2MS2

THE REFINED STRUCTURE OF BACTERIOPHAGE MS2 AT 2.8 ANGSTROMS RESOLUTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Work: 0.189 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The refined structure of bacteriophage MS2 at 2.8 A resolution.

Golmohammadi, R.Valegard, K.Fridborg, K.Liljas, L.

(1993) J.Mol.Biol. 234: 620-639

  • DOI: 10.1006/jmbi.1993.1616

  • PubMed Abstract: 
  • Bacteriophage MS2 is an icosahedral virus with 180 copies of a coat protein forming a shell around a single-stranded RNA molecule. The coat protein subunits form a lattice with the triangulation number T = 3. The coat protein has a fold which is diff ...

    Bacteriophage MS2 is an icosahedral virus with 180 copies of a coat protein forming a shell around a single-stranded RNA molecule. The coat protein subunits form a lattice with the triangulation number T = 3. The coat protein has a fold which is different from the fold of all other viral coat proteins so far known. It consists of a five-stranded beta sheet facing the inside of the particle, and a hairpin and two helices on the outside. The crystal structure has been refined at 2.8 A resolution. The final R-factor was 0.189 for reflections with F > 2 sigma, and the root-mean-square deviation from idealized bond lengths and bond angles was 0.015 A and 2.9 degrees, respectively. The three chemically identical conformers A, B and C are largely similar. The B conformer has a unique conformation in one loop, which is involved in 5-fold interactions, while the A and C conformers, which are involved in the quasi-6-fold contacts, are similar throughout the structure. One cis-proline has been identified in the B conformer but the corresponding prolines in A and C are of the trans isomer. This residue is conserved within small RNA coliphages and it is proposed that this isomerization enables a less elongated loop (FG) around the 5-fold axis, thus creating a channel. The extensive dimer contact supports the idea of dimers as initial building blocks. An assembly pathway is proposed where five dimers converge into a pentamer and 12 pentamers are linked together with free dimers creating a complete particle.


    Related Citations: 
    • The Structure of Bacteriophage MS2
      Liljas, L.,Valegard, K.
      (1990) Semin.Virol. 1: 467
    • Purification, Crystallization and Preliminary X-Ray Data of the Bacteriophage MS2
      Valegard, K.,Unge, T.,Montelius, I.,Strandberg, B.,Fiers, W.
      (1986) J.Mol.Biol. 190: 587
    • Structure Determination of the Bacteriophage MS2
      Valegard, K.,Liljas, L.,Fridborg, K.,Unge, T.
      (1991) Acta Crystallogr.,Sect.B 47: 949
    • The Three-Dimensional Structure of the Bacterial Virus MS2
      Valegard, K.,Liljas, L.,Fridborg, K.,Unge, T.
      (1990) Nature 345: 36


    Organizational Affiliation

    Department of Molecular Biology, Uppsala University Uppsala Biomedical Centre, Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BACTERIOPHAGE MS2 COAT PROTEIN
A, B, C
129Escherichia phage MS2Mutation(s): 0 
Find proteins for P03612 (Escherichia phage MS2)
Go to UniProtKB:  P03612
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Work: 0.189 
  • 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
X-PLORmodel building
X-PLORphasing
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 1994-08-23 
  • Released Date: 1995-01-26 
  • Deposition Author(s): Valegard, K., Liljas, L.
  • This entry supersedes: 1MS2

Revision History 

  • Version 1.0: 1995-01-26
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance