1RHB

WATER DEPENDENT DOMAIN MOTION AND FLEXIBILITY IN RIBONUCLEASE A AND THE INVARIANT FEATURES IN ITS HYDRATION SHELL. AN X-RAY STUDY OF TWO LOW HUMIDITY CRYSTAL FORMS OF THE ENZYME


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Observed: 0.173 

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This is version 1.2 of the entry. See complete history


Literature

Water-dependent domain motion and flexibility in ribonuclease A and the invariant features in its hydration shell. An X-ray study of two low-humidity crystal forms of the enzyme.

Kishan, R.V.Chandra, N.R.Sudarsanakumar, C.Suguna, K.Vijayan, M.

(1995) Acta Crystallogr D Biol Crystallogr 51: 703-710

  • DOI: 10.1107/S0907444994014794
  • Primary Citation of Related Structures:  
    1RHB, 1RHA

  • PubMed Abstract: 
  • The crystal structures of 88 and 79% relative humidity forms of ribonuclease A, resulting from water-mediated transformations, have been refined employing the restrained least-squares method using X-ray data collected on an area detector to R = 0.173 for 15 326 observed reflections in the 10-1 ...

    The crystal structures of 88 and 79% relative humidity forms of ribonuclease A, resulting from water-mediated transformations, have been refined employing the restrained least-squares method using X-ray data collected on an area detector to R = 0.173 for 15 326 observed reflections in the 10-1.5 A resolution shell and R = 0.176 for 8534 observed reflections in the 10-1.8 A shell, respectively. The comparison of these structures with those of the native, the phosphate-bound and the sulfate-bound forms demonstrates that the mobility of the ribonuclease A molecule involves hinge-bending movement of the two domains and local flexibility within them, particularly at the termini of regular secondary structures and in loops. The comparison also leads to the identification of 31 invariant water molecules in the hydration shell of the enzyme, many of which are involved in holding different parts of the molecule together and in stabilizing local structure. The conformational changes that accompany the partial removal of the surrounding water, particularly those observed in the 79% form, could be similar to those that occur during enzyme action.


    Related Citations: 
    • Protein Hydration and Water Structure: X-Ray Analysis of a Closely Packed Protein Crystal with Very Low Solvent Content
      Madhusudan, Kodandapani, R., Vijayan, M.
      (1993) Acta Crystallogr D Biol Crystallogr 49: 234
    • Rigid and Flexible Regions in Lysozyme and the Invariant Features in its Hydration Shell
      Madhusudan, Vijayan, M.
      (1991) Curr Sci 60: 165
    • Crystal Structure of Low Humidity Tetragonal Lysozyme at at 2.1 Angstroms Resolution; Variability in Hydration Shell and its Structural Consequences
      Kodandapani, R., Suresh, C.G., Vijayan, M.
      (1990) J Biol Chem 265: 16126
    • Water-Mediated Transformations in Protein Crystals
      Salunke, D.M., Veerapandian, B., Kodandapani, R., Vijayan, M.
      (1985) Acta Crystallogr B 41: 431
    • Water-Mediated Structural Transformations in a New Crystal Form of Ribonuclease A and Tetragonal Lysozyme
      Salunke, D.M., Veerapandian, B., Vijayan, M.
      (1984) Curr Sci 53: 231

    Organizational Affiliation

    Molecular Biophysics Unit, Indian Institute of Science, Bangalore, India.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
RIBONUCLEASE AA124Bos taurusMutation(s): 0 
Gene Names: RNASE1RNS1
EC: 3.1.27.5 (PDB Primary Data), 4.6.1.18 (UniProt)
UniProt
Find proteins for P61823 (Bos taurus)
Explore P61823 
Go to UniProtKB:  P61823
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Observed: 0.173 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 29.74α = 90
b = 38.25β = 112.66
c = 52.4γ = 90
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1995-02-27
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance