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Multiple physical techniques to structurally characterize biological relevant membranes and its interactions

Grant number: 21/01593-1
Support Opportunities:Regular Research Grants
Duration: June 01, 2021 - November 30, 2023
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Maria Teresa Moura Lamy
Grantee:Maria Teresa Moura Lamy
Host Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated researchers: Erix Alexander Milán Garcés ; Evandro Luiz Duarte ; Julio Henrique Kravcuks Rozenfeld


In the last many years, we have focused on the study of structural properties of amphiphilic dispersions, and its interactions with biomolecules. Accordingly, we built up a rather well-equipped laboratory, with the appropriate physical techniques, mostly financed by FAPESP. The present proposal is concerned about fundamental studies, but also focuses on the better understanding of the biological activity of the systems under study, the structure-activity relationship, aiming at the development of new drugs and vaccines. We propose the continuity of different subjects where we have contributed, but where there are still many interesting opened questions. In the last years, we significantly contributed to the understanding of anionic lipid dispersions. But we still need to finish the discussion about dispersions of dimyristoyl phosphatidyl glycerol, as we have new evidences that contradict models proposed in the literature. Our studies with the fluorescent probes Prodan and Laurdan brought important contributions to the understanding of the localization of these probes in cationic membranes of DODAB. We also brought to the literature a new proposal for the origin of the two fluorescent bands of the probes in simple solvents. Now, we intend to continue this study, both experimental and theoretical, focusing on the fluorescent properties of the probes in different membrane systems, to help on the interpretation of their fluorescent spectra in biological relevant model membranes. Considering that the cationic lipid DODAB is an immunogenic agent, we propose the structural study of mixed dispersions of DODAB and lysophosphatidyl colines, the latter also known to be able to modulate the immune system. Still in collaboration with biologists and biochemists, we intend to study the structural alterations caused by a few biomolecules on models of cell membrane: antraquinones, the protein crotoxin, antimicrobial peptides and fluoroquinolones. Our final goal is a better understanding of the mechanisms of action of these molecules. (AU)

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Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MARQUEZIN, CASSIA A.; TERESA LAMY, M.; DE SOUZA, EDUARDO S.. Molecular collisions or resonance energy transfer in lipid vesicles? A methodology to tackle this question. JOURNAL OF MOLECULAR LIQUIDS, v. 341, . (21/01593-1, 18/20162-9, 14/50983-3, 17/25930-1)
MATOS, FERNANDA LIMA; DUARTE, EVANDRO L.; MUNIZ, GABRIEL S. V.; MILAN-GARCES, ERIX ALEXANDER; COUTINHO, KALINE; LAMY, M. TERESA; DA CUNHA, ANTONIO R.. Spectroscopic characterization of different protonation/deprotonation states of Barbaloin in aqueous solution. SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, v. 286, p. 11-pg., . (17/25930-1, 14/50983-3, 18/20162-9, 21/01593-1, 17/03910-9, 21/09016-3)
DE ANDRADE, LUCAS; DUARTE, EVANDRO L.; LAMY, TERESA; ROZENFELD, JULIO H. K.. Thermotropic Behavior and Structural Organization of C24:1 Sulfatide Dispersions and Its Mixtures with Cationic Bilayers. ACS OMEGA, v. N/A, p. 10-pg., . (16/19077-1, 16/13368-4, 20/01417-6, 14/50983-3, 21/01593-1)
MUNIZ, GABRIEL S. VIGNOLI; DUARTE, EVANDRO L.; LORENZON, ESTEBAN N.; CILLI, EDUARDO M.; LAMY, M. TERESA. What different physical techniques can disclose about disruptions on membrane structure caused by the antimicrobial peptide Hylin a1 and a more positively charged analogue. Chemistry and Physics of Lipids, v. 243, p. 16-pg., . (17/25930-1, 18/20162-9, 14/50983-3, 21/01593-1)

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