1MST

CRYSTAL STRUCTURE OF MS2 CAPSIDS WITH MUTATIONS IN THE SUBUNIT FG LOOP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Work: 0.218 

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This is version 1.2 of the entry. See complete history

Literature

Crystal structures of MS2 capsids with mutations in the subunit FG loop.

Stonehouse, N.J.Valegard, K.Golmohammadi, R.van den Worm, S.Walton, C.Stockley, P.G.Liljas, L.

(1996) J.Mol.Biol. 256: 330-339

  • DOI: 10.1006/jmbi.1996.0089
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The loop between the F and G beta strands (FG loop) of the bacteriophage MS2 coat protein subunit forms inter-subunit contacts around the 5-fold and 3-fold (quasi 6-fold) axes of the T=3 protein shell. In capsids, the loop is found in two very differ ...

    The loop between the F and G beta strands (FG loop) of the bacteriophage MS2 coat protein subunit forms inter-subunit contacts around the 5-fold and 3-fold (quasi 6-fold) axes of the T=3 protein shell. In capsids, the loop is found in two very different conformations, one in B subunits, which form the 5-fold contact, and one in A and C subunits, which form the quasi 6-fold contact. One proline residue, Pro78, is strictly conserved in the coat protein of all related bacteriophages, and in the case of MS2 this proline residue is preceded by a cis peptide bond in the B subunit. In order to probe the role of the FG loop in capsid assembly, we have determined the crystal structures of two MS2 capsids, formed by coat proteins with mutations at two positions in the FG loop, P78N or E76D. These mutants show conformational changes in the FG loops that explain the reduced temperature stability of the capsids. The P78N mutant has a normal trans peptide bond at position 78.


    Related Citations: 
    • 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
    • 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


    Organizational Affiliation

    Department of Genetics, University of Leeds, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Work: 0.218 
  • 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-PLORrefinement
X-PLORphasing
X-PLORmodel building
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-03-08
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance