c-Src binds to the cancer drug Ruxolitinib with an active conformation.

c-Src binds to the cancer drug Ruxolitinib with an active conformation.
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c-Src 以活性构象与癌症药物 Ruxolitinib 结合

DOI:
10.1371/journal.pone.0106225
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Fan XG
Fan XG
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Duan Y;Chen L;Chen Y;Fan XG

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癌症药物Ruxolitinib是一种有效的janus激酶抑制剂,被批准用于治疗骨髓增生性肿瘤。此外,Ruxolitinib对一组其他激酶(包括Src激酶)具有弱抑制活性。没有Ruxolitinib与任何激酶结合的结构信息。本文以2.26 μ m的分辨率测定了Ruxolitinib复合物中c-Src激酶结构域的晶体结构。C-Src激酶结构域在Ruxolitinib结合后采用DFG-in活性构象,表明Ruxolitinib是c-Src的I型抑制剂。Ruxolitinib与Met 341形成两个氢键,与Thr 338形成水介导的氢键,与c-Src形成多个货车范德华接触。然后将鲁索利替尼对接到先前解析的JAK 1结构的配体结合口袋中。根据对接结果,Ruxolitinib也作为I型抑制剂结合JAK 1,与c-Src相比,与JAK 1的配体结合口袋具有更多的相互作用和更高的形状互补性。由于Ruxolitinib是一种相对较小的抑制剂,并且Ruxolitinib和c-Src配体结合口袋之间存在相当大的空腔,因此我们建议修饰Ruxolitinib以开发更有效的c-Src抑制剂。
The cancer drug Ruxolitinib is a potent janus kinase inhibitor approved for the treatment of the myeloproliferative neoplasms. In addition, Ruxolitinib has weak inhibitory activity against a panel of other kinases, including Src kinase. There is no structural information of Ruxolitinib binding to any kinase. In this paper, we determined the crystal structure of c-Src kinase domain in complex of Ruxolitinib at a resolution of 2.26 Å. C-Src kinase domain adopts the DFG-in active conformation upon Ruxolitinib binding, indicating Ruxolitinib is a type I inhibitor for c-Src. Ruxolitinib forms two hydrogen bonds with Met341, a water-mediated hydrogen bond with Thr338, and a number of van der Waals contacts with c-Src. Ruxolitinib was then docked into the ligand-binding pocket of a previously solved JAK1 structure. From the docking result, Ruxolitinib also binds JAK1 as a type I inhibitor, with more interactions and a higher shape complementarity with the ligand-binding pocket of JAK1 compared to that of c-Src. Since Ruxolitinib is a relatively small inhibitor and there is sizeable cavity between Ruxolitinib and c-Src ligand-binding pocket, we propose to modify Ruxolitinib to develop more potent inhibitors to c-Src.
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