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Affiliation(s)
- M J Kogan
- Departament de Química Orgànica, Universitat de Barcelona, Martí i Franquès 1, Barcelona, 08028, Spain
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29
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Villén J, Borràs E, Schaaper WM, Meloen RH, Dávila M, Domingo E, Giralt E, Andreu D. Synthetic peptides as functional mimics of a viral discontinuous antigenic site. Biologicals 2001; 29:265-9. [PMID: 11851326 DOI: 10.1006/biol.2001.0310] [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: 11/22/2022] Open
Abstract
Functional reproduction of discontinuous antigenic site D of foot-and-mouth disease virus (FMDV) has been achieved by means of synthetic peptide constructions that integrate into a single molecule each of the three protein loops that define the antigenic site. The site D mimics are designed on the basis of the X-ray structure of FMDV type C-S8c1 with the aid of molecular dynamics, so that the five residues assumed to be involved in antigenic recognition are located on the same face of the molecule, exposed to solvent and defining a set of native-like distances and angles. The designed site D mimics are disulphide-linked heterodimers that consist of a larger unit containing VP2(71-84), followed by a polyproline module and by VP3(52-62), and a smaller unit corresponding to VP1(188-194). Guinea pig antisera to the peptides recognize the viral particle and compete with site D-specific monoclonal antibodies, while inoculation with a simple (non-covalently bound) admixture of the three VP1-VP3 sequences yields no detectable virus-specific serum conversion. Similar results have been reproduced in two cattle. Antisera to the peptides are also moderately neutralizing of FMDV in cell culture and partially protective of guinea pigs against challenge with the virus. These results demonstrate functional mimicry of the discontinuous site D by the peptides, which are therefore obvious candidates for a multicomponent peptide-based vaccine against FMDV.
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Affiliation(s)
- J Villén
- Department of Organic Chemistry, University of Barcelona, Martí i Franquès 1, E-08028 Barcelona, Spain
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30
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Cárdenas F, Thormann M, Feliz M, Caba JM, Lloyd-Williams P, Giralt E. Conformational analysis of dehydrodidemnin B (aplidine) by NMR spectroscopy and molecular mechanics/dynamics calculations. J Org Chem 2001; 66:4580-4. [PMID: 11421777 DOI: 10.1021/jo010123h] [Citation(s) in RCA: 11] [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: 11/30/2022]
Abstract
Dehydrodidemnin B (DDB or aplidine), a potent antitumoral natural product currently in phase II clinical trials, exists as an approximately 1:1 mixture of two slowly interconverting conformations. These are sufficiently long-lived so as to allow their resolution by HPLC. NMR spectroscopy shows that this phenomenon is a consequence of restricted rotation about the Pyr-Pro(8) terminal amide bond of the molecule's side chain. The same technique also indicates that the overall three-dimensional structures of both the cis and trans isomers of DDB are similar despite the conformational change. Molecular dynamics simulations with different implicit and explicit solvent models show that the ensembles of three-dimensional structures produced are indeed similar for both the cis and trans isomers. These studies also show that hydrogen bonding patterns in both isomers are alike and that each one is stabilized by a hydrogen bond between the pyruvyl unit at the terminus of the molecule's side chain and the Thr(6) residue situated at the junction betwen the macrocycle and the molecule's side chain. Nevertheless, each conformational isomer forms this hydrogen bond using a different pyruvyl carbonyl group: CO(2) in the case of the cis isomer and CO(1) in the case of the trans isomer.
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Affiliation(s)
- F Cárdenas
- Departament de Química Orgánica, Universitat de Barcelona, Martí i Franquès, 1-11, E-08028 Barcelona, Spain
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31
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Codina A, Vilaseca M, Tarragó T, Fernández I, Ludevid D, Giralt E. Location of disulfide bonds in mature alpha-L-fucosidase from pea. J Pept Sci 2001; 7:305-15. [PMID: 11461044 DOI: 10.1002/psc.323] [Citation(s) in RCA: 6] [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] [Received: 12/07/2000] [Accepted: 01/24/2001] [Indexed: 11/07/2022]
Abstract
Fuc-9 is the mature form of a vacuolar alpha-L-fucosidase enzyme which seems to play an important role in plant growth regulation. Fuc-9 is a 202-residue protein containing five Cys residues located at positions 64, 109, 127, 162 and 169. In this study, the disulfide structure of Fuc-9 was determined by MALDI-TOF mass spectrometry (MS), with minimal clean-up of the samples and at a nanomolar scale. Two strategies, based on a specific chemical cleavage (with 2-nitro-5-thiocyanobenzoic acid and alkaline conditions) at the Cys residues and modification of Cys residues by acrylamide/deuterium labeled acrylamide alkylation, were used. Using these methods, the disulfide pairings Cys64-Cys109 and Cys162-Cys169 could be established. The advantages and limitations of our experimental approach are discussed.
