Background: U-box-containing proteins cooperate with chaperones in ubiquitinating irreversibly unfolded proteins. Results: Retinoblastoma binding protein-6 (RBBP6) contains a zinc-binding U-box-like domain and interacts directly with chaperones. Conclusion: RBBP6 may play a role in protein quality control. Significance: U-boxes should be classified in terms of their interaction with chaperones and not their zinc binding properties.
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