1
|
Queiroz KA, Vale EP, Martín-Pastor M, Sólon LGS, Sousa FFO. Metabolomic Profile, Plasmatic Levels of Losartan and EXP3174, Blood Pressure Control in Hypertensive Patients and Their Correlation with COVID-19. Pharmaceuticals (Basel) 2023; 16:1290. [PMID: 37765098 PMCID: PMC10535928 DOI: 10.3390/ph16091290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 07/21/2023] [Accepted: 07/27/2023] [Indexed: 09/29/2023] Open
Abstract
Systemic arterial hypertension (SAH) is one of the most prevalent chronic diseases worldwide and is related to serious health complications. It has been pointed out as a major risk factor for COVID-19. This study aimed to determine the impact of COVID-19 on the metabolomic profile, the correlation with the plasmatic levels of losartan and its active metabolite (EXP3174), biochemical markers, and blood pressure (BP) control in hypertensive patients. 1H NMR metabolomic profiles of hypertensive and normotensive patients with and without previous COVID-19 diagnosis were identified. Plasmatic levels of LOS and EXP3174 were correlated with BP, biochemical markers, and the metabolomic fingerprint of the groups. Biomarkers linked to important aspects of SAH and COVID-19 were identified, such as glucose, glutamine, arginine, creatinine, alanine, choline, erythritol, homogentisate, 0-tyrosine, and 2-hydroxybutyrate. Those metabolites are indicative of metabolic alterations, kidney damage, pulmonary dysfunction, and persistent inflammation, which can be found in both diseases. Some hypertensive patients did not reach the therapeutic levels of LOS and EXP3174, while the BP control was also limited among the normotensive patients with previous COVID-19 diagnoses. Metabolomics proved to be an important tool for assessing the effectiveness of losartan pharmacotherapy and the damage caused by SAH and COVID-19 in hypertensive patients.
Collapse
Affiliation(s)
- Kamila A. Queiroz
- Graduate Program on Pharmaceutical Sciences, Department of Biological & Health Sciences, Federal University of Amapa, Macapa 68903-419, Brazil; (K.A.Q.); (L.G.S.S.)
- Laboratory of Quality Control, Bromatology and Microbiology, Department of Biological & Health Sciences, Federal University of Amapa, Macapa 68903-419, Brazil;
| | - Everton P. Vale
- Laboratory of Quality Control, Bromatology and Microbiology, Department of Biological & Health Sciences, Federal University of Amapa, Macapa 68903-419, Brazil;
- Graduate Program on Pharmaceutical Innovation, Department of Biological & Health Sciences, Federal University of Amapa, Macapa 68903-419, Brazil
| | - Manuel Martín-Pastor
- Unidade de Resonancia Magnetica, Área de Infraestruturas de Investigación, Campus Vida, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain;
| | - Lílian G. S. Sólon
- Graduate Program on Pharmaceutical Sciences, Department of Biological & Health Sciences, Federal University of Amapa, Macapa 68903-419, Brazil; (K.A.Q.); (L.G.S.S.)
- Laboratory of Quality Control, Bromatology and Microbiology, Department of Biological & Health Sciences, Federal University of Amapa, Macapa 68903-419, Brazil;
| | - Francisco F. O. Sousa
- Graduate Program on Pharmaceutical Sciences, Department of Biological & Health Sciences, Federal University of Amapa, Macapa 68903-419, Brazil; (K.A.Q.); (L.G.S.S.)
- Laboratory of Quality Control, Bromatology and Microbiology, Department of Biological & Health Sciences, Federal University of Amapa, Macapa 68903-419, Brazil;
- Graduate Program on Pharmaceutical Innovation, Department of Biological & Health Sciences, Federal University of Amapa, Macapa 68903-419, Brazil
| |
Collapse
|
2
|
Pérez L, Sentís A, Hafidi Z, Pinazo A, García MT, Martín-Pastor M, de Sousa FFO. Zein Nanoparticles Containing Arginine-Based Surfactants: Physicochemical Characterization and Effect on the Biological Properties. Int J Mol Sci 2023; 24:ijms24032568. [PMID: 36768892 PMCID: PMC9917094 DOI: 10.3390/ijms24032568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 01/12/2023] [Accepted: 01/20/2023] [Indexed: 01/31/2023] Open
Abstract
Cationic surfactants carry antimicrobial activity, based on their interaction and disruption of cell membranes. Nonetheless, their intrinsic toxicity limits their applicability. To overcome this issue, a feasible strategy consists of using solid nanoparticles to improve their delivery. The zein nanoparticles were loaded with four cationic arginine-based surfactants: one single chain Nα-lauroyl-arginine (LAM) and three Gemini surfactants Nα Nω-Bis (Nα-lauroyl-arginine) α, ω-diamide) (C3(LA)2, C6(LA)2 and C9(LA)2). Blank and loaded zein nanoparticles were characterized in terms of size, polydispersity and zeta potential. Furthermore, the antimicrobial activity against bacteria and yeasts and the hemolytic activity were investigated and compared to the surfactants in a solution. Nanoparticles were found to be monodisperse, presenting a size of between 180-341 nm, a pdI of <0.2 and a positive zeta potential of between +13 and +53 mV, remaining stable over 365 days. The nanoencapsulation maintained the antimicrobial activity as unaltered, while the extensive hemolytic activity found for the surfactants in a solution was reduced drastically. Nuclear Magnetic Ressonance (NMR), molecular docking and monolayer findings indicated that zein entraps the surfactants, interfering in the surfactant-membrane interactions. Accordingly, the nanoepcasulation of arginine surfactants improved their selectivity, while the cationic charges were free to attack and destroy bacteria and fungi; the aliphatic chains were not available to disrupt the cellular membranes.
Collapse
Affiliation(s)
- Lourdes Pérez
- Department of Surfactants and Nanobiotechnology, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), 08034 Barcelona, Spain
| | - Adrià Sentís
- While was at Biocompatible Surfactant and Liquid Ionic Group, Institut de Química Avançada de Catalunya-CSIC, 08034 Barcelona, Spain
| | - Zakaria Hafidi
- Department of Surfactants and Nanobiotechnology, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), 08034 Barcelona, Spain
| | - Aurora Pinazo
- Department of Surfactants and Nanobiotechnology, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), 08034 Barcelona, Spain
- Correspondence:
| | - Maria Teresa García
- Department of Surfactants and Nanobiotechnology, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), 08034 Barcelona, Spain
| | - Manuel Martín-Pastor
- Unidad de Resonancia Magnética, Área de Infraestructuras de Investigación, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | | |
Collapse
|
3
|
Perez L, Hafidi Z, Pinazo A, García MT, Martín-Pastor M, de Sousa FFO. Zein Nanoparticles Containing Arginine-Phenylalanine-Based Surfactants: Stability, Antimicrobial and Hemolytic Activity. Nanomaterials (Basel) 2023; 13:200. [PMID: 36616110 PMCID: PMC9824401 DOI: 10.3390/nano13010200] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 12/26/2022] [Accepted: 12/27/2022] [Indexed: 06/17/2023]
Abstract
Although cationic surfactants have a remarkable antimicrobial activity, they present an intrinsic toxicity that discourages their usage. In this work novel zein nanoparticles loaded with arginine-phenylalanine-based surfactants are presented. The nanoparticles were loaded with two single polar head (LAM and PNHC12) and two with double amino acid polar head surfactants, arginine-phenylalanine (C12PAM, PANHC12). The formulations were characterized and their stability checked up to 365 days. Furthermore, the antimicrobial and hemolytic activities were investigated. Finally, NMR and molecular docking studies were carried out to elucidate the possible interaction mechanisms of surfactant-zein. The nanoparticles were obtained with satisfactory size, zeta potential and dispersibility. The surfactants containing arginine-phenylalanine residues were found to be more stable. The nanoencapsulation maintained the antimicrobial activities unaltered in comparison to the surfactants' solutions. These results are in agreement with the NMR and docking findings, suggesting that zein interacts with the surfactants by the aromatic rings of phenylalanine. As a result, the cationic charges and part of the aliphatic chains are freely available to attack the bacteria and fungi, while not available to disrupt the cellular membranes. This approach opens new possibilities for using cationic surfactants and benefits from their extraordinary antimicrobial responses for several applications.
Collapse
Affiliation(s)
- Lourdes Perez
- Department of Surfactants and Nanobiotechnology, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), 08034 Barcelona, Spain
| | - Zakaria Hafidi
- Department of Surfactants and Nanobiotechnology, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), 08034 Barcelona, Spain
| | - Aurora Pinazo
- Department of Surfactants and Nanobiotechnology, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), 08034 Barcelona, Spain
| | - Maria Teresa García
- Department of Surfactants and Nanobiotechnology, Institute for Advanced Chemistry of Catalonia (IQAC-CSIC), 08034 Barcelona, Spain
| | - Manuel Martín-Pastor
- Unidad de Resonancia Magnética, Área de Infraestructuras de Investigación, Universidad de Santiago de Compostela, Santiago de Compostela, 15782 A Coruña, Spain
| | | |
Collapse
|
4
|
Gomes JM, Silva SS, Fernandes EM, Lobo FC, Martín-Pastor M, Taboada P, Reis RL. Silk fibroin/cholinium gallate-based architectures as therapeutic tools. Acta Biomater 2022; 147:168-184. [PMID: 35580828 DOI: 10.1016/j.actbio.2022.05.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Revised: 05/10/2022] [Accepted: 05/10/2022] [Indexed: 12/13/2022]
Abstract
The combination of natural resources with biologically active biocompatible ionic liquids (Bio-IL) is presented as a combinatorial approach for developing tools to manage inflammatory diseases. Innovative biomedical solutions were constructed combining silk fibroin (SF) and Ch[Gallate], a Bio-IL with antioxidant and anti-inflammatory features, as freeze-dried 3D-based sponges. An evaluation of the effect of the Ch[Gallate] concentration (≤3% w/v) on the SF/Ch[Gallate] sponges was studied. Structural changes observed on the sponges revealed that the Ch[Gallate] presence positively affected the β-sheet formation while not influencing the silk native structure, which was suggested by the FTIR and solid-state NMR results, respectively. Also, it was possible to modulate their mechanical properties, antioxidant activity and stability/degradation in an aqueous environment, by changing the Ch[Gallate] concentration. The architectures showed high water uptake ability and a weight loss that follows the controlled Ch[Gallate] release rate studied for 7 days. Furthermore, the sponges supported human adipose stem cells growth and proliferation, up to 7 days. TNF-α, IL-6 (pro-inflammatory) and IL-10 (anti-inflammatory) release quantification from a human monocyte cell line revealed a decrease in the pro-inflammatory cytokines concentrations in samples containing Ch[Gallate]. These outcomes encourage the use of the developed architectures as tissue engineering solutions, potentially targeting inflammation processes. STATEMENT OF SIGNIFICANCE: Combining natural resources with active biocompatible ionic liquids (Bio-IL) is herein presented as a combinatorial approach for the development of tools to manage inflammatory diseases. We propose using silk fibroin (SF), a natural protein, with cholinium gallate, a Bio-IL, with antioxidant and anti-inflammatory properties, to construct 3D-porous sponges through a sustainable methodology. The morphological features, swelling, and stability of the architectures were controlled by Bio-IL content in the matrices. The sponges were able to support human adipose stem cells growth and proliferation, and their therapeutic effect was proved by the blockage of TNF-α from activated and differentiated THP-1 monocytes. We believe that these bio-friendly and bioactive SF/Bio-IL-based sponges are effective for targeting pathologies with associated inflammatory processes.