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Affiliation(s)
- A Codina
- Department of Organic Chemistry, University of Barcelona, Spain
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32
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Codina A, Fernández I, Giralt E, Martínez I, Ludevid D. Combined use of ESI-MS and UV diode-array detection for localization of disulfide bonds in proteins: application to an alpha-L-fucosidase of pea. J Pept Res 2001; 57:473-82. [PMID: 11437951 DOI: 10.1034/j.1399-3011.2001.00859.x] [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] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A simplified strategy is described for the assignment of disulfide bonds in proteins of medium to high molecular mass (10-30 kDa). The method combines the use of high-performance liquid chromatography coupled to electrospray ionization mass spectrometry (HPLC-ESI-MS) and HPLC with UV diode-array detection (HPLC diode array). The denatured protein is subjected to proteolysis and the peptide mixture is divided into three fractions: (i) underivatized peptides, (ii) ethylpyridylated peptides, and (iii) reduced and ethylpyridylated peptides. The three peptide ensembles are then subjected to chromatographic and spectroscopic analysis. A systematic methodology is described to analyze the large amount of data obtained. The method was applied to the localization of disulfide bonds in alpha-L-fucosidase from pea. The two disulfide bonds were located between residues Cys64 and Cys109 and between Cys162 and Cys169, while Cys127 was free.
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Affiliation(s)
- A Codina
- Department of Organic Chemistry, University of Barcelona, Barcelona, Spain
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33
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Gomes P, Giralt E, Andreu D. Antigenicity modulation upon peptide cyclization: application to the GH loop of foot-and-mouth disease virus strain C1-Barcelona. Vaccine 2001; 19:3459-66. [PMID: 11348711 DOI: 10.1016/s0264-410x(01)00047-0] [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: 11/18/2022]
Abstract
Foot-and-mouth disease virus (FMDV) isolate C(1)-Barcelona (or C-S30) includes four replacements within its immunodominant site (GH loop, residues 136-150 of capsid protein VP1, YTTSTRGDLAHVTAT), relative to reference strain C-S8c1 (YTASARGDLAHLTTT). Although one of the mutations in C-S30 (147Leu-->Val) is known to be detrimental for antibody recognition, reactivity of this isolate with the neutralizing monoclonal antibody (mAb) 4C4, raised against FMDV C1-Brescia (GH loop: YTASTRGDLAHLTAT), was indistinguishable from those of strains C-S8c1 or C1-Brescia. A structural interpretation for these somewhat striking findings is available, based on the observation that 15-residue peptides reproducing the C-S30 and C-S8c1 GH loops adopt very similar, quasi-circular, conformations in crystal complexes with 4C4. Nevertheless, surface plasmon resonance (SPR) kinetic analyses of the interactions between these peptides and three anti-GH loop mAbs have now revealed that the linear C-S30 peptides were less antigenic in solution than their C-S8c1 and C1-Brescia counterparts. We have, therefore, tried to modulate peptide antigenicity in solution by cyclization. Functional SPR and structural two dimensional proton nuclear magnetic resonance (2D-1H NMR) studies of both linear and cyclic peptide antigens are discussed here. Conformation seems to have an important role in peptide antigenicity, even when continuous (i.e. linear) antigenic sites are involved.
