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DDB1 Functions As a Linker to Recruit Receptor WD40 Proteins to CUL4-ROC1 Ubiquitin Ligases

Overview
Journal Genes Dev
Specialty Molecular Biology
Date 2006 Nov 3
PMID 17079684
Citations 199
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Abstract

Cullins assemble the largest family of ubiquitin ligases by binding with ROC1 and various substrate receptors. CUL4 function is linked with many cellular processes, but its substrate-recruiting mechanism remains elusive. We identified a protein motif, the DWD box (DDB1-binding WD40 protein), and demonstrated the binding of 15 DWD proteins with DDB1-CUL4A. We provide evidence supporting the critical function of the DWD box and DDB1's role as the linker mediating DWD protein association with CUL4A. A database search predicts that about one-third of WD40 proteins, 90 in humans, contain the DWD box, suggesting a potentially large number of DWD-DDB1-CUL4-ROC1 E3 ligases.

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