1
|
Nunes LO, Munhoz VHO, Sousa AA, de Souza KR, Santos TL, Bemquerer MP, Ferreira DEC, de Magalhães MTQ, Resende JM, Alcântara AFC, Aisenbrey C, Veloso DP, Bechinger B, Verly RM. High-resolution structural profile of hylaseptin-4: Aggregation, membrane topology and pH dependence of overall membrane binding process. Biochim Biophys Acta Biomembr 2021; 1863:183581. [PMID: 33556358 DOI: 10.1016/j.bbamem.2021.183581] [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] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 01/20/2021] [Accepted: 02/03/2021] [Indexed: 12/11/2022]
Abstract
Hylaseptin-4 (HSP-4, GIGDILKNLAKAAGKAALHAVGESL-NH2) is an antimicrobial peptide originally isolated from Hypsiboas punctatus tree frog. The peptide has been chemically synthetized for structural investigations by CD and NMR spectroscopies. CD experiments reveal the high helical content of HSP-4 in biomimetic media. Interestingly, the aggregation process seems to occur at high peptide concentrations either in aqueous solution or in presence of biomimetic membranes, indicating an increase in the propensity of the peptide for adopting a helical conformation. High-resolution NMR structures determined in presence of DPC-d38 micelles show a highly ordered α-helix from amino acid residues I2 to S24 and a smooth bend near G14. A large separation between hydrophobic and hydrophilic residues occurs up to the A16 residue, from which a shift in the amphipathicity is noticed. Oriented solid-state NMR spectroscopy show a roughly parallel orientation of the helical structure along the POPC lipid bilayer surface, with an insertion of the hydrophobic N-terminus into the bilayer core. Moreover, a noticeable pH dependence of the aggregation process in both aqueous and in biomimetic membrane environments is attributed to a single histidine residue (H19). The protonation degree of the imidazole side-chain might help in modulating the peptide-peptide or peptide-lipid interactions. Finally, molecular dynamics simulations confirm the orientation and preferential helical conformation and in addition, show that HSP-4 tends to self-aggregate in order to stabilize its active conformation in aqueous or phospholipid bilayer environments.
Collapse
Affiliation(s)
- L O Nunes
- Departamento de Química, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39100-000 Diamantina, MG, Brazil
| | - V H O Munhoz
- Instituto de Ciência e Tecnologia, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39100-000 Diamantina, MG, Brazil
| | - A A Sousa
- Departamento de Química, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39100-000 Diamantina, MG, Brazil
| | - K R de Souza
- Departamento de Química, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39100-000 Diamantina, MG, Brazil
| | - T L Santos
- Departamento de Química, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39100-000 Diamantina, MG, Brazil
| | - M P Bemquerer
- Embrapa Recursos Genéticos e Biotecnologia, Parque Estação Biológica, PqEB, Av. W5 Norte (final), P.O. Box 02372, Brasília, DF, Brazil
| | - D E C Ferreira
- Departamento de Química, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39100-000 Diamantina, MG, Brazil; Departamento de Química, Universidade Federal de Minas Gerais, P.O. Box 486, 31270-901 Belo Horizonte, MG, Brazil
| | - Mariana T Q de Magalhães
- Departamento de Bioquímica e Imunologia, Laboratório de Biofísica de Macromoléculas Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, MG, Brazil
| | - J M Resende
- Departamento de Química, Universidade Federal de Minas Gerais, P.O. Box 486, 31270-901 Belo Horizonte, MG, Brazil
| | - A F C Alcântara
- Departamento de Química, Universidade Federal de Minas Gerais, P.O. Box 486, 31270-901 Belo Horizonte, MG, Brazil
| | - C Aisenbrey
- Université de Strasbourg/CNRS, UMR7177, Institut de Chimie, 67000 Strasbourg, France
| | - D P Veloso
- Departamento de Química, Universidade Federal de Minas Gerais, P.O. Box 486, 31270-901 Belo Horizonte, MG, Brazil
| | - B Bechinger
- Université de Strasbourg/CNRS, UMR7177, Institut de Chimie, 67000 Strasbourg, France; Institut Universitaire de France (IUF), France
| | - R M Verly
- Departamento de Química, Universidade Federal dos Vales do Jequitinhonha e Mucuri, 39100-000 Diamantina, MG, Brazil.
| |
Collapse
|
2
|
Araújo CRR, Silva RR, Silva TM, Takahashi JA, Sales-Junior PA, Dessimoni-Pinto NAV, Souza-Fagundes EM, Romanha AJ, Murta SMF, Alcântara AFC. Constituents from stem barks of Luehea ochrophylla Mart and evaluation of their antiparasitic, antimicrobial, and antioxidant activities. Nat Prod Res 2016; 31:1948-1953. [PMID: 27966397 DOI: 10.1080/14786419.2016.1266346] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Luehea species are found in almost all Central and South American countries. The present work describes the phytochemical study, isolation, and structural characterisation of friedelin, β-friedelinol, lupeol, pseudotaraxasterol, β-sitosterol, betulinic acid, taraxasterol, (-)-epicatechin, β-sitosterol-3-O-β-d-glucopyranoside, and (+)-epicatechin-(4β→8)-epicatechin from stem barks of Luehea ochrophylla Mart. The structural identification of the isolated compounds was mainly performed by NMR analyses and comparison with the data from literature. These compounds were isolated for the first time in the genus Luehea, except β-sitosterol glucopyranoside, (-)-epicatechin, and lupeol. Hexane extract (HE) and dichloromethane (DF) and ethyl acetate (AF) fractions exhibited antiparasitic activity against amastigote (intracellular) and trypomastigote culture forms of Trypanosoma cruzi. The ethanol extract (EE), DF, and ethanol fraction (EF) exhibited considerable antifungal activity against Candida albicans. Moreover, extracts and fractions exhibited significant percentage of capture free radicals of 2,2-diphenyl-picrylhydrazyl (DPPH) when compared to the standard of ascorbic acid.
Collapse
Affiliation(s)
- C R R Araújo
- a Departamento de Química , Instituto de Ciências Exatas, Universidade Federal de Minas Gerais , Belo Horizonte , Brazil
| | - R R Silva
- b Departamento de Química , Universidade Federal dos Vales do Jequitinhonha e Mucuri , Diamantina , Brazil
| | - T M Silva
- a Departamento de Química , Instituto de Ciências Exatas, Universidade Federal de Minas Gerais , Belo Horizonte , Brazil
| | - J A Takahashi
- a Departamento de Química , Instituto de Ciências Exatas, Universidade Federal de Minas Gerais , Belo Horizonte , Brazil
| | - P A Sales-Junior
- c Laboratório de Parasitologia Celular e Molecular , Centro de Pesquisas René Rachou-Fiocruz , Belo Horizonte , Brazil
| | - N A V Dessimoni-Pinto
- d Departamento de Nutrição , Universidade Federal dos Vales do Jequitinhonha e Mucuri , Diamantina , Brazil
| | - E M Souza-Fagundes
- e Departamento de Fisiologia e Biofísica , Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais , Belo Horizonte , Brazil
| | - A J Romanha
- c Laboratório de Parasitologia Celular e Molecular , Centro de Pesquisas René Rachou-Fiocruz , Belo Horizonte , Brazil
| | - S M F Murta
- c Laboratório de Parasitologia Celular e Molecular , Centro de Pesquisas René Rachou-Fiocruz , Belo Horizonte , Brazil
| | - A F C Alcântara
- a Departamento de Química , Instituto de Ciências Exatas, Universidade Federal de Minas Gerais , Belo Horizonte , Brazil
| |
Collapse
|
3
|
Alcântara AFC, Silveira D, Chiari E, Oliveira AB, Guimarães JE, Raslan DS. Comparative analysis of the trypanocidal activity and chemical properties of E-lychnophoric acid and its derivatives using theoretical calculations. Eclet Quím 2005. [DOI: 10.1590/s0100-46702005000300005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
E-Lychnophoric acid 1, its derivative ester 2 and alcohol 3 killed 100% of trypomastigote blood forms of Trypanosoma cruzi at the concentrations of 13.86, 5.68, and 6.48 µg/mL, respectively. Conformational distribution calculations (AM1) of 1, 2 and 3 gave minimum energies for the conformers a, b, c, and d, which differ from each other only in the cyclononene ring geometry. Calculations (DFT/BLYP/6-31G*) of geometry optimization and chemical properties were performed for conformers of 1, 2, and 3. The theoretical results were numerically compared to the trypanocidal activity. Calculated values of atomic charge, orbital population, and vibrational frequencies showed that the C-4-C-5 pi-endocyclic bond does not affect the trypanocidal activity of the studied compounds. Nevertheless, the structure of the group at C-4 strongly influences the activity. However, the theoretical results indicated that the intra-ring (C-1 and C-9) and pi-exocycle (C-8 and C-14) carbons of caryophyllene-type structures promote the trypanocidal activity of these compounds.
Collapse
Affiliation(s)
| | | | - E. Chiari
- Universidade Federal de Minas Gerais
| | | | | | | |
Collapse
|