Collapse
|
5
|
Díaz-Tomé V, García-Otero X, Varela-Fernández R, Martín-Pastor M, Conde-Penedo A, Aguiar P, González-Barcia M, Fernández-Ferreiro A, Otero-Espinar FJ. In situ forming and mucoadhesive ophthalmic voriconazole/HPβCD hydrogels for the treatment of fungal keratitis. Int J Pharm 2021; 597:120318. [PMID: 33540021 DOI: 10.1016/j.ijpharm.2021.120318] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 01/22/2021] [Accepted: 01/23/2021] [Indexed: 11/18/2022]
Abstract
Fungal keratitis is a severe infectious corneal disease. At present, no voriconazole ophthalmic formulations are approved by the FDA or EMA. This lack of therapeutic options leads to the reformulation of intravenous voriconazole preparations (VFEND®) by the hospital pharmacy departments to prepare the appropriate ophthalmic formulations (pharmacy compounding). However, the limited residence time of these formulations leads to an intensive treatment posology that may increase the occurrence of side effects. In the present study, two different hydrogels were developed and characterized in order to improve the voriconazole's ophthalmic solubility, permanence, and security. Voriconazole-cyclodextrin (HPβCD or HPɣCD) inclusion complexes in aqueous solutions were characterized by NMR and molecular modeling. Complexes were formed by encapsulation of voriconazole into the cyclodextrin's internal cavity which considerably increases its water solubility. Ocular safety was proven by ocular irritation studies. Permeability studies suggest both hydrogels have good corneal permeability. Furthermore, in vivo ocular permanence study by PET/CT showed a longer permanence time on the ocular surface (t1/2 = 58.91 ± 13.4 min and 96.28 ± 49.11 min for VZHAH and VZISH 0.65 respectively) compared to the voriconazole control formulation (VFEND® t1/2 = 32.27 ± 15.56 min). Results suggest these formulations are a good alternative for the treatment of fungal keratitis.
Collapse
Affiliation(s)
- Victoria Díaz-Tomé
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology and Industrial Pharmacy Institute, Faculty of Pharmacy, University of Santiago de Compostela (USC), Santiago de Compostela. Spain; Clinical Pharmacology Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain
| | - Xurxo García-Otero
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology and Industrial Pharmacy Institute, Faculty of Pharmacy, University of Santiago de Compostela (USC), Santiago de Compostela. Spain; Molecular Imaging Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain
| | - Rubén Varela-Fernández
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology and Industrial Pharmacy Institute, Faculty of Pharmacy, University of Santiago de Compostela (USC), Santiago de Compostela. Spain; Clinical Neurosciences Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain
| | - Manuel Martín-Pastor
- Nuclear Magnetic Resonance Unit, Research Infrastructures Area, Universidade de Santiago de Compostela, Campus Vida, Santiago de Compostela, Spain
| | - Andrea Conde-Penedo
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology and Industrial Pharmacy Institute, Faculty of Pharmacy, University of Santiago de Compostela (USC), Santiago de Compostela. Spain
| | - Pablo Aguiar
- Molecular Imaging Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain
| | - Miguel González-Barcia
- Pharmacy Department. University Clinical Hospital Santiago de Compostela (SERGAS), Santiago de Compostela, Spain; Clinical Pharmacology Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain
| | - Anxo Fernández-Ferreiro
- Pharmacy Department. University Clinical Hospital Santiago de Compostela (SERGAS), Santiago de Compostela, Spain; Clinical Pharmacology Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain.
| | - Francisco J Otero-Espinar
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology and Industrial Pharmacy Institute, Faculty of Pharmacy, University of Santiago de Compostela (USC), Santiago de Compostela. Spain; Paraquasil Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela (IDIS), Santiago de Compostela, Spain.
| |
Collapse
|
6
|
García-Otero X, Díaz-Tomé V, Varela-Fernández R, Martín-Pastor M, González-Barcia M, Blanco-Méndez J, Mondelo-García C, Bermudez MA, Gonzalez F, Aguiar P, Fernández-Ferreiro A, Otero-Espinar FJ. Development and Characterization of a Tacrolimus/Hydroxypropyl-β-Cyclodextrin Eye Drop. Pharmaceutics 2021; 13:pharmaceutics13020149. [PMID: 33498753 PMCID: PMC7911614 DOI: 10.3390/pharmaceutics13020149] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2020] [Revised: 01/14/2021] [Accepted: 01/19/2021] [Indexed: 02/03/2023] Open
Abstract
Uveitis is a vision inflammatory disorder with a high prevalence in developing countries. Currently, marketed treatments remain limited and reformulation is usually performed to obtain a tacrolimus eye drop as a therapeutic alternative in corticosteroid-refractory eye disease. The aim of this work was to develop a mucoadhesive, non-toxic and stable topical ophthalmic formulation that can be safely prepared in hospital pharmacy departments. Four different ophthalmic formulations were prepared based on the tacrolimus/hydroxypropyl-β-cyclodextrin (HPβCD) inclusion complexes’ formation. Phase solubility diagrams, Nuclear Magnetic Resonance (NMR) and molecular modeling studies showed the formation of 1:1 and 1:2 tacrolimus/HPβCD inclusion complexes, being possible to obtain a 0.02% (w/v) tacrolimus concentration by using 40% (w/v) HPβCD aqueous solutions. Formulations also showed good ophthalmic properties in terms of pH, osmolality and safety. Stability studies proved these formulations to be stable for at least 3 months in refrigeration. Ex vivo bioadhesion and in vivo ocular permanence showed good mucoadhesive properties with higher ocular permanence compared to the reference pharmacy compounding used in clinical settings (t1/2 of 86.2 min for the eyedrop elaborated with 40% (w/v) HPβCD and Liquifilm® versus 46.3 min for the reference formulation). Thus, these novel eye drops present high potential as a safe alternative for uveitis treatment, as well as a versatile composition to include new drugs intended for topical ophthalmic administration.
Collapse
Affiliation(s)
- Xurxo García-Otero
- Pharmacology, Pharmacy and Pharmaceutical Technology Department, Faculty of Pharmacy, University of Santiago de Compostela (USC), 15705 Santiago de Compostela, Spain; (X.G.-O.); (V.D.-T.); (R.V.-F.); (J.B.-M.)
- Molecular Imaging Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela (IDIS), 15706 Santiago de Compostela, Spain
| | - Victoria Díaz-Tomé
- Pharmacology, Pharmacy and Pharmaceutical Technology Department, Faculty of Pharmacy, University of Santiago de Compostela (USC), 15705 Santiago de Compostela, Spain; (X.G.-O.); (V.D.-T.); (R.V.-F.); (J.B.-M.)
- Clinical Pharmacology Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela (IDIS), 15706 Santiago de Compostela, Spain; (M.G.-B.); (C.M.-G.)
| | - Rubén Varela-Fernández
- Pharmacology, Pharmacy and Pharmaceutical Technology Department, Faculty of Pharmacy, University of Santiago de Compostela (USC), 15705 Santiago de Compostela, Spain; (X.G.-O.); (V.D.-T.); (R.V.-F.); (J.B.-M.)
- Clinical Neurosciences Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela (IDIS), 15706 Santiago de Compostela, Spain
| | - Manuel Martín-Pastor
- Nuclear Magnetic Resonance Unit, Research Infrastructures Area, University of Santiago de Compostela (USC), 15782 Santiago de Compostela, Spain;
| | - Miguel González-Barcia
- Clinical Pharmacology Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela (IDIS), 15706 Santiago de Compostela, Spain; (M.G.-B.); (C.M.-G.)
| | - José Blanco-Méndez
- Pharmacology, Pharmacy and Pharmaceutical Technology Department, Faculty of Pharmacy, University of Santiago de Compostela (USC), 15705 Santiago de Compostela, Spain; (X.G.-O.); (V.D.-T.); (R.V.-F.); (J.B.-M.)
- Paraquasil Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela (IDIS), 15706 Santiago de Compostela, Spain
| | - Cristina Mondelo-García
- Clinical Pharmacology Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela (IDIS), 15706 Santiago de Compostela, Spain; (M.G.-B.); (C.M.-G.)
| | - Maria A. Bermudez
- Physiology Department–CIMUS, University of Santiago de Compostela (USC), 15782 Santiago de Compostela, Spain;
| | - Francisco Gonzalez
- Ophthalmology Department, Clinical University Hospital Santiago de Compostela (SERGAS), 15706 Santiago de Compostela, Spain;
- Department of Surgery and Medical-Surgical Specialties and CIMUS, University of Santiago de Compostela (USC), 15782 Santiago de Compostela, Spain
| | - Pablo Aguiar
- Molecular Imaging Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela (IDIS), 15706 Santiago de Compostela, Spain
- Correspondence: (P.A.); (A.F.-F.); (F.J.O.-E.); Tel.: +34-881814878 (F.J.O.-E.)
| | - Anxo Fernández-Ferreiro
- Clinical Pharmacology Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela (IDIS), 15706 Santiago de Compostela, Spain; (M.G.-B.); (C.M.-G.)
- Correspondence: (P.A.); (A.F.-F.); (F.J.O.-E.); Tel.: +34-881814878 (F.J.O.-E.)
| | - Francisco J. Otero-Espinar
- Pharmacology, Pharmacy and Pharmaceutical Technology Department, Faculty of Pharmacy, University of Santiago de Compostela (USC), 15705 Santiago de Compostela, Spain; (X.G.-O.); (V.D.-T.); (R.V.-F.); (J.B.-M.)
