4WYN

The crystal structure of the A109G mutant of RNase A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.805 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.146 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Perturbation of the Conformational Dynamics of an Active-Site Loop Alters Enzyme Activity.

Gagne, D.French, R.L.Narayanan, C.Simonovic, M.Agarwal, P.K.Doucet, N.

(2015) Structure 23: 2256-2266

  • DOI: 10.1016/j.str.2015.10.011
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The role of internal dynamics in enzyme function is highly debated. Specifically, how small changes in structure far away from the reaction site alter protein dynamics and overall enzyme mechanisms is of wide interest in protein engineering. Using RN ...

    The role of internal dynamics in enzyme function is highly debated. Specifically, how small changes in structure far away from the reaction site alter protein dynamics and overall enzyme mechanisms is of wide interest in protein engineering. Using RNase A as a model, we demonstrate that elimination of a single methyl group located >10 Å away from the reaction site significantly alters conformational integrity and binding properties of the enzyme. This A109G mutation does not perturb structure or thermodynamic stability, both in the apo and ligand-bound states. However, significant enhancement in conformational dynamics was observed for the bound variant, as probed over nano- to millisecond timescales, resulting in major ligand repositioning. These results illustrate the large effects caused by small changes in structure on long-range conformational dynamics and ligand specificities within proteins, further supporting the importance of preserving wild-type dynamics in enzyme systems that rely on flexibility for function.


    Organizational Affiliation

    INRS-Institut Armand-Frappier, Université du Québec, 531 Boulevard des Prairies, Laval, QC H7V 1B7, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ribonuclease pancreatic
A, B
125Bos taurusMutation(s): 1 
Gene Names: RNASE1 (RNS1)
EC: 4.6.1.18
Find proteins for P61823 (Bos taurus)
Go to Gene View: RNASE1
Go to UniProtKB:  P61823
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.805 Å
  • R-Value Free: 0.203 
  • R-Value Work: 0.146 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 76.174α = 90.00
b = 51.435β = 90.00
c = 58.221γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PDB_EXTRACTdata extraction
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesR01GM105978

Revision History 

  • Version 1.0: 2015-11-18
    Type: Initial release
  • Version 1.1: 2015-11-25
    Type: Database references
  • Version 1.2: 2015-12-30
    Type: Database references
  • Version 1.3: 2016-06-01
    Type: Data collection
  • Version 1.4: 2017-09-20
    Type: Author supporting evidence, Derived calculations