5YVQ

Complex of Mu phage tail fiber and its chaperone

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.238 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

Phage tail fibre assembly proteins employ a modular structure to drive the correct folding of diverse fibres.

North, O.I., Sakai, K., Yamashita, E., Nakagawa, A., Iwazaki, T., Buttner, C.R., Takeda, S., Davidson, A.R.

(2019) Nat Microbiol 4: 1645-1653

  • DOI: 10.1038/s41564-019-0477-7
  • Primary Citation of Related Structures:  
    5YVQ

  • PubMed Abstract: 

    • Phage tail fibres are elongated protein assemblies capable of specific recognition of bacterial surfaces during the first step of viral infection 1-4 . The folding of these complex trimeric structures often requires a phage-encoded tail fibre assembly (Tfa) protein 5-7 ...

    Phage tail fibres are elongated protein assemblies capable of specific recognition of bacterial surfaces during the first step of viral infection 1-4 . The folding of these complex trimeric structures often requires a phage-encoded tail fibre assembly (Tfa) protein 5-7 . Despite the wide occurrence of Tfa proteins, their functional mechanism has not been elucidated. Here, we investigate the tail fibre and Tfa of Escherichia coli phage Mu. We demonstrate that Tfa forms a stable complex with the tail fibre, and present a 2.1 Å resolution X-ray crystal structure of this complex. We find that Tfa proteins are comprised of two domains: a non-conserved N-terminal domain that binds to the C-terminal region of the fibre and a conserved C-terminal domain that probably mediates fibre oligomerization and assembly. Tfa forms rapidly exchanging multimers on its own, but not a stable trimer, implying that Tfa does not specify the trimeric state of the fibre. We propose that the key conserved role of Tfa is to ensure that fibre assembly and multimerization initiates at the C terminus, ensuring that the intertwined and repetitive structural elements of fibres come together in the correct sequence. The universal importance of correctly aligning the C termini of phage fibres is highlighted by our work.

    Organizational Affiliation: 

    Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada. alan.davidson@utoronto.ca.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Tail fiber protein S A504Escherichia virus MuMutation(s): 0 
Gene Names: S, Mup49
Find proteins for Q9T1V0 (Escherichia phage Mu)
Explore Q9T1V0 
Go to UniProtKB:  Q9T1V0
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Tail fiber assembly protein U B175Escherichia virus MuMutation(s): 0 
Gene Names: U, Mup50
Find proteins for Q9T1U9 (Escherichia phage Mu)
Explore Q9T1U9 
Go to UniProtKB:  Q9T1U9
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.238 
  • Space Group: P 3 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.332α = 90
b = 66.332β = 90
c = 387.769γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
SHARPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-05-22
    Type: Initial release
  • Version 1.1: 2019-10-09
    Changes: Data collection, Database references