Virus subversion of the MHC class I peptide-loading complex

Virus subversion of the MHC class I peptide-loading complex
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DOI:
10.1016/s1074-7613(02)00509-5
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发表时间:
2003-01-01
期刊:
影响因子:
32.4
通讯作者:
Hansen, TH
Hansen, TH
中科院分区:
医学1区
文献类型:
--
作者:
Lybarger, L;Wang, XL;Hansen, TH

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许多病毒蛋白调节 I 类表达,但一般来说,人们对它们特定 I 类识别的机制知之甚少。 γ(2)-疱疹病毒 68 的 mK3 蛋白通过泛素/蛋白酶体途径靶向降解新生 I 类分子。在这里,我们确定了 mK3 功能所需的 MHC I 类组装机器、TAP 和 Tapasin 的细胞成分。 mK3 无法在 TAP 或 tapasin 缺陷的细胞中调节 I 类,并且即使在 I 类不存在的情况下,mK3 也能与 TAP/tapasin 相互作用。mK3 的表达导致 TAP/tapasin 相关 1 类泛素化,而无法进行 TAP/tapasin 相互作用的 I 类突变体不受 mK3 的影响。因此,mK3 颠覆 TAP/tapasin,专门针对 I 类分子进行破坏。
Many viral proteins modulate class I expression, yet, in general, their mechanisms of specific class I recognition are poorly understood. The mK3 protein of gamma(2)-Herpesvirus 68 targets the degradation of nascent class I molecules via the ubiquitin/proteasome pathway. Here, we identify cellular components of the MHC class I assembly machinery, TAP and tapasin, that are required for mK3 function. mK3 failed to regulate class I in TAP-or tapasin-deficient cells, and mK3 interacted with TAP/tapasin, even in the absence of class I. Expression of mK3 resulted in the ubiquitination of TAP/tapasin-associated class 1, and mutants of class I incapable of TAP/tapasin interaction were unaffected by mK3. Thus, mK3 subverts TAP/tapasin to specifically target class I molecules for destruction.