6K4I

The partially disordered conformation of ubiquitin (Q41N variant)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 1900 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 

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Literature

Paramagnetic relaxation enhancement-assisted structural characterization of a partially disordered conformation of ubiquitin.

Wakamoto, T.Ikeya, T.Kitazawa, S.Baxter, N.J.Williamson, M.P.Kitahara, R.

(2019) Protein Sci 28: 1993-2003

  • DOI: 10.1002/pro.3734
  • Primary Citation of Related Structures:  
    6K4I

  • PubMed Abstract: 
  • Nuclear magnetic resonance (NMR) is a powerful tool to study three-dimensional structures as well as protein conformational fluctuations in solution, but it is compromised by increases in peak widths and missing signals. We previously reported that ubiqu ...

    Nuclear magnetic resonance (NMR) is a powerful tool to study three-dimensional structures as well as protein conformational fluctuations in solution, but it is compromised by increases in peak widths and missing signals. We previously reported that ubiquitin has two folded conformations, N 1 and N 2 and plus another folded conformation, I, in which some amide group signals of residues 33-41 almost disappeared above 3 kbar at pH 4.5 and 273 K. Thus, well-converged structural models could not be obtained for this region owing to the absence of distance restraints. Here, we reexamine the problem using the ubiquitin Q41N variant as a model for this locally disordered conformation, I. We demonstrate that the variant shows pressure-induced loss of backbone amide group signals at residues 28, 33, 36, and 39-41 like the wild-type, with a similar but smaller effect on CαH and CβH signals. In order to characterize this I structure, we measured paramagnetic relaxation enhancement (PRE) under high pressure to obtain distance restraints, and calculated the structure assisted by Bayesian inference. We conclude that the more disordered I conformation observed at pH 4.0, 278 K, and 2.5 kbar largely retained the N 2 conformation, although the amide groups at residues 33-41 have more heterogeneous conformations and more contact with water, which differ from the N 1 and N 2 states. The PRE-assisted strategy has the potential to improve structural characterization of proteins that lack NMR signals, especially for relatively more open and hydrated protein conformations.


    Organizational Affiliation

    College of Pharmaceutical Sciences, Ritsumeikan University, Kusatsu, Shiga, Japan.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ubiquitin A76Homo sapiensMutation(s): 1 
Gene Names: UBB
Find proteins for P0CG47 (Homo sapiens)
Explore P0CG47 
Go to UniProtKB:  P0CG47
NIH Common Fund Data Resources
PHAROS:  P0CG47
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 1900 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations 
  • OLDERADO: 6K4I Olderado

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Other governmentJapan--

Revision History 

  • Version 1.0: 2019-10-30
    Type: Initial release