[PMID]: | 28956592 |
[Au] Autor: | Sousa IP; Carvalho CAM; Mendes YS; Weissmuller G; Oliveira AC; Gomes AMO |
[Ad] Endereço: | Instituto de Bioquímica Médica Leopoldo de Meis, Centro de Ciências da Saúde and ‡Instituto de Biofísica Carlos Chagas Filho, Centro de Ciências da Saúde, Universidade Federal do Rio de Janeiro , Rio de Janeiro, Rio de Janeiro 21941-902, Brazil. |
[Ti] Título: | Fusion of a New World Alphavirus with Membrane Microdomains Involving Partially Reversible Conformational Changes in the Viral Spike Proteins. |
[So] Source: | Biochemistry;56(43):5823-5830, 2017 Oct 31. |
[Is] ISSN: | 1520-4995 |
[Cp] País de publicação: | United States |
[La] Idioma: | eng |
[Ab] Resumo: | Alphaviruses are enveloped arboviruses mainly proposed to infect host cells by receptor-mediated endocytosis followed by fusion between the viral envelope and the endosomal membrane. The fusion reaction is triggered by low pH and requires the presence of both cholesterol and sphingolipids in the target membrane, suggesting the involvement of lipid rafts in the cell entry mechanism. In this study, we show for the first time the interaction of an enveloped virus with membrane microdomains isolated from living cells. Using Mayaro virus (MAYV), a New World alphavirus, we verified that virus fusion to these domains occurred to a significant extent upon acidification, although its kinetics was quite slow when compared to that of fusion with artificial liposomes demonstrated in a previous work. Surprisingly, when virus was previously exposed to acidic pH, a condition previously shown to inhibit alphavirus binding and fusion to target membranes as well as infectivity, and then reneutralized, its ability to fuse with membrane microdomains at low pH was retained. Interestingly, this observation correlated with a partial reversion of low pH-induced conformational changes in viral proteins and retention of virus infectivity upon reneutralization. Our results suggest that MAYV entry into host cells could alternatively involve internalization via lipid rafts and that the conformational changes triggered by low pH in the viral spike proteins during the entry process are partially reversible. |
[Mh] Termos MeSH primário: |
Alphavirus/química Lipossomos/química Fusão de Membrana Microdomínios da Membrana/química Proteínas Virais de Fusão/química Internalização do Vírus
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[Mh] Termos MeSH secundário: |
Alphavirus/metabolismo Concentração de Íons de Hidrogênio Microdomínios da Membrana/metabolismo Proteínas Virais de Fusão/metabolismo
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[Pt] Tipo de publicação: | JOURNAL ARTICLE |
[Nm] Nome de substância:
| 0 (Liposomes); 0 (Viral Fusion Proteins) |
[Em] Mês de entrada: | 1711 |
[Cu] Atualização por classe: | 171103 |
[Lr] Data última revisão:
| 171103 |
[Sb] Subgrupo de revista: | IM |
[Da] Data de entrada para processamento: | 170929 |
[St] Status: | MEDLINE |
[do] DOI: | 10.1021/acs.biochem.7b00650 |
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