5MNT

Bacteriophage Qbeta maturation protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.32 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.231 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Crystal Structure of the Maturation Protein from Bacteriophage Q beta.

Rumnieks, J.Tars, K.

(2017) J Mol Biol 429: 688-696

  • DOI: 10.1016/j.jmb.2017.01.012
  • Primary Citation of Related Structures:  
    5MNT

  • PubMed Abstract: 
  • Virions of the single-stranded RNA bacteriophages contain a single copy of the maturation protein, which is bound to the phage genome and is required for the infectivity of the particles. The maturation protein mediates the adsorption of the virion to bacterial pili and the subsequent release and penetration of the genome into the host cell ...

    Virions of the single-stranded RNA bacteriophages contain a single copy of the maturation protein, which is bound to the phage genome and is required for the infectivity of the particles. The maturation protein mediates the adsorption of the virion to bacterial pili and the subsequent release and penetration of the genome into the host cell. Here, we report a crystal structure of the maturation protein from bacteriophage Qβ. The protein has a bent, highly asymmetric shape and spans 110Å in length. Apart from small local substructures, the overall fold of the maturation protein does not resemble that of other known proteins. The protein is organized in two distinct regions, an α-helical part with a four-helix core, and a β stranded part that contains a seven-stranded sheet in the central part and a five-stranded sheet at the tip of the protein. The Qβ maturation protein has two distinct, positively charged areas at opposite sides of the α-helical part, which are involved in genomic RNA binding. The maturation protein binds to each of the surrounding coat protein dimers in the capsid differently, and the interaction is considerably weaker compared to coat protein interdimer contacts. The coat protein- or RNA-binding residues are not preserved among different ssRNA phage maturation proteins; instead, the distal end of the α-helical part is the most evolutionarily conserved, suggesting the importance of this region for maintaining the functionality of the protein.


    Organizational Affiliation

    Biomedical Research and Study Center, Ratsupites 1, LV1067 Riga, Latvia; Faculty of Biology, University of Latvia, Jelgavas 1, LV1004 Riga, Latvia. Electronic address: kaspars@biomed.lu.lv.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
A2 maturation proteinA, B, C, D421Escherichia virus QbetaMutation(s): 0 
UniProt
Find proteins for Q8LTE2 (Escherichia virus Qbeta)
Explore Q8LTE2 
Go to UniProtKB:  Q8LTE2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8LTE2
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.32 Å
  • R-Value Free: 0.279 
  • R-Value Work: 0.228 
  • R-Value Observed: 0.231 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 112.789α = 90
b = 232.515β = 90
c = 353.473γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling
SHELXDphasing

Structure Validation

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Entry History 

Deposition Data

  • Deposited Date: 2016-12-13 
  • Released Date: 2017-01-11 
  • Deposition Author(s): Rumnieks, J., Tars, K.

Revision History  (Full details and data files)

  • Version 1.0: 2017-01-11
    Type: Initial release
  • Version 1.1: 2017-02-01
    Changes: Database references
  • Version 1.2: 2017-03-08
    Changes: Database references
  • Version 1.3: 2018-01-17
    Changes: Data collection