Cholesterol is important for a post-adsorption step in the entry process of transmissible gastroenteritis virus.

Cholesterol is important for a post-adsorption step in the entry process of transmissible gastroenteritis virus.
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胆固醇对于传染性胃肠炎病毒进入过程中的吸附后步骤很重要

DOI:
10.1016/j.antiviral.2010.10.002
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发表时间:
2010-12
期刊:
影响因子:
7.6
通讯作者:
Ren X
Ren X
中科院分区:
医学2区
文献类型:
--
作者:
Yin J;Glende J;Schwegmann-Wessels C;Enjuanes L;Herrler G;Ren X

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胆固醇是耐去垢剂膜微区 (DRM) 的主要成分。我们将传染性胃肠炎病毒 (TGEV) 刺突 (S) 蛋白定位在病毒包膜的 DRM 中。尽管冷的非离子去污剂不会溶解 S 蛋白,但当甲基-β-环糊精 (MβCD) 从病毒膜上去除胆固醇时,这种行为没有改变,并且在浮选分析中该蛋白不与细胞 DRM 标记蛋白共迁移。因此,S 蛋白并未锚定在病毒膜 DRM 中,因为已知它们存在于质膜中。病毒膜上的胆固醇消耗可能不会影响吸附过程,因为 MβCD 处理后唾液酸结合活性和氨肽酶 N 的结合都没有减少。仅当吸附过程发生在 37°C 时,才观察到胆固醇耗尽的 TGEV 的感染性降低,但在 4°C 下应用病毒时则没有观察到。胆固醇对于吸附后步骤很重要,它允许膜重排,促进病毒进入。
Cholesterol is a major constituent of detergent-resistant membrane microdomains (DRMs). We localized transmissible gastroenteritis virus (TGEV) spike (S) protein in DRMs in the viral envelope. Though S protein was not solubilized by cold non-ionic detergents, this behavior was unchanged when cholesterol was depleted from viral membrane by methyl-β-cyclodextrin (MβCD) and the protein did not comigrate with cellular DRM marker proteins in flotation analyses. Therefore, the S protein is not anchored in the viral membrane DRMs as they are known to occur in the plasma membrane. Cholesterol depletion from viral membrane may not affect the adsorption process as neither the sialic acid binding activity nor the binding to aminopeptidase N was reduced post-MβCD treatment. Reduced infectivity of cholesterol-depleted TGEV was observed only when the adsorption process occurred at 37 °C but not when the virus was applied at 4 °C. Cholesterol is important for a post-adsorption step, allowing membrane rearrangements that facilitate virus entry.
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