- Paraquasil Group, University Clinical Hospital, Health Research Institute of Santiago de Compostela (IDIS), 15706 Santiago de Compostela, Spain
- Correspondence: (P.A.); (A.F.-F.); (F.J.O.-E.); Tel.: +34-881814878 (F.J.O.-E.)
| |
Collapse
|
7
|
Fujisawa K, Okano M, Martín-Pastor M, López-Sánchez R, Elguero J, Alkorta I. Multinuclear magnetic resonance studies of five silver(I) trinuclear pyrazolate complexes. Struct Chem 2020. [DOI: 10.1007/s11224-020-01661-2] [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: 10/23/2022]
|
8
|
Bouzo BL, Calvelo M, Martín-Pastor M, García-Fandiño R, de la Fuente M. In Vitro- In Silico Modeling Approach to Rationally Designed Simple and Versatile Drug Delivery Systems. J Phys Chem B 2020; 124:5788-5800. [PMID: 32525313 DOI: 10.1021/acs.jpcb.0c02731] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Rational design and development of a nanosystem usually relies on empirical approaches as well as a fair degree of serendipity. Understanding how nanosystems behave at the molecular level is of great importance for potential biomedical applications. In this work, we describe a nanosystem composed of two natural compounds, vitamin E and sphingomyelin, prepared by spontaneous emulsification (vitamin E-sphingomyelin nanosystems (VSNs)). Extensive characterization revealed suitable physicochemical properties, very high biocompatibility in vitro and in vivo, and colloidal stability during storage and in biological media, all relevant properties for clinical translation. We have additionally pursued a computational approach to gain an improved understanding of the assembling, structure, dynamics, and drug-loading capacity of VSNs, using both small molecules and biomolecules (resveratrol, curcumin, gemcitabine, and two peptides). The spontaneous formation of compartmentalized VSNs starting from completely disassembled molecules, observed here for the first time, was accurately assessed from the computational molecular dynamics trajectories. We describe here a synergistic in silico/in vitro approach showing the predictive power of computational simulations for VSNs' structural characterization and description of internal interaction mechanisms responsible for the association of bioactive molecules, representing a paradigm shift in the rational design of nanotechnologies as drug delivery systems for advanced personalized medicine.
Collapse
Affiliation(s)
- Belén L Bouzo
- Nano-Oncology and Translational Therapeutics Unit, Health Research Institute of Santiago de Compostela (IDIS), SERGAS, 15706 Santiago de Compostela, Spain
| | - Martín Calvelo
- Singular Research Centre in Chemical Biology and Molecular Materials (CIQUS) and Organic Chemistry Department, University of Santiago de Compostela (USC), 15782 Santiago de Compostela, Spain
| | - Manuel Martín-Pastor
- Magnetic Resonance Unit, RIAIDT, CACTUS, University of Santiago de Compostela (USC), 15782 Santiago de Compostela, Spain
| | - Rebeca García-Fandiño
- Singular Research Centre in Chemical Biology and Molecular Materials (CIQUS) and Organic Chemistry Department, University of Santiago de Compostela (USC), 15782 Santiago de Compostela, Spain
| | - María de la Fuente
- Nano-Oncology and Translational Therapeutics Unit, Health Research Institute of Santiago de Compostela (IDIS), SERGAS, 15706 Santiago de Compostela, Spain.,Cancer Network Research (CIBERONC), 28029 Madrid, Spain
| |
Collapse
|
9
|
Alkorta I, Elguero J, Dias HVR, Parasar D, Martín-Pastor M. An experimental and computational NMR study of organometallic nine-membered rings: Trinuclear silver(I) complexes of pyrazolate ligands. Magn Reson Chem 2020; 58:319-328. [PMID: 31984555 DOI: 10.1002/mrc.5002] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 01/21/2020] [Accepted: 01/23/2020] [Indexed: 05/26/2023]
Abstract
This work reports the calculation of the nuclear magnetic resonance (NMR) chemical shifts of eight trinuclear Ag(I) complexes of pyrazolate ligands using the relativistic program ZORA. The data from the literature concern exclusively 1 H, 13 C, and 19 F nuclei. For this reason, one of the complexes that is derived from 3,5-bis-trifluoromethyl-1H-pyrazole has been studied anew, and the 15 N and 109 Ag chemical shifts determined for the first time in solution. Solid-state NMR data of this compound have been obtained for some nuclei (1 H, 13 C, and 19 F) but not for others (14 N, 15 N, and 109 Ag).
Collapse
Affiliation(s)
- Ibon Alkorta
- Instituto de Química Médica, CSIC, Madrid, Spain
| | - José Elguero
- Instituto de Química Médica, CSIC, Madrid, Spain
| | - H V Rasika Dias
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas
| | - Devaborniny Parasar
- Department of Chemistry and Biochemistry, The University of Texas at Arlington, Arlington, Texas
| | - Manuel Martín-Pastor
- Unidad de Resonancia Magnética Nuclear, RIAIDT, CACTUS, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| |
Collapse
|
10
|
Baigorri R, Erro J, Urrutia Ó, Martinez JM, Mandado M, Martín-Pastor M, García-Mina JM. Both chemical and crystalline phase configuration influence the molecular features of humic acids in humic–calcium–phosphates fertilizers. RSC Adv 2019; 9:25790-25796. [PMID: 35530108 PMCID: PMC9070043 DOI: 10.1039/c9ra04383g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Accepted: 08/10/2019] [Indexed: 11/24/2022] Open
Abstract
Phosphate–metal–humic complexes are very relevant in nature due to their crucial role in phosphate availability for plants and microorganisms. Synthetic phosphate–calcium–humic acid (HA) complexes have proven to be efficient sources of available phosphorus for crops. However, the current knowledge about their structure and molecular features is very poor. The structural implications of phosphate interaction with humic binding sites through calcium bridges, in both monocalcium phosphate and dicalcium phosphate is investigated by using molecular modeling, 31P-NMR, 1H-NMR and X-ray diffractometry. The conformational changes in the molecular configuration of the humic acid involved in the interaction resulting from the synthetic process is also studied by using HPSEC and synchronous fluorescence. The results obtained allow us to identify the phosphate type in the crystalline phase that is involved in the interaction of humic acid binding sites and the different forms of calcium phosphate. Synchronous fluorescence also shows that whereas the conformational configuration of the HA binding site is only partially affected in the monocalcium phosphate interaction, it changes in the case of dicalcium phosphate showing simpler molecular arrangements. These changes in the molecular conformation of the binding site in HA in solution may influence the biological activity of the humic acid. On the other hand, HPSEC studies show that the humic–calcium–phosphate interaction is accompanied by increases in the humic acid apparent size distribution. This effect is more intense in the case of monocalcium phosphate system probably due the influence of pH. Phosphate–metal–humic complexes are very relevant in nature due to their crucial role in phosphate availability for plants and microorganisms.![]()
Collapse
Affiliation(s)
- Roberto Baigorri
- Innovation & Development Department
- Timac Agro España S.A
- Roullier Group
- 31508 Lodosa
- Spain
| | - Javier Erro
- BACh Research Group
- Department of Environmental Biology
- University of Navarra
- Pamplona
- Spain
| | - Óscar Urrutia
- BACh Research Group
- Department of Environmental Biology
- University of Navarra
- Pamplona
- Spain
| | - José Manuel Martinez
- BACh Research Group
- Department of Environmental Biology
- University of Navarra
- Pamplona
- Spain
| | - Marcos Mandado
- Physical Chemistry Department
- Faculty of Chemistry
- University of Vigo
- Campus Universitario
- Vigo
| | - Manuel Martín-Pastor
- Departamento de NMR C.A.C.T.U.S
- University of Santiago de Compostela
- Santiago de Compostela 15706
- Spain
| | - José M. García-Mina
- BACh Research Group
- Department of Environmental Biology
- University of Navarra
- Pamplona
- Spain
| |
Collapse
|
11
|
Lado-Abeal J, Martinez-Sánchez N, Cocho JA, Martín-Pastor M, Castro-Piedras I, Couce-Pico ML, Saha AK, López M. Lipopolysaccharide (LPS)-induced septic shock causes profound changes in myocardial energy metabolites in pigs. Metabolomics 2018; 14:131. [PMID: 30830414 DOI: 10.1007/s11306-018-1433-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Accepted: 09/21/2018] [Indexed: 01/03/2023]
Abstract
INTRODUCTION Energy deficiency is a cause for myocardial dysfunction during septic shock. In rodents, septic shock decreases the oxidation of long-chain fatty acids and glucose in the myocardium causing energy deficiency. However, the effect of septic shock on myocardial energy metabolites in large animals and human is unknown. OBJECTIVES Investigate the effects of septic shock on myocardial energy metabolites in domestic pigs. METHODS Seventeen female pigs divided into control and lipopolysaccharide (LPS)-induced septic shock groups. Myocardial metabolites were analyzed ex vivo by 1H nuclear magnetic resonance spectroscopy and liquid chromatography-tandem mass spectrometry. Gene and protein expression analysis were analyzed by real-time PCR and western blot. RESULTS Septic shock was associated with an increase in myocardial levels of short- and medium-chain acylcarnitines, lactate, alanine, and pyruvate dehydrogenase kinase 4 gene expression. COX-2 and prostaglandin E4 receptor gene expression also increased in the septic myocardium, although the only elevated eicosanoid in the septic animals was thromboxane B2. Myocardial levels of niacin, taurine, glutamate, glutamine, and glutathione were higher, and hypoxanthine levels lower in septic pigs than controls. CONCLUSIONS In pigs, septic shock induced by LPS caused myocardial changes directed to decrease the oxidation of medium- and short-chain fatty acid without an effect on long-chain fatty acid oxidation. The increase in myocardial levels of lactate, alanine, and pyruvate dehydrogenase kinase 4 gene expression suggest that septic shock decreases pyruvate dehydrogenase complex activity and glucose oxidation. Homeostasis of niacin, taurine, glutamate, glutamine, glutathione, hypoxanthine and thromboxane B2 is also affected in the septic myocardium.
Collapse
Affiliation(s)
- Joaquin Lado-Abeal
- Division of Endocrinology, Department of Internal Medicine, Texas Tech University Health Sciences Center-School of Medicine, Lubbock, TX, USA.
- Unidade de Enfermedades Tiroideas e Metabolicas (UETeM), Department of Medicine, University of Santiago de Compostela, Santiago de Compostela, Spain.