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Affiliation(s)
- P Gomes
- Department of Organic Chemistry, University of Barcelona, Martí i Franquès 1, E-08028, Barcelona, Spain
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34
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Marchetto R, Nicolás E, Castillo N, Bacardit J, Navia M, Vila J, Giralt E. Two short peptides including segments of subunit A of Escherichia coli DNA gyrase as potential probes to evaluate the antibacterial activity of quinolones. J Pept Sci 2001; 7:27-40. [PMID: 11245203 DOI: 10.1002/psc.292] [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: 11/08/2022]
Abstract
Quinolones constitute a family of compounds with a potent antibiotic activity. The enzyme DNA gyrase, responsible for the replication and transcription processes in DNA of bacteria, is involved in the mechanism of action of these drugs. In this sense, it is believed that quinolones stabilize the so-called 'cleavable complex' formed by DNA and gyrase, but the whole process is still far from being understood at the molecular level. This information is crucial in order to design new biological active products. As an approach to the problem, we have designed and synthesized low molecular weight peptide mimics of DNA gyrase. These peptides correspond to sequences of the subunit A of the enzyme from Escherichia coli, that include the quinolone resistance-determining region (positions 75-92) and a segment containing the catalytic Tyr-122 (positions 116-130). The peptide mimic of the non-mutated enzyme binds to ciprofloxin (CFX) only when DNA and Mg2+ were present (Kd = 1.6 x 10(-6) M), a result previously found with DNA gyrase. On the other hand, binding was reduced when mutations of Ser-83 to Leu-83 and Asp-87 to Asn-87 were introduced, a double change previously found in the subunit A of DNA gyrase from several CFX-resistant clinical isolates of E. coli. These results suggest that synthetic peptides designed in a similar way to that described here can be used as mimics of gyrases (topoisomerases) in order to study the binding of the quinolone to the enzyme-DNA complex as well as the mechanism of action of these antibiotics.
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Affiliation(s)
- R Marchetto
- Departament de Química Orgànica, Facultat de Química, Universitat de Barcelona, Barcelona, Spain
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35
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Gomes P, Giralt E, Andreu D. Molecular analysis of peptides from the GH loop of foot-and-mouth disease virus C-S30 using surface plasmon resonance: a role for kinetic rate constants. Mol Immunol 2000; 37:975-85. [PMID: 11395136 DOI: 10.1016/s0161-5890(01)00014-1] [Citation(s) in RCA: 6] [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: 11/17/2022]
Abstract
A foot-and-mouth disease virus (FMDV) field variant, isolate C-S30 (also named C(1)-Barcelona), is known to contain four changes within the main antigenic site A (GH loop of capsid protein VP1, residues 136-150), at least one of which (Leu147-->Val) involves a highly conserved position, critical for antibody recognition in the reference strain C-S8c1. However, immunoenzymatic analysis of FMDV C-S30 showed it was recognised by 4C4, a monoclonal antibody that specifically targets site A. This remarkable behaviour has led us to analyse the individual and combined contributions of the four mutations to the antigenicity of C-S30, by surface plasmon resonance (SPR) and enzyme-linked immunosorbent assay (ELISA) studies of pentadecapeptides displaying all possible combinations of the four replacements. Analysis of this family of C-S30-derived analogues shows a certain level of antibody recognition by SPR. In addition, SPR data suggest that kinetic rate constants provide an indirect measure, on the one hand, of paratope accessibility (association rate constant) and, on the other hand, of peptide fitness to the same paratope (dissociation rate constant).
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Affiliation(s)
- P Gomes
- Department of Organic Chemistry, University of Barcelona, Martí i Franquès 1, E-08028, Barcelona, Spain
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36
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Estiarte MA, Rubiralta M, Diez A, Thormann M, Giralt E. Oxazolopiperidin-2-ones as type II' beta-turn mimetics: synthesis and conformational analysis. J Org Chem 2000; 65:6992-9. [PMID: 11031021 DOI: 10.1021/jo000416v] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [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: 11/28/2022]
Abstract
We describe a straightforward synthesis of 9-substituted 3-aminooxazolidinopiperidin-2-ones 4. Some derivatives were prepared for use in peptide synthesis as rigidified surrogates of the Ala-Pro dipeptide. Analysis of the amide derivatives 14 by NMR experiments and molecular mechanics/dynamics calculations shows that the major isomer 14a has a stronger propensity than the minor isomer 14b to adopt beta-turn conformations, and the calculations indicate that in water 14a adopts a stable betaII' turn conformation.
