1PY3

Crystal structure of Ribonuclease Sa2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.172 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal structure reveals two alternative conformations in the active site of ribonuclease Sa2.

Sevcik, J.Dauter, Z.Wilson, K.S.

(2004) Acta Crystallogr.,Sect.D 60: 1198-1204

  • DOI: 10.1107/S0907444904009035
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Three different strains of Streptomyces aureofaciens produce the homologous ribonucleases Sa, Sa2 and Sa3. The crystal structures of ribonuclease Sa (RNase Sa) and its complexes with mononucleotides have previously been reported at high resolution. H ...

    Three different strains of Streptomyces aureofaciens produce the homologous ribonucleases Sa, Sa2 and Sa3. The crystal structures of ribonuclease Sa (RNase Sa) and its complexes with mononucleotides have previously been reported at high resolution. Here, the structures of two crystal forms (I and II) of ribonuclease Sa2 (RNase Sa2) are presented at 1.8 and 1.5 A resolution. The structures were determined by molecular replacement using the coordinates of RNase Sa as a search model and were refined to R factors of 17.5 and 15.0% and R(free) factors of 21.8 and 17.2%, respectively. The asymmetric unit of crystal form I contains three enzyme molecules, two of which have similar structures to those seen for ribonuclease Sa, with Tyr87 at the bottom of their active sites. In the third molecule, Tyr87 has moved substantially: the CA atom moves almost 5 A and the OH of the side chain moves 10 A, inserting itself into the active site of a neighbouring molecule at a similar position to that observed for the nucleotide base in RNase Sa complexes. The asymmetric unit of crystal form II contains two Sa2 molecules, both of which are similar to the usual Sa structures. In one molecule, two main-chain conformations were modelled in the alpha-helix. Finally, a brief comparison is made between the conformations of the Sa2 molecules and those of 34 independent molecules taken from 20 structures of ribonuclease Sa and two independent molecules taken from two structures of ribonuclease Sa3 in various crystal forms.


    Related Citations: 
    • Purification of Ribonucleases Sa, Sa2 and Sa3 after Expression in Escherichia coli
      Hebert, E.J.,Grimsley, G.R.,Hartley, R.W.,Horn, G.,Schell, D.,Garcia, S.,Both, V.,Sevcik, J.,Pace, C.N.
      (1997) Protein Expr.Purif. 11: 162


    Organizational Affiliation

    Institute of Molecular Biology, Member of the Centre of Excellence for Molecular Medicine, Slovak Academy of Sciences, Dubravska Cesta 21, 84551 Bratislava, Slovak Republic. jozef.sevcik@savba.sk




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ribonuclease
A, B, C
97Kitasatospora aureofaciensMutation(s): 0 
Gene Names: ribonuclease
EC: 3.1.4.8
Find proteins for Q53752 (Kitasatospora aureofaciens)
Go to UniProtKB:  Q53752
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.172 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 102.290α = 90.00
b = 68.700β = 100.40
c = 57.510γ = 90.00
Software Package:
Software NamePurpose
MOLREPphasing
SCALEPACKdata scaling
REFMACrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-07-13
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2012-07-25
    Type: Other