- Division of Endocrinology, Diabetes and Metabolism, Department of Internal Medicine Truman Medical Centers, University of Missouri-Kansas City School of Medicine, 2301 Holmes Street, Kansas City, MO, 64108, USA.
| | - Noelia Martinez-Sánchez
- NeurObesity Group, Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela, 15782, Spain
- CIBER Fisiopatologia de la Obesidad y Nutricion (CIBERobn), Santiago de Compostela, 15706, Spain
| | - Jose Angel Cocho
- Unidad de Diagnóstico y Tratamiento de las Enfermedades Metabólicas, Complexo Hospitalario Universitario de Santiago de Compostela, Santiago de Compostela, Spain
| | - Manuel Martín-Pastor
- Unidade de Resonancia Magnética (RIAIDT), Edif, CACTUS, University of Santiago de Compostela, Santiago de Compostela, 15782, Spain
| | - Isabel Castro-Piedras
- Division of Endocrinology, Department of Internal Medicine, Texas Tech University Health Sciences Center-School of Medicine, Lubbock, TX, USA
| | - M Luz Couce-Pico
- Unidad de Diagnóstico y Tratamiento de las Enfermedades Metabólicas, Complexo Hospitalario Universitario de Santiago de Compostela, Santiago de Compostela, Spain
| | - Asish K Saha
- Division of Endocrinology, Diabetes and Nutrition, Boston University Medical Center, Boston, MA, USA
| | - Miguel López
- NeurObesity Group, Department of Physiology, CIMUS, University of Santiago de Compostela-Instituto de Investigación Sanitaria, Santiago de Compostela, 15782, Spain
| |
Collapse
|
12
|
Alvarez-Trabado J, López-García A, Martín-Pastor M, Diebold Y, Sanchez A. Sorbitan ester nanoparticles (SENS) as a novel topical ocular drug delivery system: Design, optimization, and in vitro/ex vivo evaluation. Int J Pharm 2018; 546:20-30. [PMID: 29753904 DOI: 10.1016/j.ijpharm.2018.05.015] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 05/04/2018] [Accepted: 05/05/2018] [Indexed: 12/25/2022]
Abstract
We explored the potential of two types of sorbitan ester nanoparticles (SENS) as novel tools for topical ocular drug delivery. The optimized SENS formulation (SENS-OPT) consisted of nanoparticles (NPs) of 170.5 nm, zeta potential +33.9 mV, and cyclosporine loading of 19.66%. After hyaluronic acid (HA) coating, the resulting SENS-OPT-HA NPs had a particle size of 177.6 nm and zeta potential of -20.6 mV. The NPs were stable during 3 months of storage at different temperatures and did not aggregate in the presence of protein-enriched simulated lacrimal fluid. There was no toxicity to cultured human corneal epithelial (HCE) cells when exposed to NPs up to 0.4% (w/v). Both NPs were effectively internalized by HCE cells through active mechanisms. Endocytosis of SENS-OPT NPs was caveolin-dependent whereas SENS-OPT-HA NP endocytosis was mediated by HA receptors. HA-receptor-mediated endocytosis may be responsible for the higher cellular uptake of SENS-OPT-HA NPs. After cyclosporine incorporation into the NPs, corneal penetration of this immunosuppressive drug by loaded SENS-OPT NPs was 1.3-fold higher than the commercial reference formulation Sandimmun®. For cyclosporine-loaded SENS-OPT-HA NPs, the penetration was 2.1-fold higher than for Sandimmun®. In ex vivo stimulated lymphocytes, both formulations demonstrated the same reduction in IL-2 levels as Sandimmun®.
Collapse
Affiliation(s)
- Jesus Alvarez-Trabado
- Institute of Applied Ophthalmo-Biology (IOBA), University of Valladolid, 47011 Valladolid, Spain; Department of Pharmacology, Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela (USC), Campus Vida, 15782 Santiago de Compostela, Spain
| | - Antonio López-García
- Institute of Applied Ophthalmo-Biology (IOBA), University of Valladolid, 47011 Valladolid, Spain
| | - Manuel Martín-Pastor
- Nuclear Magnetic Resonance Unit, RIADT, Universidade de Santiago de Compostela, Campus Vida, 15706 Santiago de Compostela, Spain
| | - Yolanda Diebold
- Institute of Applied Ophthalmo-Biology (IOBA), University of Valladolid, 47011 Valladolid, Spain; Biomedical Research Networking Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Valladolid, Spain
| | - Alejandro Sanchez
- Department of Pharmacology, Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela (USC), Campus Vida, 15782 Santiago de Compostela, Spain; Genetics and Biology of the Development of Kidney Diseases Unit, Sanitary Research Institute (IDIS) of the University Hospital Complex of Santiago de Compostela (CHUS), Travesía da Choupana, s/n, 15706 Santiago de Compostela, Spain.
| |
Collapse
|
13
|
Urrutia O, Erro J, Zabini A, Hoshiba K, Blandin AF, Baigorri R, Martín-Pastor M, Alis Y, Yvin JC, García-Mina JM. New Amphiphilic Composite for Preparing Efficient Coated Potassium-Fertilizers for Top-Dressing Fertilization of Annual Crops. J Agric Food Chem 2018; 66:4787-4799. [PMID: 29677445 DOI: 10.1021/acs.jafc.7b04596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This study describes the efficiency of a new coating material for preparing granulated potassium-fertilizers with a potassium release to the soil solution sensitive to rainfall intensity. The composite is prepared by reaction of an alkyd-resin with cement in the absence of water. The complementary use of diverse analytical techniques showed that the presence of the cement fraction induced alkyd resin reticulation and gradual cement-resin hardening. Scanning electron microscopy revealed the formation of micro and nanopores within cement-clusters, whose water permeability is affected by the resin reticulation and amphiphilic character. Potassium release was evaluated in water, soil-columns, and in soil-plant trials in pots and open-field. Agronomic results were consistent with potassium release rates obtained in water solution and soil columns. The composite-coated potassium fertilizer was more efficient than the noncoated one in providing plant available potassium, with this effect being dependent on water presence in soil.
Collapse
Affiliation(s)
- Oscar Urrutia
- BACh Research Group, Department of Environmental Biology , University of Navarra , Irunlarrea No. 1 , 31008 , Pamplona , Spain
| | - Javier Erro
- BACh Research Group, Department of Environmental Biology , University of Navarra , Irunlarrea No. 1 , 31008 , Pamplona , Spain
| | - Andre Zabini
- "Agronomico" , Laboratorio de Suelos y Consultoría, Edificio Azar , 2nd Piso, Av. Parana , 1617 , Hernandarias , Paraguay
| | - Kent Hoshiba
- Centro de R&D, Roullier Latino , Roullier Group , Minga Guaçu Km 5 , Alto Paraná 7420 , Paraguay
| | - Anne F Blandin
- Centre d'Etudes de Recherche Apliqueés "CERA" , Roullier Group , 55 Boulevard Jules Verger 35800 , Dinard , France
| | - Roberto Baigorri
- Departamento de Desarrollo e Inovación Timac Agro España S.A. , Roullier Group , Barrio Feculas s/n , 31508 Lodosa , Spain
| | - Manuel Martín-Pastor
- Departamento de NMR C.A.C.T.U.S. , University of Santiago de Compostela , Santiago de Compostela 15706 , Spain
| | - Yves Alis
- Centre d'Etudes de Recherche Apliqueés "CERA" , Roullier Group , 55 Boulevard Jules Verger 35800 , Dinard , France
| | - Jean C Yvin
- Centre Mondial d'Innovation CMI , Roullier Group , Atalante Saint-Malo, 18 Avenue Franklin Roosevelt , 35400 , Saint Malo , France
| | - José M García-Mina
- BACh Research Group, Department of Environmental Biology , University of Navarra , Irunlarrea No. 1 , 31008 , Pamplona , Spain
| |
Collapse
|
14
|
Pensado A, Martín-Pastor M, Zorzi GK, Carvalho ES, Sanchez A. Structural analysis of nanosystems: Solid Sorbitan esters Nanoparticles (SSN) as a case study. Eur J Pharm Biopharm 2016; 104:189-99. [DOI: 10.1016/j.ejpb.2016.05.002] [Citation(s) in RCA: 4] [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] [Received: 01/11/2016] [Revised: 04/21/2016] [Accepted: 05/04/2016] [Indexed: 12/22/2022]
|
15
|
Otero XL, Tejada O, Martín-Pastor M, De La Peña S, Ferreira TO, Pérez-Alberti A. Phosphorus in seagull colonies and the effect on the habitats. The case of yellow-legged gulls (Larus michahellis) in the Atlantic Islands National Park (Galicia-NW Spain). Sci Total Environ 2015; 532:383-397. [PMID: 26081740 DOI: 10.1016/j.scitotenv.2015.06.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2015] [Revised: 06/02/2015] [Accepted: 06/03/2015] [Indexed: 06/04/2023]
Abstract
During the period 1980-2000, the yellow-legged gull population underwent exponential growth due to an increase in the availability of anthropogenic food resources. The aim of this study was to highlight the effect of the gull colonies on the P soil cycle and the associated effects on coastal ecosystems. Samples of soil, water and faecal material were collected in a colony of yellow-legged gulls (Cíes Islands) and in a control area. Four sampling plots were installed in the study areas, and samples were collected in summer and winter in 1997 and 2011. Sample analysis included soil characterization and determination of the total P content (TP), bioavailable-P and fractionated-P forms in the soils and faecal material. The (31)P NMR technique was also used to determine organic P forms. Clear differences between the gull colony soils and the control soil were observed. The TP was 3 times higher in the gull colony soil, and the bioavailable P was 30 times higher than in the control soil. The P forms present at highest concentrations in the faecal material (P-apatite, P-residual and P-humic acid) were also present at high concentrations in the colony soil. The absence of any seasonal or annual differences in P concentration indicates that the P has remained stable in the soil over time, regardless of the changes in the gull population density. The degree of P saturation indicated that soils are saturated with P due to the low concentration of Fe/Al-hydroxides, which is consistent with a high P concentration in the run-off from the colonies. The P output from the colony soils to coastal waters may cause eutrophication of a nearby lagoon and the disappearance of a Zostera marina seagrass meadow. Similarly, the enrichment of P concentration in dune system of Muxieiro may induce irreversible changes in the plant communities.
Collapse
Affiliation(s)
- X L Otero
- Departamento de Edafoloxía e Química Agrícola, Facultade de Bioloxía, Universidade de Santiago de Compostela, Spain; Departamento de Tecnología de Ciencia de los Alimentos y Biotecnología. Universidad Politécnica Nacional, Quito, Ecuador.
| | - O Tejada
- Departamento de Edafoloxía e Química Agrícola, Facultade de Bioloxía, Universidade de Santiago de Compostela, Spain
| | - M Martín-Pastor
- Rede de Infraestruturas de Apoio á Investigación e ao Desenvolvemento Tecnolóxico (RIAIDT), Edificio Cactus, Universidad de Santiago de Compostela, Spain
| | - S De La Peña
- Departamento de Edafoloxía e Química Agrícola, Facultade de Bioloxía, Universidade de Santiago de Compostela, Spain
| | - T O Ferreira
- Departamento de Ciência do Solo, Universidade de São Paulo, 13418-900 Piracicaba, SP, Brazil
| | - A Pérez-Alberti
- Departamento de Xeografía, Facultade de Xeografía e Historia, Universidade de Santiago de Compostela, Spain
| |
Collapse
|
16
|
Aliaga ME, García-Río L, Pessêgo M, Montecinos R, Fuentealba D, Uribe I, Martín-Pastor M, García-Beltrán O. Host–guest interaction of coumarin-derivative dyes and cucurbit[7]uril: leading to the formation of supramolecular ternary complexes with mercuric ions. NEW J CHEM 2015. [DOI: 10.1039/c5nj00162e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The interaction between the studied coumarin derivatives-cucurbit[7]uril complexes and mercuric ions displays a positive cooperative effect relative to the dyes alone.
Collapse
Affiliation(s)
| | - Luis García-Río
- Departamento de Química Física
- Centro de Investigación en Química Biológica y Materiales Moleculares (CIQUS)
- Universidad de Santiago
- 15782 Santiago
- Spain
| | - Márcia Pessêgo
- Departamento de Química Física
- Centro de Investigación en Química Biológica y Materiales Moleculares (CIQUS)
- Universidad de Santiago
- 15782 Santiago
- Spain
| | - Rodrigo Montecinos
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Casilla 306
- Chile
| | - Denis Fuentealba
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Casilla 306
- Chile
| | - Iván Uribe
- Facultad de Química
- Pontificia Universidad Católica de Chile
- Casilla 306
- Chile
| | - Manuel Martín-Pastor
- Unidade de Resonancia Magnética
- RIAIDT
- Edif. CACTUS
- Universidad de Santiago
- 15782 Santiago
| | - Olimpo García-Beltrán
- Facultad de Ciencias Naturales y Matemáticas
- Universidad de Ibagué
- Carrera 22 Calle 67
- Colombia
| |
Collapse
|
17
|
Gómez B, Francisco V, Fernández-Nieto F, Garcia-Rio L, Martín-Pastor M, Paleo MR, Sardina FJ. Host-Guest Chemistry of a Water-Soluble Pillar[5]arene: Evidence for an Ionic-Exchange Recognition Process and Different Complexation Modes. Chemistry 2014; 20:12123-32. [DOI: 10.1002/chem.201403194] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Indexed: 11/07/2022]
|
18
|
López-Cebral R, Romero-Caamaño V, Seijo B, Alvarez-Lorenzo C, Martín-Pastor M, Concheiro Á, Landin M, Sanchez A. Spermidine Cross-Linked Hydrogels as a Controlled Release Biomimetic Approach for Cloxacillin. Mol Pharm 2014; 11:2358-71. [DOI: 10.1021/mp500067z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Rita López-Cebral
- Department
of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela, Campus Vida, 15782 Santiago de Compostela, Spain
| | - Vanessa Romero-Caamaño
- Department
of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela, Campus Vida, 15782 Santiago de Compostela, Spain
| | - Begoña Seijo
- Department
of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela, Campus Vida, 15782 Santiago de Compostela, Spain
- Molecular
Image Group, University of Santiago de Compostela Clinical Hospital, Travesía
da Choupana, 15706 Santiago de Compostela, Spain
| | - Carmen Alvarez-Lorenzo
- Department
of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela, Campus Vida, 15782 Santiago de Compostela, Spain
| | - Manuel Martín-Pastor
- Nuclear
Magnetic Resonance Unit, University of Santiago de Compostela, Campus
Vida, 15706 Santiago
de Compostela, Spain
| | - Ángel Concheiro
- Department
of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela, Campus Vida, 15782 Santiago de Compostela, Spain
| | - Mariana Landin
- Department
of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela, Campus Vida, 15782 Santiago de Compostela, Spain
| | - Alejandro Sanchez
- Department
of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela, Campus Vida, 15782 Santiago de Compostela, Spain
- Molecular
Image Group, University of Santiago de Compostela Clinical Hospital, Travesía
da Choupana, 15706 Santiago de Compostela, Spain
| |
Collapse
|
19
|
López-Cebral R, Martín-Pastor M, Seijo B, Sanchez A. Progress in the characterization of bio-functionalized nanoparticles using NMR methods and their applications as MRI contrast agents. Prog Nucl Magn Reson Spectrosc 2014; 79:1-13. [PMID: 24815362 DOI: 10.1016/j.pnmrs.2014.01.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Revised: 01/13/2014] [Accepted: 01/15/2014] [Indexed: 05/22/2023]
Abstract
Significant progress has been made over the last three decades in the field of NMR, a technique which has proven to have a variety of applications in many scientific disciplines, including nanotechnology. Herein we describe how NMR enables the characterization of nanosystems at different stages of their formation and modification (raw materials, bare or functionalized nanosystems), even making it possible to study in vivo nanoparticle interactions, thereby importantly contributing to nanoparticle design and subsequent optimization. Furthermore, the unique characteristics of nanosystems can open up new prospects for site-targeted, more specific contrast agents, contributing to the development of certain nuclear magnetic resonance applications such as MRI.
Collapse
Affiliation(s)
- Rita López-Cebral
- Department of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela (USC), Campus Sur, 15782 Santiago de Compostela, Spain
| | - Manuel Martín-Pastor
- Nuclear Magnetic Resonance Unit, RIADT, University of Santiago de Compostela (USC), Campus Vida, 15706 Santiago de Compostela, Spain
| | - Begoña Seijo
- Department of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela (USC), Campus Sur, 15782 Santiago de Compostela, Spain; Molecular ImageGroup, IDIS, Santiago de Compostela University Hospital Complex (CHUS), A Choupana, 15706 Santiago de Compostela, Spain
| | - Alejandro Sanchez
- Department of Pharmacy and Pharmaceutical Technology, Faculty of Pharmacy, University of Santiago de Compostela (USC), Campus Sur, 15782 Santiago de Compostela, Spain; Molecular ImageGroup, IDIS, Santiago de Compostela University Hospital Complex (CHUS), A Choupana, 15706 Santiago de Compostela, Spain.
| |
Collapse
|
20
|
Sousa FFO, Luzardo-Álvarez A, Blanco-Méndez J, Otero-Espinar FJ, Martín-Pastor M, Sández Macho I. Use of 1H NMR STD, waterLOGSY, and Langmuir monolayer techniques for characterization of drug-zein protein complexes. Eur J Pharm Biopharm 2013; 85:790-8. [PMID: 23891773 DOI: 10.1016/j.ejpb.2013.07.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2013] [Revised: 07/10/2013] [Accepted: 07/14/2013] [Indexed: 11/30/2022]
Abstract
Zein is a protein based natural biopolymer containing a large amount of nonpolar amino acids, which has shown the ability to form aggregates and entrap solutes, such as drugs and amino acids to form stable protein-drug complexes. In this work, π-A isotherm, NMR, and Dynamic light scattering were used to detect the formation of protein aggregates and the affinity between zein and two different drugs: tetracycline and indomethacin. An effective interaction of zein and the two drugs was evidenced by means of liquid NMR reinforced by means of changes in the surface pressure by π-A isotherm. The effective interactions zein/drugs under air/water interface were evidenced as a change in the surface pressure of the π-A isotherm of zein in the presence of drug solutions. The presence of tetracycline in the subphase decreased the area occupied by the monolayer at the expanded region until pressures of 12 mN/m were the areas became similar, but indomethacin produces an increment of the area in both expanded and collapsed region. The feasible methodology employed, focused in the functionality of the protein-drug interaction, can be very promising in the drug delivery field.
Collapse
Affiliation(s)
- F F O Sousa
- Department of Pharmacy and Pharmaceutical Technology, School of Pharmacy, University of Santiago de Compostela, Santiago de Compostela, Spain; Department of Biological and Health Sciences, School of Pharmacy, University Federal of Amapá, Macapá, Brazil.
| | | | | | | | | | | |
Collapse
|
21
|
Canales A, Jiménez-Barbero J, Martín-Pastor M. Review: Use of residual dipolar couplings to determine the structure of carbohydrates. Magn Reson Chem 2012; 50 Suppl 1:S80-S85. [PMID: 23280664 DOI: 10.1002/mrc.3888] [Citation(s) in RCA: 18] [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] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Revised: 09/08/2012] [Accepted: 09/20/2012] [Indexed: 05/28/2023]
Abstract
Solution nuclear magnetic resonance spectroscopy is especially useful in the carbohydrate field. The measurement of residual dipolar couplings provides long-range structural information, a valuable complement for the structural study of carbohydrates either in its free form or in the bound state to proteins. They permit to deduce the geometry and the flexibility of the glycosidic linkages, which have a major influence on the conformation of carbohydrates and their overall shape. This article reviews the current application of the residual dipolar couplings methodology to carbohydrates.
Collapse
Affiliation(s)
- A Canales
- Department Organic Chemistry, Universidad Complutense de Madrid, Madrid, Spain
| | | | | |
Collapse
|
22
|
Alén BO, Nieto L, Gurriarán-Rodríguez U, Mosteiro CS, Álvarez-Pérez JC, Otero-Alén M, Camiña JP, Gallego R, García-Caballero T, Martín-Pastor M, Casanueva FF, Jiménez-Barbero J, Pazos Y. The NMR structure of human obestatin in membrane-like environments: insights into the structure-bioactivity relationship of obestatin. PLoS One 2012; 7:e45434. [PMID: 23056203 PMCID: PMC3464274 DOI: 10.1371/journal.pone.0045434] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2012] [Accepted: 08/17/2012] [Indexed: 11/23/2022] Open
Abstract
The quest for therapeutic applications of obestatin involves, as a first step, the determination of its 3D solution structure and the relationship between this structure and the biological activity of obestatin. On this basis, we have employed a combination of circular dichroism (CD), nuclear magnetic resonance (NMR) spectroscopy, and modeling techniques to determine the solution structure of human obestatin (1). Other analogues, including human non-amidated obestatin (2) and the fragment peptides (6–23)-obestatin (3), (11–23)-obestatin (4), and (16–23)-obestatin (5) have also been scrutinized. These studies have been performed in a micellar environment to mimic the cell membrane (sodium dodecyl sulfate, SDS). Furthermore, structural-activity relationship studies have been performed by assessing the in vitro proliferative capabilities of these peptides in the human retinal pigmented epithelial cell line ARPE-19 (ERK1/2 and Akt phosphorylation, Ki67 expression, and cellular proliferation). Our findings emphasize the importance of both the primary structure (composition and size) and particular segments of the obestatin molecule that posses significant α-helical characteristics. Additionally, details of a species-specific role for obestatin have also been hypothesized by comparing human and mouse obestatins (1 and 6, respectively) at both the structural and bioactivity levels.
