1FR5

PHAGE FR CAPSIDS WITH A FOUR RESIDUE DELETION IN THE COAT PROTEIN FG LOOP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Work: 0.256 
  • R-Value Observed: 0.256 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure of phage fr capsids with a deletion in the FG loop: implications for viral assembly.

Axblom, C.Tars, K.Fridborg, K.Orna, L.Bundule, M.Liljas, L.

(1998) Virology 249: 80-88

  • DOI: 10.1006/viro.1998.9279
  • Primary Citation of Related Structures:  
    1FR5

  • PubMed Abstract: 
  • The loop between beta-strands F and G in the coat protein of small RNA bacteriophages forms the interactions at the fivefold and threefold (quasi-sixfold) icosahedral axes. In many cases, mutations in this region renders the coat protein unable to form capsids ...

    The loop between beta-strands F and G in the coat protein of small RNA bacteriophages forms the interactions at the fivefold and threefold (quasi-sixfold) icosahedral axes. In many cases, mutations in this region renders the coat protein unable to form capsids. This FG loop has therefore been suggested to be of major importance for the virus assembly process by guiding the assembly and helping to define the correct curvature of the virus shell. We have determined the crystal structure of a phage fr capsid where the coat protein has a four-residue deletion in the FG loop. This mutant retains the ability to form virus capsids of normal size but has a significantly lower temperature stability than the wild type. The structure reveals that the mutated loops are flexible and too short to interact with each other. This seems incompatible with a role of the FG loop in the regulation of capsid size.


    Related Citations: 
    • Crystal Structure of Bacteriophage Fr Capsids at 3.5 A Resolution
      Liljas, L., Fridborg, K., Valegard, K., Bundule, M., Pumpens, P.
      (1994) J Mol Biol 244: 279

    Organizational Affiliation

    Department of Molecular Biology, Uppsala University, Uppsala, S-751 24, Sweden.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BACTERIOPHAGE FR CAPSIDA, B, C125Enterobacteria phage frMutation(s): 0 
UniProt
Find proteins for P03614 (Enterobacteria phage fr)
Explore P03614 
Go to UniProtKB:  P03614
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03614
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Work: 0.256 
  • R-Value Observed: 0.256 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 264.1α = 90
b = 264.1β = 90
c = 654.2γ = 120
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-01-13
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance