2RSU

Alternative structure of Ubiquitin

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

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Literature

Solution Structure of the Q41N Variant of Ubiquitin as a Model for the Alternatively Folded N2 State of Ubiquitin

Kitazawa, S., Kameda, T., Yagi-Utsumi, M., Sugase, K., Baxter, N.J., Kato, K., Williamson, M.P., Kitahara, R.

(2013) Biochemistry 52: 1874-1885

  • DOI: 10.1021/bi301420m
  • Primary Citation of Related Structures:  
    2RSU

  • PubMed Abstract: 

    • It is becoming increasingly clear that proteins transiently populate high-energy excited states as a necessary requirement for function. Here, we demonstrate that rational mutation based on the characteristics of the structure and dynamics of protein ...

    It is becoming increasingly clear that proteins transiently populate high-energy excited states as a necessary requirement for function. Here, we demonstrate that rational mutation based on the characteristics of the structure and dynamics of proteins obtained from pressure experiments is a new strategy for amplifying particular fluctuations in proteins. We have previously shown that ubiquitin populates a high-energy conformer, N2, at high pressures. Here, we show that the Q41N mutation favors N2: high-pressure nuclear magnetic resonance (NMR) shows that N2 is ∼70% populated in Q41N but only ∼20% populated in the wild type at ambient pressure. This allows us to characterize the structure of N2, in which α1-helix, the following loop, β3-strand, and β5-strand change their orientations relative to the remaining regions. Conformational fluctuation on the microsecond time scale, characterized by (15)N spin relaxation NMR analysis, is markedly increased for these regions of the mutant. The N2 conformers produced by high pressure and by the Q41N mutation are quite similar in both structure and dynamics. The conformational change to produce N2 is proposed to be a novel dynamic feature beyond the known recognition dynamics of the protein. Indeed, it is orthogonal to that seen when proteins containing a ubiquitin-interacting motif bind at the hydrophobic patch of ubiquitin but matches changes seen on binding to the E2 conjugating enzyme. More generally, structural and dynamic effects of hydrodynamic pressure are shown to be useful for characterizing functionally important intermediates.

    Organizational Affiliation: 

    College of Pharmaceutical Sciences, Ritsumeikan University , Kusatsu 525-8577, Japan.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
UbiquitinA76Homo sapiensMutation(s): 1 
Gene Names: UBC, UBA52, UBCEP2
Find proteins for P62987 (Homo sapiens)
Explore P62987 
Go to UniProtKB:  P62987
NIH Common Fund Data Resources
PHAROS  P62987
GTEx  ENSG00000221983
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 2RSU Olderado

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-03-27
    Type: Initial release