Navegando por Autor "Souza, Beatriz Blenda Pinheiro de"
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Artigo Biochemical characterisation of a kunitz-type inhibitor from tamarindus indica L. seeds and its efficacy in reducing plasma leptin in an experimental model of obesity(Journal of Enzyme Inhibition and Medicinal Chemistry, 2018-01) Maciel, Bruna Leal Lima; Medeiros, Amanda Fernandes de; Costa, Izael de Sousa; Carvalho, Fabiana Maria Coimbra de; Kiyota, Sumika; Souza, Beatriz Blenda Pinheiro de; Sifuentes, Daniel Nogoceke; Serquiz, Raphael Paschoal; Uchôa, Adriana Ferreira; Santos, Elizeu Antunes dos; Morais, Ana Heloneida de AraújoA trypsin inhibitor isolated from tamarind seed (TTI) has satietogenic effects in animals, increasing the cholecystokinin (CCK) in eutrophy and reducing leptin in obesity. We purified TTI (pTTI), characterised, and observed its effect upon CCK and leptin in obese Wistar rats. By HPLC, and after amplification of resolution, two protein fractions were observed: Fr1 and Fr2, with average mass of [M þ 14H]þ ¼ 19,594,690 Da and [M þ 13H]þ ¼ 19,578,266 Da, respectively. The protein fractions showed 54 and 53 amino acid residues with the same sequence. pTTI presented resistance to temperature and pH variations; IC50 was 2.7 1010mol.L1 and Ki was 2.9 1011mol.L1 . The 2-DE revealed spots with isoelectric points between pH 5 and 6, and one near pH 8. pTTI action on leptin decrease was confirmed. We conclude that pTTI is a Kunitz trypsin inhibitor with possible biotechnological health-related applicationArtigo Structural insights and molecular dynamics into the inhibitory mechanism of a kunitz-type trypsin inhibitor from tamarindus indica L(Journal of Enzyme Inhibition and Medicinal Chemistry, 2021-01) Maciel, Bruna Leal Lima; Medeiros, Amanda Fernandes de; Souza, Beatriz Blenda Pinheiro de; Coutinho, Lucas Pinheiro; Murad, Aline Melro; Santos, Paula Ivani Medeiros dos; Monteiro, Norberto de Kássio Vieira; Santos, Elizeu Antunes dos; Morais, Ana Heloneida de AraújoTrypsin inhibitors from tamarind seed have been studied in vitro and in preclinical studies for the treatment of obesity, its complications and associated comorbidities. It is still necessary to fully understand the structure and behaviour of these molecules. We purifed this inhibitor, sequenced de novo by MALDI-TOF/ TOF, performed its homology modelling, and assessed the interaction with the trypsin enzyme through molecular dynamics (MD) simulation under physiological conditions. We identified additional 75 amino acid residues, reaching approximately 72% of total coverage. The four best conformations of the best homology modelling were submitted to the MD. The conformation n287 was selected considering the RMSD analysis and interaction energy (–301.0128 kcal.mol1 ). Residues Ile (54), Pro (57), Arg (59), Arg (63), and Glu (78) of pTTI presented the highest interactions with trypsin, and arginine residues were mainly involved in its binding mechanism. The results favour bioprospecting of this protein for pharmaceutical health applications