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Affiliation(s)
- M A Estiarte
- Departament de Química Orgànica, Facultat de Química, Universitat de Barcelona, c/Martí i Franquès, 08028-Barcelona, Spain
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37
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Gomes P, Giralt E, Andreu D. Direct single-step surface plasmon resonance analysis of interactions between small peptides and immobilized monoclonal antibodies. J Immunol Methods 2000; 235:101-11. [PMID: 10675762 DOI: 10.1016/s0022-1759(99)00218-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [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: 11/15/2022]
Abstract
Surface plasmon resonance (SPR) methods have been optimized to permit direct kinetic analysis of the antigenic peptide analytes interacting with immobilized monoclonal antibodies (mAbs). High reproducibility and a significant correlation between SPR and previous ELISA data on the same set of antibodies and peptides were observed. The kinetic data obtained provide further insight into the structure of the main antigenic site of foot-and-mouth disease virus (FMDV).
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Affiliation(s)
- P Gomes
- Department of Organic Chemistry, University of Barcelona, Martí i Franquès 1-E-08028, Barcelona, Spain
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38
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Abstract
Electrospray ionization mass spectrometry has been used to investigate simple multicharged [1(4)]heterophanes containing heterocyclic betaine subunits as building blocks. The formation of stable noncovalent polymolecular self-assembled structures in the gas phase is reported.
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Affiliation(s)
- E Alcalde
- Laboratori de Química Orgánica, Facultat de Farmácia, Universitat de Barcelona, E-08028 Barcelona, Spain.
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39
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Abstract
Antigenic site A of foot-and-mouth disease virus (serotype C) has been reproduced by means of cyclic versions of peptide A15, YTASARGDLAHLTTT, corresponding to residues 136-150 of envelope protein VP1. A structural basis for the design of the cyclic peptides is provided by crystallographic data from complexes between the Fab fragments of anti-site A monoclonal antibodies and A15, in which the bound peptide is folded into a quasi-cyclic pattern. Head-to-tail cyclizations of A15 do not provide peptides of superior antigenicity. Internal disulfide cyclization, however, leads to analogs which are recognized as one to two orders of magnitude better than linear A15 in both ELISA and biosensor experiments. CD and NMR studies show that the best antigen, CTASARGDLAHLTT-Ahx-C (disulfide), is very insensitive to environment-induced conformational change, suggesting that cyclization helps to stabilize a bioactive-like structure.
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Affiliation(s)
- M L Valero
- Departament de Química Orgànica, Universitat de Barcelona, Barcelona, Spain
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40
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Gomes P, Giralt E, Andreu D. Surface plasmon resonance screening of synthetic peptides mimicking the immunodominant region of C-S8c1 foot-and-mouth disease virus. Vaccine 1999; 18:362-70. [PMID: 10506663 DOI: 10.1016/s0264-410x(99)00206-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.9] [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
The main antigenic site (site A) of foot-and-mouth disease virus (FMDV, strain C-S8c1) may be adequately reproduced by a 15-peptide with the amino acid sequence H-YTASARGDLAHLTTT-NH(2) (A15), corresponding to the residues 136-150 of the viral protein VP1. The effect of amino acid substitutions within A15 on its antigenicity towards monoclonal antibodies (MAb) raised against antigenic site A, has been studied by means of BIAcore technology, based on surface plasmon resonance (SPR). Although these antigenicities have previously been determined from enzyme-linked immunosorbent assays (ELISA), the SPR-based technique is superior in that it allows a fast and straightforward screening of antigens while simultaneously providing kinetic data of the antigen-antibody interaction. With a view to screening fairly large libraries of individual peptides, we have inverted the typical SPR experiment by immobilizing the MAb on the sensor surface and using peptides as soluble analytes. We report the validation of this approach through the screening of 44 site A peptides, with results generally in good agreement with the relative antigenicities previously determined by competition ELISA.
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Affiliation(s)
- P Gomes
- Department of Organic Chemistry, University of Barcelona, Martí i Franquès, 1; 08028, Barcelona, Spain
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41
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Abstract
DKP formation is a serious side reaction during the solid-phase synthesis of peptide acids containing either Pro or Gly at the C-terminus. This side reaction not only leads to a lower overall yield, but also to the presence in the reaction crude of several deletion peptides lacking the first amino acids. For the preparation of protected peptides using the Fmoc/tBu strategy, the use of a ClTrt-Cl-resin with a limited incorporation of the C-terminal amino acid is the method of choice. The use of resins with higher loading levels leads to more impure peptide crudes. The use of HPLC-ESMS is a useful method for analysing complex samples, such as those formed when C-terminal Pro peptides are prepared by non-optimized solid-phase strategies.
