1AQ4

STRUCTURE OF A MS2 COAT PROTEIN MUTANT IN COMPLEX WITH AN RNA OPERATOR


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Work: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Crystal structures of MS2 coat protein mutants in complex with wild-type RNA operator fragments.

van den Worm, S.H.Stonehouse, N.J.Valegard, K.Murray, J.B.Walton, C.Fridborg, K.Stockley, P.G.Liljas, L.

(1998) Nucleic Acids Res. 26: 1345-1351

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • In MS2 assembly of phage particles results from an interaction between a coat protein dimer and a stem-loop of the RNA genome (the operator hairpin). Amino acid residues Thr45, which is universally conserved among the small RNA phages, and Thr59 are ...

    In MS2 assembly of phage particles results from an interaction between a coat protein dimer and a stem-loop of the RNA genome (the operator hairpin). Amino acid residues Thr45, which is universally conserved among the small RNA phages, and Thr59 are part of the specific RNA binding pocket and interact directly with the RNA; the former through a hydrogen bond, the latter through hydrophobic contacts. The crystal structures of MS2 protein capsids formed by mutants Thr45Ala and Thr59Ser, both with and without the 19 nt wild-type operator hairpin bound, are reported here. The RNA hairpin binds to these mutants in a similar way to its binding to wild-type protein. In a companion paper both mutants are shown to be deficient in RNA binding in an in vivo assay, but in vitro the equilibrium dissociation constant is significantly higher than wild-type for the Thr45Ala mutant. The change in binding affinity of the Thr45Ala mutant is probably a direct consequence of removal of direct hydrogen bonds between the protein and the RNA. The properties of the Thr59Ser mutant are more difficult to explain, but are consistent with a loss of non-polar contact.


    Organizational Affiliation

    Department of Molecular Biology, Uppsala University, Box 590, S-751 24 Uppsala, Sweden and Department of Biology, University of Leeds, Leeds LS2 9JT, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PROTEIN(BACTERIOPHAGE MS2 COAT PROTEIN)
A, B, C
129Escherichia phage MS2Mutation(s): 1 
Find proteins for P03612 (Escherichia phage MS2)
Go to UniProtKB:  P03612
Entity ID: 1
MoleculeChainsLengthOrganism
RNA (5'-R(*AP*CP*AP*UP*GP*AP*GP*GP*AP*UP*UP*AP*CP*CP*CP*AP*U P*GP*U)-3')R,S19Enterobacterio phage MS2
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Work: 0.197 
  • Space Group: H 3 2
Unit Cell:
Length (Å)Angle (°)
a = 288.000α = 90.00
b = 288.000β = 90.00
c = 653.000γ = 120.00
Software Package:
Software NamePurpose
ROTAVATAdata scaling
Agrovatadata scaling
DENZOdata reduction
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-12-24
    Type: Initial release
  • Version 1.1: 2008-05-22
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-02-08
    Type: Structure summary