3TGP

Room temperature H-ras


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.31 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.169 

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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Accessing protein conformational ensembles using room-temperature X-ray crystallography.

Fraser, J.S.van den Bedem, H.Samelson, A.J.Lang, P.T.Holton, J.M.Echols, N.Alber, T.

(2011) Proc Natl Acad Sci U S A 108: 16247-16252

  • DOI: https://doi.org/10.1073/pnas.1111325108
  • Primary Citation of Related Structures:  
    3TGP

  • PubMed Abstract: 

    Modern protein crystal structures are based nearly exclusively on X-ray data collected at cryogenic temperatures (generally 100 K). The cooling process is thought to introduce little bias in the functional interpretation of structural results, because cryogenic temperatures minimally perturb the overall protein backbone fold. In contrast, here we show that flash cooling biases previously hidden structural ensembles in protein crystals. By analyzing available data for 30 different proteins using new computational tools for electron-density sampling, model refinement, and molecular packing analysis, we found that crystal cryocooling remodels the conformational distributions of more than 35% of side chains and eliminates packing defects necessary for functional motions. In the signaling switch protein, H-Ras, an allosteric network consistent with fluctuations detected in solution by NMR was uncovered in the room-temperature, but not the cryogenic, electron-density maps. These results expose a bias in structural databases toward smaller, overpacked, and unrealistically unique models. Monitoring room-temperature conformational ensembles by X-ray crystallography can reveal motions crucial for catalysis, ligand binding, and allosteric regulation.


  • Organizational Affiliation

    Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720-3220, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GTPase HRas166Homo sapiensMutation(s): 0 
Gene Names: HRASHRAS1
UniProt & NIH Common Fund Data Resources
Find proteins for P01112 (Homo sapiens)
Explore P01112 
Go to UniProtKB:  P01112
PHAROS:  P01112
GTEx:  ENSG00000174775 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01112
Sequence Annotations
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.31 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.166 
  • R-Value Observed: 0.169 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.1α = 90
b = 40.1β = 90
c = 160.6γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-10-12
    Type: Initial release
  • Version 1.1: 2018-01-24
    Changes: Structure summary
  • Version 1.2: 2024-02-28
    Changes: Data collection, Database references, Derived calculations