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• W2073566521 abstract "Domain orientation and dynamics can play an essential role in the function of multidomain proteins. Lys48-linked polyubiquitin chains, the principal signal for proteasomal protein degradation, adopt a closed conformation at physiological conditions, in which the functionally important residues Leu8, Ile44, and Val70 are sequestered at the interdomain interface. This interface must open in order for these groups to become available for interactions with various chain-recognition factors. Knowledge of the mechanism of domain motion leading to the opening of the interdomain interface in polyubiqutin is, therefore, essential for the understanding of the processes controlling molecular recognition events in polyubiquitin signaling. Here we use NMR to characterize the interdomain dynamics that open the interface in a di-ubiquitin chain. This process occurs via domain reorientations on a 10-ns time scale and with the amplitudes that are sufficient for making functionally important hydrophobic residues in polyubiquitin available for direct interactions with various ubiquitin-binding factors. The analysis revealed the structures of the interconverting conformational states of di-ubiquitin and the rates and amplitudes of this process at near-physiological and acidic pH. The proposed mechanism of domain reorientation is quite general and could serve as a paradigm of interdomain mobility in other multidomain systems. Proteins 2006. © 2006 Wiley-Liss, Inc." @default.
• W2073566521 created "2016-06-24" @default.
• W2073566521 creator A5001283984 @default.
• W2073566521 creator A5067928809 @default.
• W2073566521 date "2006-02-14" @default.
• W2073566521 modified "2023-10-02" @default.
• W2073566521 title "Interdomain mobility in di-ubiquitin revealed by NMR" @default.
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• W2073566521 doi "https://doi.org/10.1002/prot.20917" @default.
• W2073566521 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16609980" @default.
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