A promiscuous alpha-helical motif anchors viral hijackers and substrate receptors to the CUL4-DDB1 ubiquitin ligase machinery.
A promiscuous alpha-helical motif anchors viral hijackers and substrate receptors to the CUL4-DDB1 ubiquitin ligase machinery.
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DOI:
10.1038/nsmb.1719
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发表时间:
2010-01
影响因子:
16.8
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中科院分区:
文献类型:
--
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The CUL4-DDB1 ubiquitin ligase machinery regulates diverse cellular functions and is frequently subverted by pathogenic viruses. Here we report the crystal structure of DDB1 in complex with a central fragment of hepatitis B virus X protein (HBx), whose DDB1-binding activity is essential for viral infection. The structure reveals that HBx binds DDB1 through an α-helical motif, which is also found in the unrelated paramyxovirus SV5-V protein despite their sequence divergence. Our structure-based functional analysis shows that, like SV5-V, HBx captures DDB1 to exploit the ubiquitin ligase activity of the CUL4-DDB1 E3. Based on the shared action mechanisms of the two viral proteins, we further identify the same α-helical motif in the substrate-recruiting subunits of the cellular E3 complex, DCAFs, which are functionally mimicked by the viral hijackers. Together, our studies reveal a common yet promiscuous structural element important for the assembly of viral and cellular substrate receptors into the core complex of the CUL4-DDB1 ubiquitin ligase.
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