Structural and functional analyses of minimal phosphopeptides targeting the polo-box domain of polo-like kinase 1.

Structural and functional analyses of minimal phosphopeptides targeting the polo-box domain of polo-like kinase 1.
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针对 polo 样激酶 1 的 polo-box 结构域的最小磷酸肽的结构和功能分析。

DOI:
10.1038/nsmb.1628
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发表时间:
2009-08
影响因子:
16.8
通讯作者:
Lee, Kyung S.
Lee, Kyung S.
中科院分区:
生物学1区
文献类型:
--
作者:
Yun, Sang-Moon;Moulaei, Tinoush;Lim, Dan;Bang, Jeong K.;Park, Jung-Eun;Shenoy, Shilpa R.;Liu, Fa;Kang, Young H.;Liao, Chenzhong;Soung, Nak-Kyun;Lee, Sunhee;Yoon, Do-Young;Lim, Yoongho;Lee, Dong-Hee;Otaka, Akira;Appella, Ettore;McMahon, James B.;Nicklaus, Marc C.;Burke, Terrence R., Jr.;Yaffe, Michael B.;Wlodawer, Alexander;Lee, Kyung S.

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Plk1在细胞增殖中起着关键作用,被认为是抗癌治疗的一个有吸引力的靶点。Plk1的非催化polo-box结构域(PBD)形成蛋白-蛋白相互作用的磷酸化表位结合模块。在这里,我们报告了与Plk1的PBD特异性相互作用的最小磷酸肽的鉴定,而不是两个密切相关的Plk2和Plk3。对Plk1 PBD与最小磷酸肽复合物晶体结构的比较结合研究和分析表明,c端SpT二肽是一个高亲和力的锚点,而n端残基对于相互作用的特异性和亲和力至关重要。磷酸化-苏氨酸模拟肽对Plk1 PBD的抑制足以诱导有丝分裂阻滞和凋亡细胞死亡。因此,最小肽和PBD相互作用的模式可能为设计抗plk1治疗剂提供模板。
Plk1 plays a pivotal role in cell proliferation and is considered an attractive target for anti-cancer therapy. The noncatalytic polo-box domain (PBD) of Plk1 forms a phosphoepitope-binding module for protein-protein interaction. Here, we report the identification of minimal phosphopeptides that specifically interacted with the PBD of Plk1, but not the two closely-related Plk2 and Plk3. Comparative binding studies and analyses of crystal structures of the Plk1 PBD in complex with the minimal phosphopeptides revealed that the C-terminal SpT dipeptide functions as a high affinity anchor, whereas the N-terminal residues are critical for providing both specificity and affinity to the interaction. Inhibition of the Plk1 PBD by phospho-Thr mimetic peptides was sufficient to induce mitotic arrest and apoptotic cell death. Thus, the mode of the minimal peptide and PBD interaction may provide a template for designing anti-Plk1 therapeutic agents.
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