Collapse
Affiliation(s)
- Begoña O. Alén
- Área de Endocrinología Molecular y Celular, Instituto de Investigación Sanitaria (IDIS), Complejo Hospitalario Universitario de Santiago de Compostela (CHUS), SERGAS, Santiago de Compostela, Spain
- CIBER Fisiopatología de la Obesidad y Nutrición (CB06/03), Instituto de Salud Carlos III, Santiago de Compostela, Spain
- Universidad de Santiago de Compostela, Santiago de Compostela, Spain
| | - Lidia Nieto
- Centro de Investigaciones Biológicas, CIB-CSIC, Madrid, Spain
| | - Uxía Gurriarán-Rodríguez
- Área de Endocrinología Molecular y Celular, Instituto de Investigación Sanitaria (IDIS), Complejo Hospitalario Universitario de Santiago de Compostela (CHUS), SERGAS, Santiago de Compostela, Spain
- CIBER Fisiopatología de la Obesidad y Nutrición (CB06/03), Instituto de Salud Carlos III, Santiago de Compostela, Spain
- Universidad de Santiago de Compostela, Santiago de Compostela, Spain
| | - Carlos S. Mosteiro
- Área de Endocrinología Molecular y Celular, Instituto de Investigación Sanitaria (IDIS), Complejo Hospitalario Universitario de Santiago de Compostela (CHUS), SERGAS, Santiago de Compostela, Spain
- CIBER Fisiopatología de la Obesidad y Nutrición (CB06/03), Instituto de Salud Carlos III, Santiago de Compostela, Spain
| | - Juan C. Álvarez-Pérez
- Área de Endocrinología Molecular y Celular, Instituto de Investigación Sanitaria (IDIS), Complejo Hospitalario Universitario de Santiago de Compostela (CHUS), SERGAS, Santiago de Compostela, Spain
- CIBER Fisiopatología de la Obesidad y Nutrición (CB06/03), Instituto de Salud Carlos III, Santiago de Compostela, Spain
- Universidad de Santiago de Compostela, Santiago de Compostela, Spain
| | - María Otero-Alén
- Instituto de Investigación Sanitaria (IDIS), Complejo Hospitalario Universitario de Santiago de Compostela (CHUS), Santiago de Compostela, Spain
| | - Jesús P. Camiña
- Área de Endocrinología Molecular y Celular, Instituto de Investigación Sanitaria (IDIS), Complejo Hospitalario Universitario de Santiago de Compostela (CHUS), SERGAS, Santiago de Compostela, Spain
- CIBER Fisiopatología de la Obesidad y Nutrición (CB06/03), Instituto de Salud Carlos III, Santiago de Compostela, Spain
| | - Rosalía Gallego
- Universidad de Santiago de Compostela, Santiago de Compostela, Spain
- Instituto de Investigación Sanitaria (IDIS), Complejo Hospitalario Universitario de Santiago de Compostela (CHUS), Santiago de Compostela, Spain
| | - Tomás García-Caballero
- Universidad de Santiago de Compostela, Santiago de Compostela, Spain
- Instituto de Investigación Sanitaria (IDIS), Complejo Hospitalario Universitario de Santiago de Compostela (CHUS), Santiago de Compostela, Spain
| | - Manuel Martín-Pastor
- Instituto de Investigación Sanitaria (IDIS), Complejo Hospitalario Universitario de Santiago de Compostela (CHUS), Santiago de Compostela, Spain
- Unidad de Resonancia Magnética, RIAIDT, Universidad de Santiago de Compostela, Campus Sur, Santiago de Compostela, Spain
| | - Felipe F. Casanueva
- Área de Endocrinología Molecular y Celular, Instituto de Investigación Sanitaria (IDIS), Complejo Hospitalario Universitario de Santiago de Compostela (CHUS), SERGAS, Santiago de Compostela, Spain
- CIBER Fisiopatología de la Obesidad y Nutrición (CB06/03), Instituto de Salud Carlos III, Santiago de Compostela, Spain
- Universidad de Santiago de Compostela, Santiago de Compostela, Spain
| | | | - Yolanda Pazos
- Área de Endocrinología Molecular y Celular, Instituto de Investigación Sanitaria (IDIS), Complejo Hospitalario Universitario de Santiago de Compostela (CHUS), SERGAS, Santiago de Compostela, Spain
- CIBER Fisiopatología de la Obesidad y Nutrición (CB06/03), Instituto de Salud Carlos III, Santiago de Compostela, Spain
- * E-mail:
| |
Collapse
|
23
|
Basilio N, Martín-Pastor M, García-Río L. Insights into the structure of the supramolecular amphiphile formed by a sulfonated calix[6]arene and alkyltrimethylammonium surfactants. Langmuir 2012; 28:6561-6568. [PMID: 22448819 DOI: 10.1021/la3006794] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this work, we have studied the interactions between the water-soluble p-sulfonatocalix[6]arene and cationic surfactants octyltrimethylammonium bromide below the cmc and dodecyltrimethylammonium bromide above the cmc, by saturation transfer difference (STD) NMR spectroscopy. From the STD build-up curves, we have obtained the T1 independent cross relaxation rates, and the results show that the interactions established between the cationic headgroup of the surfactant and the OMe group of the macrocycle play an important role in the stabilization of the complex, both below and above the cmc.
Collapse
Affiliation(s)
- Nuno Basilio
- Departamento de Química Física y Centro Singular de Investigación en Química Biológica y Materiales Moleculares, Universidad de Santiago , 15782 Santiago, Spain
| | | | | |
Collapse
|
24
|
Basílio N, Garcia-Rio L, Martín-Pastor M. Calixarene-based surfactants: evidence of structural reorganization upon micellization. Langmuir 2012; 28:2404-2414. [PMID: 22206305 DOI: 10.1021/la204004h] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The self-aggregation of five amphiphilic p-sulfonatocalix[n]arenes bearing alkyl chains at the lower rim was investigated by NMR spectroscopy and electrical conductivity. The critical micelle concentration was determined, and the tendency of this special class of surfactants to self-aggregate in aqueous solution was analyzed as a function of the alkyl chain length and the number of aromatic units in the macrocyclic ring. The structure of the surfactants in the monomeric and micellized states was elucidated by means of (1)H NMR and, in the case of the calix[6]arene derivative, with 2D NMR experiments. While all amphiphilic calix[4]arenes studied here are blocked in the cone conformation, in the monomeric state the calix[6]arene adopts a pseudo-1,2,3-alternate conformation and the calix[8]arene is conformationally mobile. These calixarenes undergo an aggregation-induced conformational change, adopting the cone conformation in the micelles. The structure and size of the aggregates were studied by diffusion ordered spectroscopy (DOSY) experiments, and the results indicate that these surfactants self-assemble into ellipsoidal micelles.
Collapse
Affiliation(s)
- Nuno Basílio
- Departamento de Química Física y Centro Singular de Investigación en Química Biológica y Materiales Moleculares (CIQUS), Universidad de Santiago, 15782 Santiago, Spain
| | | | | |
Collapse
|
25
|
Pinal-Fernández I, Martín-Pastor M, Ferro-Gallego P, Domínguez-Gerpe L. Ex vivo proton NMR analysis and characterization of thymus lipid metabolites and their variation with age in C57BL/6 mice. Curr Aging Sci 2011; 4:57-69. [PMID: 21204782 DOI: 10.2174/1874609811104010057] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2010] [Accepted: 07/06/2010] [Indexed: 05/30/2023]
Abstract
Application (1)H NMR spectroscopy techniques to the ex vivo study of thymus of 0.5-24 month-old C57BL/6 mice allowed the identification, the quantification and the estimation of some structural parameters (length and unsaturation) of various lipids in the thymus and their changes with age. An initial decrease of lipid metabolites in the thymus from 0.5 to 1 month of age was followed by large raises on further ageing, with 14, 8, and 4 fold increases for the total lipid content, fatty acids and glycerides, respectively, which correlated positively with age and negatively with thymus involution. The estimated average number of methylene groups per lipid chain essentially doubled its value from approximately 4-5 for the youngest mice to around 8 for the elderly, while the values obtained for the average number of double bonds per chain decreased with age from about 1-0.9 at 0.5/1 months of age to 0.6-0.7 for 18/24 months-old mice. The combination of NMR and histological data allowed studying the age-associated changes of the contribution of adipose- derived lipids to the total lipid content of the thymus and the amount of adipose tissue infiltrating the thymus. Both parameters initially showed a decrease from 0.5 months of age to (the adipose-free thymus at) 1 month of age. Afterwards, a continuous increase was observed on ageing: at 2 months about 55% of the lipids in the thymus were adipose-derived, while at 24 months they amounted to as much as about 95% of the total lipid content; for the same age-period, the estimated minimum adipose lipid content in the thymus changed from about 0.26% to 4.5%.
Collapse
Affiliation(s)
- Iago Pinal-Fernández
- Instituto de Investigaciones Sanitarias de Santiago, Departamento de Medicina, Facultad de Medicina, Universidad de Santiago de Compostela, Santiago de Compostela, Spain
| | | | | | | |
Collapse
|
26
|
García P, Martín-Pastor M, de Lera AR, Alvarez R. Determination of the geometry of acetoxyendiynes and acetoxyenynes by NMR heteronuclear (13)C-(1)H scalar couplings and (13)C NMR chemical shifts. Structural assignment of the oxylipin natural products peyssonenynes A and B. Magn Reson Chem 2010; 48:543-549. [PMID: 20535768 DOI: 10.1002/mrc.2618] [Citation(s) in RCA: 8] [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: 05/29/2023]
Abstract
Solution NMR methods were used for the structural characterization of the acetoxyendiyne E/Z configuration of the marine natural products peyssonenynes A and B and their synthetic analogs derived from palmitic acid. The scarcity of protons in the proximity of the olefin precluded the determination of the double bond geometry using (1)H NMR methods that rely on proton-proton scalar couplings or experiments such as NOESY or ROESY. Long range (1)H-(13)C heteronuclear scalar couplings, (n)J(CH), measured with the 2D excitation sculptured indirect detection experiment (EXSIDE) proved useful and highly reliable for the analysis of the enol acetate geometry. In addition, it was found that the chemical shift of some carbon atoms in the proximity of the olefin was also sensitive to the double bond configuration of these molecules providing an even simpler way to determine their geometry. This protocol showed its robustness by similar analysis of simpler silyl-protected acetoxyenynes derived from fatty acids. These NMR experimental results and stereochemical predictions were rationalized by DFT calculations.
Collapse
Affiliation(s)
- Patricia García
- Universidade de Vigo, Facultad de Química, Department of Organic Chemistry, As Lagoas-Marcosende, 36315 Vigo, Spain
| | | | | | | |
Collapse
|
27
|
Affiliation(s)
- Nuno Basilio
- Departamento de Química Física, Facultad de Química, Universidad de Santiago, 15782 Santiago, Spain, and Unidad de Resonancia Magnética, RIAIDT, Edif. CACTUS, Universidad de Santiago, 15782 Santiago, Spain
| | - Luis García-Río
- Departamento de Química Física, Facultad de Química, Universidad de Santiago, 15782 Santiago, Spain, and Unidad de Resonancia Magnética, RIAIDT, Edif. CACTUS, Universidad de Santiago, 15782 Santiago, Spain
| | - Manuel Martín-Pastor
- Departamento de Química Física, Facultad de Química, Universidad de Santiago, 15782 Santiago, Spain, and Unidad de Resonancia Magnética, RIAIDT, Edif. CACTUS, Universidad de Santiago, 15782 Santiago, Spain
| |
Collapse
|
28
|
Affiliation(s)
- Nuno Basilio
- Departamento de Química Física, Facultad de Química, Laboratorio Integral de Dinámica e Estructura de Biomoléculas José R. Carracido, Unidade de Resonancia Magnética, RIAIDT, Edif. CACTUS, Universidad de Santiago, 15782 Santiago, Spain
| | - Luis García-Río
- Departamento de Química Física, Facultad de Química, Laboratorio Integral de Dinámica e Estructura de Biomoléculas José R. Carracido, Unidade de Resonancia Magnética, RIAIDT, Edif. CACTUS, Universidad de Santiago, 15782 Santiago, Spain
| | - Manuel Martín-Pastor
- Departamento de Química Física, Facultad de Química, Laboratorio Integral de Dinámica e Estructura de Biomoléculas José R. Carracido, Unidade de Resonancia Magnética, RIAIDT, Edif. CACTUS, Universidad de Santiago, 15782 Santiago, Spain
| |
Collapse
|
29
|
Cobas JC, Bernstein MA, Martín-Pastor M, Tahoces PG. A new general-purpose fully automatic baseline-correction procedure for 1D and 2D NMR data. J Magn Reson 2006; 183:145-51. [PMID: 16891135 DOI: 10.1016/j.jmr.2006.07.013] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2006] [Revised: 07/05/2006] [Accepted: 07/13/2006] [Indexed: 05/11/2023]
Abstract
A new procedure for automatic baseline correction of NMR data sets is presented. It is based on an improved automatic recognition of signal-free regions that uses a Continuous Wavelet transform derivative calculation, followed by a baseline modelling procedure based on the Whittaker smoother algorithm. The method has been proven to automatically flatten 1D and 2D NMR spectra with large baseline distortions arising from different sources, is tolerant to low signal-to-noise ratio spectra, and to signals of varying widths in a single spectrum. Even though this procedure has so far only been applied to NMR spectra, we believe it to also be applicable to other spectroscopies having relatively narrow peaks (e.g., mass spectrometry), and potentially to those with broad peaks (e.g., near infrared or ultraviolet).