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Affiliation(s)
- C Chiva
- Department of Organic Chemistry, University of Barcelona, Spain
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42
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Abstract
Kaliotoxin (KTX), a potassium channel blocker found in the venom of the scorpion Androctonous Mauretanicus is a 38 residue polypeptide with a well defined structure consisting of a alpha-helix and a three strand antiparallel beta-sheet interconnected by three disulfide bonds. Although the 3D structure has been determined by NMR, there is a number of features, mainly concerning the conformation and flexibility of the side chains, but also the long range order in the peptide and its fluctuations, that may have escaped the experimental study. These questions are now being addressed using molecular dynamics (MD) simulations. Accordingly, the present work reports the analysis of a 430 ps molecular dynamics trajectory of the polypeptide soaked with 4700 TIP3 water molecules inside a 56 A box. MD calculations were performed with periodic boundary conditions. Analysis of the conformational space sampled by each of the residues along the trajectory, suggests a special behavior of Pro17 and Lys19 both located on the helix. Furthermore, analysis of the relative movements of the secondary structure elements indicates that the alpha-helix and beta-sheets fluctuate in a correlated motion, preserving the tertiary structure of the polypeptide along the trajectory. Finally, analysis of the charge distribution was also examined. The direction of the dipole moment, computed from the center of masses appears to be an interesting feature of the structure probably related to the biological function of the molecule.
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Affiliation(s)
- J Canto
- Departament d'Enginyeria Quimica, UPC ETS d'Enginyers Industrials, Barcelona, Spain
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43
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Valero ML, Giralt E, Andreu D. A comparative study of cyclization strategies applied to the synthesis of head-to-tail cyclic analogs of a viral epitope. J Pept Res 1999; 53:56-67. [PMID: 10195442 DOI: 10.1111/j.1399-3011.1999.tb01617.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A family of head-to-tail cyclic peptide models of the antigenic site A (G-H loop of viral protein 1) of foot-and-mouth disease virus has been designed on the basis of the three-dimensional structure adopted by the linear peptide YTASARGDLAHLTTT upon binding to neutralizing monoclonal antibodies. Three different methods of cyclization have been examined to access the peptides. Solution cyclization of a minimally protected linear precursor provided the expected products but required several purification steps that lowered the yields to approximately 10%. The two other approaches relied on side-chain anchoring of the peptide through the Asp residue and cyclization on the solid phase. A synthetic scheme combining Fmoc, tBu and OAI protections was practicable but inefficient when scaled-up. The combination of Boc, Bzl and OFm protections was more promising, but suffered from high epimerization during the initial esterification of Boc-Asp-OFm to benzyl alcohol-type resins. This problem was solved by performing the esterification via the cesium salt of Boc-Asp-OFm. With this improvement, the Boc/Bzl/OFm has become the method of choice for the preparation of cyclic head-to-tail peptides in satisfactory yields and with minimal purification.
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Affiliation(s)
- M L Valero
- Department of Organic Chemistry, University of Barcelona, Spain
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Verdaguer N, Sevilla N, Valero ML, Stuart D, Brocchi E, Andreu D, Giralt E, Domingo E, Mateu MG, Fita I. A similar pattern of interaction for different antibodies with a major antigenic site of foot-and-mouth disease virus: implications for intratypic antigenic variation. J Virol 1998; 72:739-48. [PMID: 9420281 PMCID: PMC109430 DOI: 10.1128/jvi.72.1.739-748.1998] [Citation(s) in RCA: 63] [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: 02/05/2023] Open
Abstract
The three-dimensional structures of the Fab fragment of a neutralizing antibody raised against a foot-and-mouth disease virus (FMDV) of serotype C1, alone and complexed to an antigenic peptide representing the major antigenic site A (G-H loop of VP1), have been determined. As previously seen in a complex of the same antigen with another antibody which recognizes a different epitope within antigenic site A, the receptor recognition motif Arg-Gly-Asp and some residues from an adjacent helix participate directly in the interaction with the complementarity-determining regions of the antibody. Remarkably, the structures of the two antibodies become more similar upon binding the peptide, and both undergo considerable induced fit to accommodate the peptide with a similar array of interactions. Furthermore, the pattern of reactivities of five additional antibodies with versions of the antigenic peptide bearing amino acid replacements suggests a similar pattern of interaction of antibodies raised against widely different antigens of serotype C. The results reinforce the occurrence of a defined antigenic structure at this mobile, exposed antigenic site and imply that intratypic antigenic variation of FMDV of serotype C is due to subtle structural differences that affect antibody recognition while preserving a functional structure for the receptor binding site.
