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
中科院分区:
文献类型:
--
作者:
Chang BH;Gujral TS;Karp ES;BuKhalid R;Grantcharova VP;MacBeath G
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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