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