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Affiliation(s)
- N Verdaguer
- Centre de Investigació i Desenvolupament (CSIC), Barcelona, Spain
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Affiliation(s)
- F Albericio
- Department of Organic Chemistry, University of Barcelona, Spain
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46
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Valero ML, Camarero JA, Adeva A, Verdaguer N, Fita I, Mateu MG, Domingo E, Giralt E, Andreu D. Cyclic peptides as conformationally restricted models of viral antigens: application to foot-and-mouth disease virus. Biomed Pept Proteins Nucleic Acids 1997; 1:133-40. [PMID: 9346844] [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] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Conformationally restricted cyclic peptide mimics of the antigenic site A of foot-and-mouth disease virus serotype C-S8c1 have been designed, first by comparison to the three-dimensional structure of the O1BFS serotype, later more accurately on the basis of X-ray diffraction data from a complex between a linear peptide reproducing site A and an FMDV-derived monoclonal antibody Fab fragment. A variety of cyclization strategies have been attempted, both in solution and in the solid phase, involving disulfide, side chain lactam and head-to-tail arrangements. Preliminary immunological results have shown one of the cyclic disulfide mimics to be a better immunogen than its linear counterpart.
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Affiliation(s)
- M L Valero
- Department of Organic Chemistry, University of Barcelona, Spain
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47
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Haack T, Sánchez YM, González MJ, Giralt E. Structural comparison in solution of a native and retro peptide derived from the third helix of Staphylococcus aureus protein A, domain B: retro peptides, a useful tool for the discrimination of helix stabilization factors dependent on the peptide chain orientation. J Pept Sci 1997; 3:299-313. [PMID: 9262649 DOI: 10.1002/(sici)1099-1387(199707)3:4%3c299::aid-psc121%3e3.0.co;2-b] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A peptide fragment corresponding to the third helix of Staphylococcus Aureus protein A, domain B, was chosen to study the effect of the main-chain direction upon secondary structure formation and stability, applying the retro-enantio concept. For this purpose, two peptides consisting of the native (Ln) and reversed (Lr) sequences were synthesized and their conformational preferences analysed by CD and NMR spectroscopy. A combination of CD and NMR data, such as molar ellipcitity. NOE connectivities, H alpha and NH chemical shifts, 3J alpha N coupling constants and amide temperature coefficients indicated the presence of nascent helices for both Ln and Lr in water, stabilized upon addition of the fluorinated solvents TFE and HFIP. Helix formation and stabilization appeared to be very similar in both normal and retro peptides, despite the unfavourable charge-macrodipole interactions and bad N-capping in the retro peptide. Thus, these helix stabilization factors are not a secondary structure as determined for this specific peptide. In general, the synthesis and confirmational analysis of peptide pairs with opposite main-chain directions, normal and retro peptides, could be useful in the determination of secondary structure stabilization factors dependent on the direction.
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Affiliation(s)
- T Haack
- Department of Organic Chemistry, University of Barcelona, Spain
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48
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Abstract
Kaliotoxin (KTX) is a natural peptide blocker of voltage-dependent K+ channels. The 3D structure of a truncated analogue of KTX (Fernandez et al. (1994) Biochemistry 33, 14256-14263) was determined by NMR spectroscopy and showed significant differences from structures established for other related scorpion toxins. A recent publication with the structure of the complete toxin (Aiyar et al. (1995) Neuron 15, 1169-1181) did not confirm these differences. In this communication we report NMR data for KTX at pH 3.0, 5.5 and 7.2 and the 3D structure obtained from data at pH = 5.5. Complete KTX displays a folding similar to that of other toxins with an alpha-helix and a beta-sheet linked by two disulphide bonds. The pKa of His 34 is anomalously low (4.7-5.2 depending on the buffer) owing to its interaction with two Lys residues (including the essential Lys 27), the charged N-terminus and the side chain of Met 29. Charged residues are placed symmetrically with respect to an axis that approximately coincides with one of the principal components of the moment of inertia of the toxin. His 34, which occupies a well-defined position between two conserved Cys, is located on the centre of a layer of charged groups. Positively and negatively charged residues are found at the same position in related toxins. It is suggested that electrostatic effects modulate the distances between positive charges in flexible side chains, contributing to the fine tuning of the selectivity toward different channel subclasses and that the approximate coincidence between the moment of inertia and the charge axis facilitate the approach of the toxin to the channel. The very low pKa of His 34 implies that it will be completely unprotonated at physiological pH.
