Structural analysis of MDM2 RING separates degradation from regulation of p53 transcription activity.
Structural analysis of MDM2 RING separates degradation from regulation of p53 transcription activity.
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DOI:
10.1038/nsmb.3414
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发表时间:
2017-07
影响因子:
16.8
通讯作者:
Huang DT
中科院分区:
文献类型:
--
作者:
Nomura K;Klejnot M;Kowalczyk D;Hock AK;Sibbet GJ;Vousden KH;Huang DT
MDM2-MDMX complexes bind the p53 tumor suppressor protein, inhibiting p53’s transcriptional activity and targeting p53 for proteasomal degradation. Inhibitors that disrupt binding between p53 and MDM2 efficiently activate a p53 response although their use in the treatment of cancers that retain wild type p53 may be limited by on-target toxicities due to p53 activation in normal tissue. Guided by a novel crystal structure of the MDM2-MDMX-E2(UbcH5B)–ubiquitin complex, we designed MDM2 mutants that prevent E2–ubiquitin binding without altering the RING domain structure. These mutants lose MDM2’s E3 activity, but retain the ability to limit p53's transcriptional activity and allow cell proliferation. Cells expressing these mutants responded more quickly to cellular stress than cells expressing wild type MDM2. Targeting the MDM2 E3 ligase activity could widen the therapeutic window of p53 activation in tumors, since rapid p53 induction can be achieved while basal p53 control by MDM2 is maintained.
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DOI:
10.1107/s0907444904019158
发表时间:
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影响因子:
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