Cited by 60Ubiquitin and proteasome pathwaysProtein Structure and DynamicsEnzyme Structure and Function

Lys63-linked ubiquitin chain adopts multiple conformational states for specific target recognition

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Liu, Zhu, Gong, Zhou, Jiang, Wen-Xue, Yang, Ju, Zhu, Wen-Kai, Guo, Da-Chuan, Zhang, Wei-Ping, Liu, Mai-Li +1 more·2015·eLife

Abstract

A polyubiquitin comprises multiple covalently linked ubiquitins and recognizes myriad targets. Free or bound to ligands, polyubiquitins are found in different arrangements of ubiquitin subunits. To understand the structural basis for polyubiquitin quaternary plasticity and to explore the target recognition mechanism, we characterize the conformational space of Lys63-linked diubiquitin (K63-Ub2). Refining against inter-subunit paramagnetic NMR data, we show that free K63-Ub2 exists as a dynamic ensemble comprising multiple closed and open quaternary states. The quaternary dynamics enables K63-Ub2 to be specifically recognized in a variety of signaling pathways. When binding to a target protein, one of the preexisting quaternary states is selected and stabilized. A point mutation that shifts the equilibrium between the different states modulates the binding affinities towards K63-Ub2 ligands. This conformational selection mechanism at the quaternary level may be used by polyubiquitins of different lengths and linkages for target recognition.

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Authors
Liu, Z., Gong, Z., Jiang, W.-X., Yang, J., Zhu, W.-K., Guo, D.-C., Zhang, W.-P., Liu, M.-L., & Tang, C.
Affiliations
  • Chinese Academy of Sciences (CN)
  • CAS Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Wuhan Institute of Physics and Mathematics of the Chinese Academy of Sciences, Wuhan, China
  • Department of Pharmacology and Institute of Neuroscience, Zhejiang University School of Medicine, Hangzhou, China
Corresponding author
Tang, Chun
Venue
eLife
Published
2015-06-19
Volume
4
ISSN
2050-084X (ISSN-L)
OpenAlex
W1949401050
Cited by
60
References
58
Citations by year
2026: 2 · 2025: 7 · 2024: 3 · 2023: 5 · 2022: 3 · 2021: 2 · 2020: 13 · 2019: 6 · 2018: 4 · 2017: 7 · 2016: 7 · 2015: 1
FWCI
2.75
Type
journal article
Language
en
Open access
Locations
  • eLife (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Ministry of Science and Technology of the People's Republic of China (2013CB910200)
  • National Natural Science Foundation of China (31225007, 31170728)
  • Howard Hughes Medical Institute (HHMI) (International Early Career Scientist)
  • China Postdoctoral Science Foundation (2015M571860)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
Keywords
diubiquitin, polyubiquitin, quaternary structure, conformational selection, target recognition, ubiquitination, paramagnetic NMR, conformational dynamics, binding affinity, point mutations
MeSH terms
Humans, Kinetics, Magnetic Resonance Spectroscopy, Protein Binding, Protein Conformation, Ubiquitin, Protein Multimerization

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