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Affiliation(s)
- M Gairí
- Departament de Química Orgànica, Universitat de Barcelona, Spain
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Haack T, Camarero JA, Roig X, Mateu MG, Domingo E, Andreu D, Giralt E. A cyclic disulfide peptide reproduces in solution the main structural features of a native antigenic site of foot-and-mouth disease virus. Int J Biol Macromol 1997; 20:209-19. [PMID: 9218170 DOI: 10.1016/s0141-8130(97)01163-x] [Citation(s) in RCA: 12] [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: 02/04/2023]
Abstract
A cyclic disulfide peptide corresponding to the G-H loop sequence 134-155 [replacement Tyr136 and Arg153 with Cys] of the capsid protein VP1 of foot-and-mouth disease virus (FMDV) isolate C-S8c1 was examined by proton 2D-NMR spectroscopy in water and in 25% HFIP/water. In water, NMR data supported the presence of a non-canonical turn in the central, conserved cell adhesion RGD motif and suggested the presence of a nascent helix in the C-terminal part, stabilized and slightly extended upon addition of 25% HFIP, a secondary structure stabilizing cosolvent. The formation of the C-terminal helix was evidenced by combined analysis of NOE connectivities, H alpha chemical shifts, 3JNH-H alpha coupling constants and amide temperature coefficients. Surprisingly, these global structural features of the cyclic peptide in solution show similarities to previous X-ray structure analysis of (a) a shortened linear peptide complexed with a antivirus antibody and (b) the G-H loop represented on the chemical reduced viral surface of a different serotype. Thus, even in entirely different biological environments the cyclic peptide reflect similar structural features, reinforcing the concept that this viral loop behaves as an independent structural and functional unit.
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Affiliation(s)
- T Haack
- Department of Organic Chemistry, University of Barcelona, Spain
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Taboga O, Tami C, Carrillo E, Núñez JI, Rodríguez A, Saíz JC, Blanco E, Valero ML, Roig X, Camarero JA, Andreu D, Mateu MG, Giralt E, Domingo E, Sobrino F, Palma EL. A large-scale evaluation of peptide vaccines against foot-and-mouth disease: lack of solid protection in cattle and isolation of escape mutants. J Virol 1997; 71:2606-14. [PMID: 9060612 PMCID: PMC191381 DOI: 10.1128/jvi.71.4.2606-2614.1997] [Citation(s) in RCA: 186] [Impact Index Per Article: 6.9] [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: 02/03/2023] Open
Abstract
A large-scale vaccination experiment involving a total of 138 cattle was carried out to evaluate the potential of synthetic peptides as vaccines against foot-and-mouth disease. Four types of peptides representing sequences of foot-and-mouth disease virus (FMDV) C3 Argentina 85 were tested: A, which includes the G-H loop of capsid protein VP1 (site A); AT, in which a T-cell epitope has been added to site A; AC, composed of site A and the carboxy-terminal region of VP1 (site C); and ACT, in which the three previous capsid motifs are colinearly represented. Induction of neutralizing antibodies, lymphoproliferation in response to viral antigens, and protection against challenge with homologous infectious virus were examined. None of the tested peptides, at several doses and vaccination schedules, afforded protection above 40%. Protection showed limited correlation with serum neutralization activity and lymphoproliferation in response to whole virus. In 12 of 29 lesions from vaccinated cattle that were challenged with homologous virus, mutant FMDVs with amino acid substitutions at antigenic site A were identified. This finding suggests the rapid generation and selection of FMDV antigenic variants in vivo. In contrast with previous studies, this large-scale vaccination experiment with an important FMDV host reveals considerable difficulties for vaccines based on synthetic peptides to achieve the required levels of efficacy. Possible modifications of the vaccine formulations to increase protective activity are discussed.
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Affiliation(s)
- O Taboga
- Instituto de Biotecnología, Centro de Investigacion en Ciencias Veterinarias, INTA, Buenos Aires, Argentina
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