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de Medeiros AF, de Souza BBP, Coutinho LP, Murad AM, dos Santos PIM, Monteiro NDKV, dos Santos EA, Maciel BLL, de Araújo Morais AH. Structural insights and molecular dynamics into the inhibitory mechanism of a Kunitz-type trypsin inhibitor from Tamarindus indica L. J Enzyme Inhib Med Chem 2021; 36:480-490. [PMID: 33491503 PMCID: PMC7875565 DOI: 10.1080/14756366.2021.1876686] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Revised: 12/23/2020] [Accepted: 01/11/2021] [Indexed: 11/08/2022] Open
Abstract
Trypsin 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 n°287 was selected considering the RMSD analysis and interaction energy (-301.0128 kcal.mol-1). 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.
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Affiliation(s)
| | - Beatriz Blenda Pinheiro de Souza
- Postgraduate Biological Molecular, Institute of Biological Sciences, University of Brasília, Brasília, Brazil
- Laboratory of Mass Spectometry-LEM, Embrapa Genetic Resources and Biotechnology, Brasília, Brazil
| | | | - Aline Melro Murad
- Laboratory of Mass Spectometry-LEM, Embrapa Genetic Resources and Biotechnology, Brasília, Brazil
| | | | | | - Elizeu Antunes dos Santos
- Postgraduate Biochemistry Program, Biosciences Center, Federal University of Rio Grande do Norte, Natal, Brazil
- Department of Biochemistry, Biosciences Center, Federal University of Rio Grande, Natal, Brazil
- Tropical Medicine Institute, Federal University of Rio Grande do Norte, Natal, Brazil
| | - Bruna Leal Lima Maciel
- Postgraduate Nutrition Program, Center for Health Sciences, Federal University of Rio Grande do Norte, Natal, Brazil
- Department of Nutrition, Center for Health Sciences, Federal University of Rio Grande do Norte, Natal, Brazil
| | - Ana Heloneida de Araújo Morais
- Postgraduate Biochemistry Program, Biosciences Center, Federal University of Rio Grande do Norte, Natal, Brazil
- Postgraduate Nutrition Program, Center for Health Sciences, Federal University of Rio Grande do Norte, Natal, Brazil
- Department of Nutrition, Center for Health Sciences, Federal University of Rio Grande do Norte, Natal, Brazil
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Medeiros AFD, Costa IDS, Carvalho FMCD, Kiyota S, Souza BBPD, Sifuentes DN, Serquiz RP, Maciel BLL, Uchôa AF, Santos EAD, Morais AHDA. 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. J Enzyme Inhib Med Chem 2018; 33:334-348. [PMID: 29322840 PMCID: PMC6010142 DOI: 10.1080/14756366.2017.1419220] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [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] [Indexed: 12/29/2022] Open
Abstract
A 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 + 14H]+ = 19,594,690 Da and [M + 13H]+ = 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 × 10−10 mol.L−1 and Ki was 2.9 × 10−11 mol.L−1. 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 application.
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Affiliation(s)
- Amanda Fernandes de Medeiros
- a Postgraduate Biochemistry Program, Biosciences Center , Federal University of Rio Grande do Norte , Natal , Brazil
| | - Izael de Sousa Costa
- a Postgraduate Biochemistry Program, Biosciences Center , Federal University of Rio Grande do Norte , Natal , Brazil
| | | | - Sumika Kiyota
- b Laboratory of Protein and Peptide Biochemistry , CPDSA, Biological Institute , São Paulo , Brazil
| | - Beatriz Blenda Pinheiro de Souza
- c Postgraduate Biological Molecular, Institute of Biological Sciences , University of Brasília , Distrito Federal , Brasília , Brazil.,d Embrapa Genetic Resources and Biotechnology , Embrapa , Distrito Federal , Brasília , Brazil
| | | | - Raphael Paschoal Serquiz
- a Postgraduate Biochemistry Program, Biosciences Center , Federal University of Rio Grande do Norte , Natal , Brazil
| | - Bruna Leal Lima Maciel
- e Postgraduate Nutrition Program, Center for Health Sciences , Federal University of Rio Grande do Norte , Natal , Brazil.,f Department of Nutrition, Center for Health Sciences , Federal University of Rio Grande do Norte , Natal , Brazil
| | - Adriana Ferreira Uchôa
- a Postgraduate Biochemistry Program, Biosciences Center , Federal University of Rio Grande do Norte , Natal , Brazil.,g Department of Cell Biology and Genetics, Biosciences Center , Federal University of Rio Grande do Norte , Natal , Brazil
| | - Elizeu Antunes Dos Santos
- a Postgraduate Biochemistry Program, Biosciences Center , Federal University of Rio Grande do Norte , Natal , Brazil.,h Department of Biochemistry, Biosciences Center , Federal University of Rio Grande do Norte , Natal , Brazil
| | - Ana Heloneida de Araújo Morais
- a Postgraduate Biochemistry Program, Biosciences Center , Federal University of Rio Grande do Norte , Natal , Brazil.,e Postgraduate Nutrition Program, Center for Health Sciences , Federal University of Rio Grande do Norte , Natal , Brazil.,f Department of Nutrition, Center for Health Sciences , Federal University of Rio Grande do Norte , Natal , Brazil
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