期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 282, 期 16, 页码 11795-11804出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M610430200
关键词
-
资金
- NCI NIH HHS [CA085289, R01 CA085289] Funding Source: Medline
- NHLBI NIH HHS [R01 HL054118, HL54118, R01 HL054118-08] Funding Source: Medline
- NIDDK NIH HHS [R01 DK062810-03, DK062810, R01 DK062810] Funding Source: Medline
Death-associated protein kinase ( DAPK) has been found associated with HSP90, and inhibition of HSP90 with 17-alkylamino-17-demethoxygeldanamycin reduced expression of DAPK. These results were extended to determine whether the degradation of DAPK in the absence of HSP90 activity is dependent on the ubiquitin-proteasome pathway. Our results show that treatment of cells with geldanamycin ( GA) leads to degradation of DAPK, and this degradation is attenuated by the proteasome inhibitor, lactacystin. GA-induced DAPK degradation is also dependent on phosphorylation of DAPK at Ser(308), and the cellular levels of phospho( Ser(308))-DAPK dramatically increase in response to GA treatment. Expression of two distinct ubiquitin E3 ligases, carboxyl terminus of HSC70-interacting protein ( CHIP) or DIP1/Mib1, enhanced DAPK degradation, and conversely, short interfering RNA depletion of either CHIP or DIP1/Mib1 attenuated DAPK degradation. In vitro ubiquitination assays confirmed that DAPK is targeted for ubiquitination by both CHIP and DIP. Consistent with these results, DAPK is found in two distinct immune complexes, one containing HSP90 and CHIP and a second complex containing only DIP1/Mib. Collectively, these results indicate that strict modulation of DAPK activities is critical for regulation of apoptosis and cellular homeostasis.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据