US3 protein kinase of HSV-1 cycles between the cytoplasm and nucleus and interacts with programmed cell death protein 4 (PDCD4) to block apoptosis

被引:51
作者
Wang, Xiaojia [1 ]
Patenode, Caroline [1 ]
Roizman, Bernard [1 ]
机构
[1] Univ Chicago, Marjorie B Kovler Viral Oncol Labs, Chicago, IL 60637 USA
关键词
innate immunity; nuclear cytoplasmic shuttling; INHIBITS TRANSLATION; SUPPRESSOR PROTEIN; VIRUS; HERPES-SIMPLEX-VIRUS-1; ACTIVATION; MUTANT; INITIATION; INFECTION; BINDING; EGRESS;
D O I
10.1073/pnas.1111942108
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The U(S)3 protein kinase of herpes simplex virus 1 plays a key role in blocking apoptosis induced by viral gene products or exogenous agents. The U(S)3 protein kinase is similar to protein kinase A with respect to substrate range and specificity. We report that in the yeast two-hybrid system a domain of U(S)3 essential for antiapoptotic activity reacted with programmed cell death protein 4 (PDCD4). We report that U(S)3 interacts with PDCD4, that PDCD4 is posttranslationally modified in infected cells both in a U(S)3-dependent and -independent fashion, and that depletion of PDCD4 by siRNA blocked apoptosis induced by Delta alpha 4 mutant virus. In infected cells, PDCD4 accumulates in the nucleus, whereas U(S)3 accumulates in the cytoplasm. Studies designed to elucidate the convergence of these proteins led to the discovery that U(S)3 protein kinase cycles between the nucleus and cytoplasm and that U(S)3 retains PDCD4 in infected cell nuclei.
引用
收藏
页码:14632 / 14636
页数:5
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