Collapse
Affiliation(s)
- J Carlos Cobas
- MESTRELAB RESEARCH, Xosé Pasín, 6-5C, 15706, Santiago de Compostela, Spain.
| | | | | | | |
Collapse
|
30
|
Martín-Pastor M, Vega-Vázquez M, De Capua A, Canales A, André S, Gabius HJ, Jiménez-Barbero J. Enhanced signal dispersion in saturation transfer difference experiments by conversion to a 1D-STD-homodecoupled spectrum. J Biomol NMR 2006; 36:103-9. [PMID: 17013681 DOI: 10.1007/s10858-006-9055-4] [Citation(s) in RCA: 2] [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] [Received: 01/25/2006] [Accepted: 07/07/2006] [Indexed: 05/12/2023]
Abstract
The saturation transfer difference (STD) experiment is a rich source of information on topological aspects of ligand binding to a receptor. The epitope mapping is based on a magnetization transfer after signal saturation from the receptor to the ligand, where interproton distances permit this process. Signal overlap in the STD spectrum can cause difficulties to correctly assign and/or quantitate the measured enhancements. To address this issue we report here a modified version of the routine experiment and a processing scheme that provides a 1D-STD homodecoupled spectrum (i.e. an experiment in which all STD signals appear as singlets) with line widths similar to those in original STD spectrum. These refinements contribute to alleviate problems of signal overlap. The experiment is based on 2D-J-resolved spectroscopy, one of the fastest 2D experiments under conventional data sampling in the indirect dimension, and provides excellent sensitivity, a key factor for the difference experiments.
Collapse
Affiliation(s)
- Manuel Martín-Pastor
- Laboratorio Integral de Dinámica e Estructura de Biomoléculas José R. Carracido, Unidade de Resonancia Magnética, Edificio CACTUS, RIAIDT, Universidade de Santiago de Compostela, 15706, Santiago de Compostela, Spain
| | | | | | | | | | | | | |
Collapse
|
31
|
Canales-Mayordomo A, Fayos R, Angulo J, Ojeda R, Martín-Pastor M, Nieto PM, Martín-Lomas M, Lozano R, Giménez-Gallego G, Jiménez-Barbero J. Backbone dynamics of a biologically active human FGF-1 monomer, complexed to a hexasaccharide heparin-analogue, by 15N NMR relaxation methods. J Biomol NMR 2006; 35:225-39. [PMID: 16937240 DOI: 10.1007/s10858-006-9024-y] [Citation(s) in RCA: 17] [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] [Subscribe] [Scholar Register] [Received: 12/12/2005] [Accepted: 04/26/2006] [Indexed: 05/11/2023]
Abstract
The binding site and backbone dynamics of a bioactive complex formed by the acidic fibroblast growth factor (FGF-1) and a specifically designed heparin hexasaccharide has been investigated by HSQC and relaxation NMR methods. The comparison of the relaxation data for the free and bound states has allowed showing that the complex is monomeric, and still induces mutagenesis, and that the protein backbone presents reduced motion in different timescale in its bound state, except in certain points that are involved in the interaction with the fibroblast growth factor receptor (FGFR).
Collapse
Affiliation(s)
- Angeles Canales-Mayordomo
- Departamento de Estructura y Función de Proteínas, Centro de Investigaciones Biológicas, CSIC, Ramiro de Maeztu, 9, 28006, Madrid, Spain
| | | | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Cobas JC, Constantino-Castillo V, Martín-Pastor M, del Río-Portilla F. A two-stage approach to automatic determination of 1H NMR coupling constants. Magn Reson Chem 2005; 43:843-8. [PMID: 16025552 DOI: 10.1002/mrc.1623] [Citation(s) in RCA: 7] [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] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
(1)H NMR scalar coupling constants are a rich source of information on molecular structure, but their extraction from spectra can be less than straightforward. Previous approaches to J extraction include methods proposed by Hoye, Golotvin, and the 'modified J-doubling' method. Here we describe the ACCA method, currently implemented in the NMR package MestReC, which allows a high degree of automation in the extraction of coupling patterns even in the case of complex multiplets with sublinewidth splitting. The new approach is illustrated by application to strychnine, for which it has detected previously unreported couplings.
Collapse
Affiliation(s)
- J C Cobas
- Mestrelab Research S.L., Xosé Pasín 6-5C. Santiago de Compostela, A coruña, 15706, Spain
| | | | | | | |
Collapse
|
33
|
Martín-Pastor M, Canales A, Corzana F, Asensio JL, Jiménez-Barbero J. Limited Flexibility of Lactose Detected from Residual Dipolar Couplings Using Molecular Dynamics Simulations and Steric Alignment Methods. J Am Chem Soc 2005; 127:3589-95. [PMID: 15755180 DOI: 10.1021/ja043445m] [Citation(s) in RCA: 45] [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: 11/30/2022]
Abstract
The conformational flexibility of lactose in solution has been investigated by residual dipolar couplings (RDCs). One-bond carbon-proton and proton-proton coupling constants have been measured in two oriented media and interpreted in combination with molecular dynamics simulations (MD). Two different approaches, known as PALES (Zweckstetter et al., J. Am. Chem. Soc. 2000, 122, 3791-3792) and TRAMITE (Azurmendi et al., J. Am. Chem. Soc. 2002, 124, 2426-2427), have been used to determine the alignment tensor from a shape-induced alignment model with the oriented medium. The steric alignment of the structures from several MD trajectories has provided ensemble averaged RDCs that have been compared with the experimental ones. The obtained results reveal the almost exclusive presence of a major low energy region defined as syn-phi/syn-psi (> 97%), for which sampling occurs in a dynamic manner. This result satisfactorily agrees with that determined by standard NOE-based methods.
Collapse
|
34
|
Cobas JC, Martín-Pastor M. A homodecoupled diffusion experiment for the analysis of complex mixtures by NMR. J Magn Reson 2004; 171:20-24. [PMID: 15504677 DOI: 10.1016/j.jmr.2004.07.016] [Citation(s) in RCA: 18] [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] [Subscribe] [Scholar Register] [Received: 06/03/2004] [Revised: 07/22/2004] [Indexed: 05/24/2023]
Abstract
Diffusion ordered spectroscopy (DOSY) relies on differences in translation diffusion as a means to separate components in a solution mixture. However, the analysis of spectra of mixtures can be problematic because spectral overlap. It is the aim of this article to propose a pulse sequence and processing method that leads to a complete 2D homodecoupled-DOSY experiment. This experiment offers several advantages that could extend the range of applications to more complex mixtures by achieving important improvements in both signal dispersion and sensitivity.
Collapse
Affiliation(s)
- J C Cobas
- Laboratorio Integral de Dinámica e Estructura de Biomoléculas José R. Carracido, Unidade de Resonancia Magnética, Edificio Cactus, RIAIDT, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain.
| | | |
Collapse
|
35
|
Garcia-Fuentes M, Torres D, Martín-Pastor M, Alonso MJ. Application of NMR spectroscopy to the characterization of PEG-stabilized lipid nanoparticles. Langmuir 2004; 20:8839-8845. [PMID: 15379515 DOI: 10.1021/la049505j] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The main purpose of the present work was to apply NMR techniques to characterize the nanostructural organization of a new drug nanocarrier composed of tripalmitin, lecithin, and poly(ethylene glycol) (PEG)-stearate. These nanocarriers were prepared by an emulsification-solvent evaporation technique and were characterized for their composition and nanostructural architecture. The results showed that tripalmitin, present in the core of the nanoparticles, is the main component of these systems, whereas PEG-stearate is firmly attached to the surface of the nanoparticles, forming a hydrated polymeric layer. Furthermore, the results indicate that, by selecting appropriately the composition of the lipid mixtures used for nanoparticle preparation, it was possible to modulate the PEG-coating density. This rigorous characterization by NMR provided very useful information about the architectural organization of this new colloidal drug carrier and showed the potential of modern NMR techniques for the characterization of core-coated nanostructures intended for drug delivery.
Collapse
Affiliation(s)
- Marcos Garcia-Fuentes
- Department of Pharmacy and Pharmaceutical Technology, School of Pharmacy, Unidade de Resonancia Magnética, RIAIDT, Edif. Cactus, University of Santiago de Compostela, 15782, Spain
| | | | | | | |
Collapse
|
36
|
Pérez-Méndez M, Berenguel RM, Garrido L, Martín-Pastor M. Self-Association and Stereoselectivity in a Chiral Liquid-Crystal Colesteric Polymer Formed under Achiral Conditions. Macromolecules 2003. [DOI: 10.1021/ma034982e] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mercedes Pérez-Méndez
- Instituto de Ciencia y Tecnología de Polímeros, CSIC, C/ Juan de la Cierva, 3. 28006 Madrid, Spain, and Laboratorio Integral de Estructura de Biomoléculas Jose. R. Carracido, Unidad de Resonancia Magnética, RIAIDT, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Roser Marsal Berenguel
- Instituto de Ciencia y Tecnología de Polímeros, CSIC, C/ Juan de la Cierva, 3. 28006 Madrid, Spain, and Laboratorio Integral de Estructura de Biomoléculas Jose. R. Carracido, Unidad de Resonancia Magnética, RIAIDT, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Leoncio Garrido
- Instituto de Ciencia y Tecnología de Polímeros, CSIC, C/ Juan de la Cierva, 3. 28006 Madrid, Spain, and Laboratorio Integral de Estructura de Biomoléculas Jose. R. Carracido, Unidad de Resonancia Magnética, RIAIDT, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Manuel Martín-Pastor
- Instituto de Ciencia y Tecnología de Polímeros, CSIC, C/ Juan de la Cierva, 3. 28006 Madrid, Spain, and Laboratorio Integral de Estructura de Biomoléculas Jose. R. Carracido, Unidad de Resonancia Magnética, RIAIDT, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| |
Collapse
|
37
|
Mikkelsen LM, Hernáiz MJ, Martín-Pastor M, Skrydstrup T, Jiménez-Barbero J. Conformation of glycomimetics in the free and protein-bound state: structural and binding features of the C-glycosyl analogue of the core trisaccharide alpha-D-Man-(1 --> 3)-[alpha-D-Man-(1 --> 6)]-D-Man. J Am Chem Soc 2002; 124:14940-51. [PMID: 12475336 DOI: 10.1021/ja020468x] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.1] [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: 11/29/2022]
Abstract
The conformational properties of the C-glycosyl analogue of the core trisaccharide alpha-D-Man-(1 --> 3)-[alpha-D-Man-(1 --> 6)]-D-Man in solution have been carefully analyzed by a combination of NMR spectroscopy and time-averaged restrained molecular dynamics. It has been found that both the alpha-1,3- and the alpha-1,6-glycosidic linkages show a major conformational averaging. Unusual Phi ca. 60 degrees orientations for both Phi torsion angles are found. Moreover, a major conformational distinction between the natural compound and the glycomimetic affects to the behavior of the omega(16) torsion angle around the alpha-1 --> 6-linkage. Despite this increased flexibility, the C-glycosyl analogue is recognized by three mannose binding lectins, as shown by NMR (line broadening, TR-NOE, and STD) and surface plasmon resonance (SPR) methods. Moreover, a process of conformational selection takes place, so that these lectins probably bind the glycomimetic similarly to the way they recognize the natural analogue. Depending upon the architecture and extension of the binding site of the lectin, loss or gain of binding affinity with respect to the natural analogue is found.
Collapse
Affiliation(s)
- Lise Munch Mikkelsen
- Department of Chemistry, University of Aarhus, Langelandsgade 140, 8000 Aarhus C, Denmark
| | | | | | | | | |
Collapse
|
38
|
Palomo C, Oiarbide M, Landa A, González-Rego MC, García JM, González A, Odriozola JM, Martín-Pastor M, Linden A. Design and synthesis of a novel class of sugar-peptide hybrids: C-linked glyco beta-amino acids through a stereoselective "acetate" Mannich reaction as the key strategic element. J Am Chem Soc 2002; 124:8637-43. [PMID: 12121105 DOI: 10.1021/ja026250s] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.8] [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
A new type of sugar-amino acid hybrid, which is comprised of a sugar unit (gluco-, galacto-, or mannopyranose) linked through a C-glycosidic linkage to the beta-position of an alpha-unsubstituted beta-amino acid unit, is presented. It is hypothesized that these new compounds, or the oligomeric peptides derived therefrom, might possess the structural features of beta-amino acid oligomers and the chemical and enzymatic resistance of C-glycosides to hydrolysis. The synthetic strategy is based on a new Mannich-type reaction between a chiral acetate enolate equivalent and alpha-amido sulfones derived from the corresponding sugar-C-glycoside aldehydes. While the sugar-C-glycoside aldehyde partner is prepared from well-established transformations on known sugar precursors, the lithium enolate derived from (1R)-endo-2-acetylisoborneol 3 is employed as the key element. This Mannich approach proceeds with essentially perfect diasteromeric control leading to the new beta-amino carbonyl adducts in good yields. Further, cleavage of the camphor auxiliary is smoothly performed by oxidative treatment with ammonium cerium nitrate (CAN). Complementarily, direct peptide-type coupling of the beta-amino carbonyl Mannich adducts with an alpha- or beta-amino acid residue and subsequent CAN-promoted detachment of the auxiliary yields dipeptide fragments bearing a sugar-containing aliphatic side chain and is a process that can be iterated. A preliminary conformational study based on the combination of experimental NMR data and molecular mechanics and molecular dynamics (MD) of one particular adduct is also provided.
Collapse
Affiliation(s)
- Claudio Palomo
- Departamento de Química Orgánica I, Facultad de Química, Universidad del País Vasco, Apdo. 1072, 20080 San Sebastián, Spain.
| | | | | | | | | | | | | | | | | |
Collapse
|
39
|
Poveda A, Asensio JL, Martín-Pastor M, Jiménez-Barbero J. Solution conformation and dynamics of a tetrasaccharide related to the Lewis(x) antigen deduced by NMR relaxation measurements. J Biomol NMR 1997; 10:29-43. [PMID: 9335114 DOI: 10.1023/a:1018395627017] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
1H-NMR cross-relaxation rates and nonselective longitudinal relaxation times have been obtained at two magnetic fields (7.0 and 11.8 T) and at a variety of temperatures for the branched tetrasaccharide methyl 3-O-alpha-N-acetyl-galactosaminyl-beta-galactopyranosyl-(1-->4)[3-O-alph a -fucosyl]-glucopyranoside (1), an inhibitor of astrocyte growth. In addition, 13C-NMR relaxation data have also been recorded at both fields. The 1H-NMR relaxation data have been interpreted using different motional models to obtain proton-proton correlation times. The results indicate that the GalNAc and Fuc rings display more extensive local motion than the two inner Glc and Gal moieties, since those present significantly shorter local correlation times. The 13C-NMR relaxation parameters have been interpreted in terms of the Lipari-Szabo model-free approach. Thus, order parameters and internal motion correlation times have been deduced. As obtained for the 1H-NMR relaxation data, the two outer residues possess smaller order parameters than the two inner rings. Internal correlation times are in the order of 100 ps. The hydroxymethyl groups have also different behaviour, with the exocyclic carbon on the glucopyranoside unit showing the highest S2. Molecular dynamics simulations using a solvated system have also been performed and internal motion correlation functions have been deduced from these calculations. Order parameters and interproton distances have been compared to those inferred from the NMR measurements. The obtained results are in fair agreement with the experimental data.
Collapse
Affiliation(s)
- A Poveda
- Servicio Interdepartamental de Investigación, Universidad Autónoma de Madrid, Cantoblanco, Spain
| | | | | | | |
Collapse
|
40
|
Poveda A, Asensio JL, Martín-Pastor M, Jiménez-Barbero J. Solution conformation and dynamics of a tetrasaccharide related to the Lewix(X) antigen deduced by 1H NMR NOESY, ROESY, and T-ROESY measurements. Carbohydr Res 1997; 300:3-10. [PMID: 9203332 DOI: 10.1016/s0008-6215(97)00034-7] [Citation(s) in RCA: 11] [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
The conformational and dynamical features of a Le(X) tetrasaccharide analogue GalNAc (alpha 1-3)Gal(beta 1-4)[Fuc(alpha 1-3)]Glc(beta OMe) 1 have been studied through 1H NMR relaxation measurements. The results indicate that the different glycosidic linkages of 1 present distinct conformational flexibility in solution. In addition, the use of T-ROESY experiments in conformational analysis of oligosaccharides is explored emphasizing its scope and limitations.
Collapse
Affiliation(s)
- A Poveda
- Servicio Interdepartamental de Investigación, Universidad Autónoma de Madrid, Spain
| | | | | | | |
Collapse
|
41
|
Robina I, López-Barba E, Jiménez-Barbero J, Martín-Pastor M, Fuentes J. Synthesis and conformational analysis of a lipotetrasaccharide related to the nodulation factor of Rhizobium bacteria. ACTA ACUST UNITED AC 1997. [DOI: 10.1016/s0957-4166(97)00108-0] [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: 11/16/2022]
|
42
|
Martín-Pastor M, Espinosa JF, Asensio JL, Jiménez-Barbero J. A comparison of the geometry and of the energy results obtained by application of different molecular mechanics force fields to methyl α-lactoside and the C-analogue of lactose. Carbohydr Res 1997. [DOI: 10.1016/s0008-6215(96)00225-x] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
43
|
Espinosa JF, Cañada FJ, Asensio JL, Martín-Pastor M, Dietrich H, Martín-Lomas M, Schmidt RR, Jiménez-Barbero J. Experimental Evidence of Conformational Differences between C-Glycosides and O-Glycosides in Solution and in the Protein-Bound State: The C-Lactose/O-Lactose Case. J Am Chem Soc 1996. [DOI: 10.1021/ja9603463] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Juan-Félix Espinosa
- Contribution from the Grupo de Carbohidratos, Instituto de Química Orgánica, CSIC, Juan de la Cierva 3, E-28006 Madrid, Spain, and Fakultät für Chemie der Universität Konstanz, Postfach 5560 M 725, D-78434 Konstanz, Germany
| | - F. Javier Cañada
- Contribution from the Grupo de Carbohidratos, Instituto de Química Orgánica, CSIC, Juan de la Cierva 3, E-28006 Madrid, Spain, and Fakultät für Chemie der Universität Konstanz, Postfach 5560 M 725, D-78434 Konstanz, Germany
| | - Juan Luis Asensio
- Contribution from the Grupo de Carbohidratos, Instituto de Química Orgánica, CSIC, Juan de la Cierva 3, E-28006 Madrid, Spain, and Fakultät für Chemie der Universität Konstanz, Postfach 5560 M 725, D-78434 Konstanz, Germany
| | - Manuel Martín-Pastor
- Contribution from the Grupo de Carbohidratos, Instituto de Química Orgánica, CSIC, Juan de la Cierva 3, E-28006 Madrid, Spain, and Fakultät für Chemie der Universität Konstanz, Postfach 5560 M 725, D-78434 Konstanz, Germany
| | - Hansjörg Dietrich
- Contribution from the Grupo de Carbohidratos, Instituto de Química Orgánica, CSIC, Juan de la Cierva 3, E-28006 Madrid, Spain, and Fakultät für Chemie der Universität Konstanz, Postfach 5560 M 725, D-78434 Konstanz, Germany
| | - Manuel Martín-Lomas
- Contribution from the Grupo de Carbohidratos, Instituto de Química Orgánica, CSIC, Juan de la Cierva 3, E-28006 Madrid, Spain, and Fakultät für Chemie der Universität Konstanz, Postfach 5560 M 725, D-78434 Konstanz, Germany
| | - Richard R. Schmidt
- Contribution from the Grupo de Carbohidratos, Instituto de Química Orgánica, CSIC, Juan de la Cierva 3, E-28006 Madrid, Spain, and Fakultät für Chemie der Universität Konstanz, Postfach 5560 M 725, D-78434 Konstanz, Germany
| | - Jesús Jiménez-Barbero
- Contribution from the Grupo de Carbohidratos, Instituto de Química Orgánica, CSIC, Juan de la Cierva 3, E-28006 Madrid, Spain, and Fakultät für Chemie der Universität Konstanz, Postfach 5560 M 725, D-78434 Konstanz, Germany
| |
Collapse
|
44
|
Poveda A, Asensio JL, Martín-Pastor M, Jiménez-Barbero J. Exploration of the conformational flexibility of the LeXrelated oligosaccharide GalNAcα(1→3)Galβ(1→4)[Fucα1→3)]Glc by1H NMR relaxation measurements and molecular dynamics simulations. Chem Commun (Camb) 1996. [DOI: 10.1039/cc9960000421] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
45
|
Martín-Pastor M, Asensio JL, López R, Jiménez-Barbero J. Conformational studies of a trisaccharide epitope in solution by using NMR spectroscopy and molecular mechanics and dynamics calculations with the MM3* program. ACTA ACUST UNITED AC 1995. [DOI: 10.1039/p29950000713] [Citation(s) in RCA: 4] [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: 11/21/2022]
|