Structure Based Design of a Grp94-Selective Inhibitor: Exploiting a Key Residue in Grp94 To Optimize Paralog-Selective Binding.

Structure Based Design of a Grp94-Selective Inhibitor: Exploiting a Key Residue in Grp94 To Optimize Paralog-Selective Binding.
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DOI:
10.1021/acs.jmedchem.7b01608
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发表时间:
2018-04-12
影响因子:
7.3
通讯作者:
Gewirth DT
Gewirth DT
中科院分区:
医学1区
文献类型:
--
作者:
Que NLS;Crowley VM;Duerfeldt AS;Zhao J;Kent CN;Blagg BSJ;Gewirth DT

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Grp94 和 Hsp90(ER 和细胞质 hsp90 旁系同源物)共享一个保守的 ATP 结合袋,已成为治疗的靶点。旁系同源选择性抑制剂可能会产生副作用更少的药物。在这里,我们分析了 1 (BnIm)(一种苄基咪唑间苯二酚抑制剂)的结合模式。 1 与 Hsp90 和 Grp94 结合的结构揭示了 Grp94 的巨大构象变化,但暴露位点 2 的 Hsp90 没有,位点 2 是一个与中央 ATP 空腔相邻的结合袋,通常被堵塞。 Grp94:1 结构揭示了插入暴露位点 2 的间苯二酚支架的翻转姿势。我们利用这种翻转的结合姿势开发了 1 的 Grp94 选择性衍生物。我们的结构分析表明,配体将其苄基咪唑取代基插入位点 1(ATP 结合腔的不同侧袋)的能力是暴露 Grp94 中位点 2 的关键。
Grp94 and Hsp90, the ER and cytoplasmic hsp90 paralogs, share a conserved ATP-binding pocket that has been targeted for therapeutics. Paralog-selective inhibitors may lead to drugs with fewer side effects. Here, we analyzed 1 (BnIm), a benzyl imidazole resorcinylic inhibitor, for its mode of binding. The structures of 1 bound to Hsp90 and Grp94 reveal large conformational changes in Grp94, but not Hsp90 that expose Site 2, a binding pocket adjacent to the central ATP cavity that is ordinarily blocked. The Grp94:1 structure reveals a flipped pose of the resorcinylic scaffold that inserts into the exposed Site 2. We exploited this flipped binding pose to develop a Grp94-selective derivative of 1. Our structural analysis shows that the ability of the ligand to insert its benzyl imidazole substituent into Site 1, a different side pocket off the ATP binding cavity, is the key to exposing Site 2 in Grp94.
DOI: 10.1002/chem.201703398
发表时间: 2017-11-07
期刊: Chemistry (Weinheim an der Bergstrasse, Germany)
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