4PEQ

Structure of bovine ribonuclease inhibitor complexed with bovine ribonuclease I


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.211 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.176 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Functional evolution of ribonuclease inhibitor: insights from birds and reptiles.

Lomax, J.E.Bianchetti, C.M.Chang, A.Phillips, G.N.Fox, B.G.Raines, R.T.

(2014) J.Mol.Biol. 426: 3041-3056

  • DOI: 10.1016/j.jmb.2014.06.007
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Ribonuclease inhibitor (RI) is a conserved protein of the mammalian cytosol. RI binds with high affinity to diverse secretory ribonucleases (RNases) and inhibits their enzymatic activity. Although secretory RNases are found in all vertebrates, the ex ...

    Ribonuclease inhibitor (RI) is a conserved protein of the mammalian cytosol. RI binds with high affinity to diverse secretory ribonucleases (RNases) and inhibits their enzymatic activity. Although secretory RNases are found in all vertebrates, the existence of a non-mammalian RI has been uncertain. Here, we report on the identification and characterization of RI homologs from chicken and anole lizard. These proteins bind to RNases from multiple species but exhibit much greater affinity for their cognate RNases than for mammalian RNases. To reveal the basis for this differential affinity, we determined the crystal structure of mouse, bovine, and chicken RI·RNase complexes to a resolution of 2.20, 2.21, and 1.92Å, respectively. A combination of structural, computational, and bioinformatic analyses enabled the identification of two residues that appear to contribute to the differential affinity for RNases. We also found marked differences in oxidative instability between mammalian and non-mammalian RIs, indicating evolution toward greater oxygen sensitivity in RIs from mammalian species. Taken together, our results illuminate the structural and functional evolution of RI, along with its dynamic role in vertebrate biology.


    Organizational Affiliation

    Graduate Program in Cellular and Molecular Biology, University of Wisconsin-Madison, Madison, WI 53706, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ribonuclease pancreatic
A, C
124Bos taurusMutation(s): 0 
Gene Names: RNASE1 (RNS1)
EC: 3.1.27.5
Find proteins for P61823 (Bos taurus)
Go to Gene View: RNASE1
Go to UniProtKB:  P61823
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Ribonuclease/angiogenin inhibitor 1
B, D
456Bos taurusMutation(s): 0 
Gene Names: RNH1
Find proteins for Q3SZN8 (Bos taurus)
Go to Gene View: RNH1
Go to UniProtKB:  Q3SZN8
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.211 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.176 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 117.792α = 90.00
b = 123.550β = 90.00
c = 179.301γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-06-25
    Type: Initial release
  • Version 1.1: 2014-07-02
    Type: Database references
  • Version 1.2: 2014-09-24
    Type: Structure summary
  • Version 1.3: 2014-10-01
    Type: Database references
  • Version 1.4: 2017-11-22
    Type: Database references, Derived calculations, Other, Refinement description, Source and taxonomy