Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 7 de 7
Filtrar
Mais filtros

Base de dados
Tipo de documento
Intervalo de ano de publicação
1.
Nature ; 498(7455): 521-5, 2013 Jun 27.
Artigo em Inglês | MEDLINE | ID: mdl-23739335

RESUMO

The hepatitis C virus (HCV) has developed a small membrane protein, p7, which remarkably can self-assemble into a large channel complex that selectively conducts cations. We wanted to examine the structural solution that the viroporin adopts in order to achieve selective cation conduction, because p7 has no homology with any of the known prokaryotic or eukaryotic channel proteins. The activity of p7 can be inhibited by amantadine and rimantadine, which are potent blockers of the influenza M2 channel and licensed drugs against influenza infections. The adamantane derivatives have been used in HCV clinical trials, but large variation in drug efficacy among the various HCV genotypes has been difficult to explain without detailed molecular structures. Here we determine the structures of this HCV viroporin as well as its drug-binding site using the latest nuclear magnetic resonance (NMR) technologies. The structure exhibits an unusual mode of hexameric assembly, where the individual p7 monomers, i, not only interact with their immediate neighbours, but also reach farther to associate with the i+2 and i+3 monomers, forming a sophisticated, funnel-like architecture. The structure also points to a mechanism of cation selection: an asparagine/histidine ring that constricts the narrow end of the funnel serves as a broad cation selectivity filter, whereas an arginine/lysine ring that defines the wide end of the funnel may selectively allow cation diffusion into the channel. Our functional investigation using whole-cell channel recording shows that these residues are critical for channel activity. NMR measurements of the channel-drug complex revealed six equivalent hydrophobic pockets between the peripheral and pore-forming helices to which amantadine or rimantadine binds, and compound binding specifically to this position may allosterically inhibit cation conduction by preventing the channel from opening. Our data provide a molecular explanation for p7-mediated cation conductance and its inhibition by adamantane derivatives.


Assuntos
Hepacivirus/química , Proteínas Virais/química , Adamantano/análogos & derivados , Adamantano/química , Adamantano/metabolismo , Adamantano/farmacologia , Sítios de Ligação , Difusão , Microscopia Eletrônica , Modelos Biológicos , Modelos Moleculares , Ressonância Magnética Nuclear Biomolecular , Porosidade , Rimantadina/química , Rimantadina/metabolismo , Rimantadina/farmacologia , Relação Estrutura-Atividade , Proteínas Virais/antagonistas & inibidores , Proteínas Virais/metabolismo , Proteínas Virais/ultraestrutura
2.
J Am Chem Soc ; 139(51): 18432-18435, 2017 12 27.
Artigo em Inglês | MEDLINE | ID: mdl-29193965

RESUMO

HIV-1 envelope spike (Env) is a type I membrane protein that mediates viral entry. Recent studies showed that its transmembrane domain (TMD) forms a trimer in lipid bilayer whose structure has several peculiar features that remain difficult to explain. One is the presence of an arginine R696 in the middle of the TM helix. Additionally, the N- and C-terminal halves of the TM helix form trimeric cores of opposite nature (hydrophobic and hydrophilic, respectively). Here we determined the membrane partition and solvent accessibility of the TMD in bicelles that mimic a lipid bilayer. Solvent paramagnetic relaxation enhancement analysis showed that the R696 is indeed positioned close to the center of the bilayer, but, surprisingly, can exchange rapidly with water as indicated by hydrogen-deuterium exchange measurements. The solvent accessibility of R696 is likely mediated by the hydrophilic core, which also showed fast water exchange. In contrast, the N-terminal hydrophobic core showed extremely slow solvent exchange, suggesting the trimer formed by this region is extraordinarily stable. Our data explain how R696 is accommodated in the middle of the membrane while reporting the overall stability of the Env TMD trimer in lipid bilayer.


Assuntos
Membrana Celular/química , Proteína gp41 do Envelope de HIV/química , Multimerização Proteica , Água/química , Sequência de Aminoácidos , Membrana Celular/metabolismo , Medição da Troca de Deutério , Interações Hidrofóbicas e Hidrofílicas , Bicamadas Lipídicas/química , Bicamadas Lipídicas/metabolismo , Domínios Proteicos , Estabilidade Proteica , Solventes/química , Internalização do Vírus
3.
Chemistry ; 23(6): 1361-1367, 2017 Jan 26.
Artigo em Inglês | MEDLINE | ID: mdl-27747952

RESUMO

Structural characterization of transmembrane proteins in isotropic bicelles has become an increasingly popular application of solution NMR spectroscopy, as the fast-tumbling bicelles are membrane-like, yet can often yield spectral quality comparable to those of detergent micelles. While larger bicelles are closer to the true lipid bilayer, it remains unclear how large the bicelles need to be to allow accurate assessment of the protein transmembrane partition in the lipid bilayer. Here, we address the above question from the perspective of the protein residing in the bicelles, through systematic measurement of the protein chemical shift and transmembrane partition at different lipid/detergent ratios (q), ranging from 0.3 to 0.7, using the transmembrane domain of the human Fas receptor as model system. We found that the lipid environment of the bicelles, as reflected by the protein chemical shift, begins to be perturbed when q is reduced to below 0.6. We also implemented a solvent paramagnetic relaxation enhancement (PRE) approach for bicelles to show that the protein transmembrane partition in bicelles with q=0.5 and 0.7 are very similar, but at q=0.3 the solvent PRE profile is significantly different. Our data indicate that q values between 0.5 and 0.6 are a good compromise between high resolution NMR and closeness to the membrane environment, and allow accurate characterization of the protein position in the lipid bilayer.


Assuntos
Bicamadas Lipídicas/química , Espectroscopia de Ressonância Magnética , Receptor fas/química , Dimiristoilfosfatidilcolina/química , Compostos Heterocíclicos/química , Compostos Heterocíclicos/metabolismo , Humanos , Bicamadas Lipídicas/metabolismo , Compostos Organometálicos/química , Compostos Organometálicos/metabolismo , Éteres Fosfolipídicos/química , Proteínas Recombinantes/biossíntese , Proteínas Recombinantes/química , Proteínas Recombinantes/isolamento & purificação , Receptor fas/genética , Receptor fas/metabolismo
4.
J Biomol NMR ; 61(3-4): 369-78, 2015 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-25724842

RESUMO

The p7 membrane protein encoded by hepatitis C virus (HCV) assembles into a homo-hexamer that selectively conducts cations. An earlier solution NMR structure of the hexameric complex revealed a funnel-like architecture and suggests that a ring of conserved asparagines near the narrow end of the funnel are important for cation interaction. NMR based drug-binding experiments also suggest that rimantadine can allosterically inhibit ion conduction via a molecular wedge mechanism. These results suggest the presence of dilation and contraction of the funnel tip that are important for channel activity and that the action of the drug is attenuating this motion. Here, we determined the conformational dynamics and solvent accessibility of the p7 channel. The proton exchange measurements show that the cavity-lining residues are largely water accessible, consistent with the overall funnel shape of the channel. Our relaxation dispersion data show that residues Val7 and Leu8 near the asparagine ring are subject to large chemical exchange, suggesting significant intrinsic channel breathing at the tip of the funnel. Moreover, the hinge regions connecting the narrow and wide regions of the funnel show strong relaxation dispersion and these regions are the binding sites for rimantadine. Presence of rimantadine decreases the conformational dynamics near the asparagine ring and the hinge area. Our data provide direct observation of µs-ms dynamics of the p7 channel and support the molecular wedge mechanism of rimantadine inhibition of the HCV p7 channel.


Assuntos
Antivirais/metabolismo , Hepacivirus/metabolismo , Rimantadina/metabolismo , Proteínas Virais/metabolismo , Canais Iônicos/metabolismo , Proteínas de Membrana/metabolismo , Ressonância Magnética Nuclear Biomolecular , Conformação Proteica/efeitos dos fármacos , Proteínas Virais/química
5.
Structure ; 26(4): 627-634.e4, 2018 04 03.
Artigo em Inglês | MEDLINE | ID: mdl-29551287

RESUMO

The p7 protein of the hepatitis C virus (HCV) can oligomerize in membrane to form cation channels. Previous studies showed that the channel assembly in detergent micelles adopts a unique flower-shaped oligomer, but the unusual architecture also presented problems for understanding how this viroporin resides in the membrane. Moreover, the oligomeric state of p7 remains controversial, as both hexamer and heptamer have been proposed. Here we address the above issues using p7 reconstituted in bicelles that mimic a lipid bilayer. We found, using a recently developed oligomer-labeling method, that p7 forms hexamers in the bicelles. Solvent paramagnetic relaxation enhancement analyses showed that the bilayer thickness around the HCV ion channel is substantially smaller than expected, and thus a significant portion of the previously assigned membrane-embedded region is solvent exposed. Our study provides an effective approach for characterizing the transmembrane partition of small ion channels in near lipid bilayer environment.


Assuntos
Materiais Biomiméticos/química , Dimiristoilfosfatidilcolina/química , Hepacivirus/química , Canais Iônicos/química , Bicamadas Lipídicas/química , Éteres Fosfolipídicos/química , Proteínas Virais/química , Motivos de Aminoácidos , Sítios de Ligação , Materiais Biomiméticos/metabolismo , Clonagem Molecular , Cristalografia por Raios X , Dimiristoilfosfatidilcolina/metabolismo , Escherichia coli/genética , Escherichia coli/metabolismo , Expressão Gênica , Vetores Genéticos/química , Vetores Genéticos/metabolismo , Hepacivirus/metabolismo , Canais Iônicos/genética , Canais Iônicos/metabolismo , Bicamadas Lipídicas/metabolismo , Modelos Moleculares , Éteres Fosfolipídicos/metabolismo , Ligação Proteica , Conformação Proteica em alfa-Hélice , Domínios e Motivos de Interação entre Proteínas , Multimerização Proteica , Proteínas Recombinantes de Fusão/química , Proteínas Recombinantes de Fusão/genética , Proteínas Recombinantes de Fusão/metabolismo , Proteínas Virais/genética , Proteínas Virais/metabolismo
6.
Science ; 353(6295): 172-175, 2016 Jul 08.
Artigo em Inglês | MEDLINE | ID: mdl-27338706

RESUMO

HIV-1 envelope spike (Env) is a type I membrane protein that mediates viral entry. We used nuclear magnetic resonance to determine an atomic structure of the transmembrane (TM) domain of HIV-1 Env reconstituted in bicelles that mimic a lipid bilayer. The TM forms a well-ordered trimer that protects a conserved membrane-embedded arginine. An amino-terminal coiled-coil and a carboxyl-terminal hydrophilic core stabilize the trimer. Individual mutations of conserved residues did not disrupt the TM trimer and minimally affected membrane fusion and infectivity. Major changes in the hydrophilic core, however, altered the antibody sensitivity of Env. These results show how a TM domain anchors, stabilizes, and modulates a viral envelope spike and suggest that its influence on Env conformation is an important consideration for HIV-1 immunogen design.


Assuntos
Proteína gp41 do Envelope de HIV/química , HIV-1/fisiologia , Fusão de Membrana , Internalização do Vírus , Arginina/química , Arginina/genética , Anticorpos Anti-HIV/imunologia , Proteína gp41 do Envelope de HIV/genética , Proteína gp41 do Envelope de HIV/imunologia , HIV-1/imunologia , Bicamadas Lipídicas/química , Mutação , Ressonância Magnética Nuclear Biomolecular , Multimerização Proteica , Estabilidade Proteica , Estrutura Terciária de Proteína
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA