6Z9L

Enterococcal PrgA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.06 Å
  • R-Value Free: 0.318 
  • R-Value Work: 0.286 
  • R-Value Observed: 0.288 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Enterococcal PrgA Extends Far Outside the Cell and Provides Surface Exclusion to Protect against Unwanted Conjugation.

Schmitt, A.Hirt, H.Jarva, M.A.Sun, W.S.Ter Beek, J.Dunny, G.M.Berntsson, R.P.

(2020) J Mol Biol 432: 5681-5695

  • DOI: 10.1016/j.jmb.2020.08.018
  • Primary Citation of Related Structures:  
    6Z9K, 6Z9L

  • PubMed Abstract: 
  • Horizontal gene transfer between Gram-positive bacteria leads to a rapid spread of virulence factors and antibiotic resistance. This transfer is often facilitated via type 4 secretion systems (T4SS), which frequently are encoded on conjugative plasmids. However, donor cells that already contain a particular conjugative plasmid resist acquisition of a second copy of said plasmid ...

    Horizontal gene transfer between Gram-positive bacteria leads to a rapid spread of virulence factors and antibiotic resistance. This transfer is often facilitated via type 4 secretion systems (T4SS), which frequently are encoded on conjugative plasmids. However, donor cells that already contain a particular conjugative plasmid resist acquisition of a second copy of said plasmid. They utilize different mechanisms, including surface exclusion for this purpose. Enterococcus faecalis PrgA, encoded by the conjugative plasmid pCF10, is a surface protein that has been implicated to play a role in both virulence and surface exclusion, but the mechanism by which this is achieved has not been fully explained. Here, we report the structure of full-length PrgA, which shows that PrgA protrudes far out from the cell wall (approximately 40 nm), where it presents a protease domain. In vivo experiments show that PrgA provides a physical barrier to cellular adhesion, thereby reducing cellular aggregation. This function of PrgA contributes to surface exclusion, reducing the uptake of its cognate plasmid by approximately one order of magnitude. Using variants of PrgA with mutations in the catalytic site we show that the surface exclusion effect is dependent on the activity of the protease domain of PrgA. In silico analysis suggests that PrgA can interact with another enterococcal adhesin, PrgB, and that these two proteins have co-evolved. PrgB is a strong virulence factor, and PrgA is involved in post-translational processing of PrgB. Finally, competition mating experiments show that PrgA provides a significant fitness advantage to plasmid-carrying cells.


    Organizational Affiliation

    Department of Medical Biochemistry and Biophysics, Umeå University, SE-90187 Umeå, Sweden; Wallenberg Centre for Molecular Medicine, Umeå University, Umeå, Sweden. Electronic address: ronnie.berntsson@umu.se.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PrgAA787Enterococcus faecalisMutation(s): 0 
Gene Names: prgA
UniProt
Find proteins for Q04111 (Enterococcus faecalis)
Explore Q04111 
Go to UniProtKB:  Q04111
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ04111
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Poly-alanine peptideB [auth F],
C [auth G]
9Escherichia coliMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.06 Å
  • R-Value Free: 0.318 
  • R-Value Work: 0.286 
  • R-Value Observed: 0.288 
  • Space Group: P 43 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 126.356α = 90
b = 126.356β = 90
c = 293.908γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata reduction
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Swedish Research CouncilSweden2016-03599
Other privateSwedenJCK-1524
Other privateSwedenSMK-1869

Revision History  (Full details and data files)

  • Version 1.0: 2020-09-16
    Type: Initial release
  • Version 1.1: 2020-10-14
    Changes: Database references