1MST

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Work: 0.218 
  • R-Value Observed: 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:  
    1MST, 1BMS

  • 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 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 ...

    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 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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BACTERIOPHAGE MS2 CAPSIDA, B, C129Escherichia phage MS2Mutation(s): 1 
UniProt
Find proteins for P03612 (Escherichia phage MS2)
Explore P03612 
Go to UniProtKB:  P03612
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Work: 0.218 
  • R-Value Observed: 0.218 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 288α = 90
b = 288β = 90
c = 653γ = 120
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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