A systematic family-wide investigation reveals that ~30% of mammalian PDZ domains engage in PDZ-PDZ interactions.

A systematic family-wide investigation reveals that ~30% of mammalian PDZ domains engage in PDZ-PDZ interactions.
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DOI:
10.1016/j.chembiol.2011.06.013
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发表时间:
2011-09-23
影响因子:
--
通讯作者:
MacBeath G
MacBeath G
中科院分区:
生物1区
文献类型:
--
作者:
Chang BH;Gujral TS;Karp ES;BuKhalid R;Grantcharova VP;MacBeath G

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PDZ结构域是独立折叠的模块,其通常通过结合至其靶蛋白的C末端来介导蛋白质-蛋白质相互作用。然而,在少数情况下,已报道PDZ结构域与其他PDZ结构域二聚化。为了进一步研究这种非经典结合模式,我们使用包含几乎每个小鼠PDZ结构域的蛋白质微阵列来系统地查询所有可能的PDZ-PDZ对。然后,我们使用荧光偏振来重新测试和量化新的相互作用,并使用共亲和纯化来测试在其全长蛋白质的背景下生物药理学验证的相互作用。总的来说,我们发现了37个PDZ-PDZ相互作用,涉及46个PDZ结构域(约占所有测试的PDZ结构域的30%),揭示了二聚化是一种比以前更常用的结合模式。这表明许多PDZ结构域通过同时与一个以上的配体相互作用而进化形成多蛋白复合物。
PDZ domains are independently folded modules that typically mediate protein-protein interactions by binding to the C-termini of their target proteins. In a few instances, however, PDZ domains have been reported to dimerize with other PDZ domains. To investigate this noncanonical binding mode further, we used protein microarrays comprising virtually every mouse PDZ domain to systematically query all possible PDZ-PDZ pairs. We then used fluorescence polarization to retest and quantify novel interactions and co-affinity purification to test biophysically validated interactions in the context of their full-length proteins. Overall, we discovered 37 PDZ-PDZ interactions involving 46 PDZ domains (~30% of all PDZ domains tested), revealing that dimerization is a more frequently used binding mode than was previously appreciated. This suggests that many PDZ domains evolved to form multiprotein complexes by simultaneously interacting with more than one ligand.
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