6TRI

CI-MOR repressor-antirepressor complex of the temperate bacteriophage TP901-1 from Lactococcus lactis


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.28 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.190 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Revealing the mechanism of repressor inactivation during switching of a temperate bacteriophage.

Rasmussen, K.K.Palencia, A.Varming, A.K.El-Wali, H.Boeri Erba, E.Blackledge, M.Hammer, K.Herrmann, T.Kilstrup, M.Lo Leggio, L.Jensen, M.R.

(2020) Proc Natl Acad Sci U S A 117: 20576-20585

  • DOI: 10.1073/pnas.2005218117
  • Primary Citation of Related Structures:  
    6TO6, 6TRI

  • PubMed Abstract: 
  • Temperate bacteriophages can enter one of two life cycles following infection of a sensitive host: the lysogenic or the lytic life cycle. The choice between the two alternative life cycles is dependent upon a tight regulation of promoters and their c ...

    Temperate bacteriophages can enter one of two life cycles following infection of a sensitive host: the lysogenic or the lytic life cycle. The choice between the two alternative life cycles is dependent upon a tight regulation of promoters and their cognate regulatory proteins within the phage genome. We investigated the genetic switch of TP901-1, a bacteriophage of Lactococcus lactis , controlled by the CI repressor and the modulator of repression (MOR) antirepressor and their interactions with DNA. We determined the solution structure of MOR, and we solved the crystal structure of MOR in complex with the N-terminal domain of CI, revealing the structural basis of MOR inhibition of CI binding to the DNA operator sites. 15 N NMR Carr-Purcell-Meiboom-Gill (CPMG) relaxation dispersion and rotating frame R measurements demonstrate that MOR displays molecular recognition dynamics on two different time scales involving a repacking of aromatic residues at the interface with CI. Mutations in the CI:MOR binding interface impair complex formation in vitro, and when introduced in vivo, the bacteriophage switch is unable to choose the lytic life cycle showing that the CI:MOR complex is essential for proper functioning of the genetic switch. On the basis of sequence alignments, we show that the structural features of the MOR:CI complex are likely conserved among a larger family of bacteriophages from human pathogens implicated in transfer of antibiotic resistance.


    Organizational Affiliation

    Université Grenoble Alpes, Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), Centre National de la Recherche Scientifique (CNRS), Institut de Biologie Structurale, F-38000 Grenoble, France leila@chem.ku.dk malene.ringkjobing-jensen@ibs.fr.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CIA95Lactococcus phage TP901-1Mutation(s): 0 
Gene Names: cI
Find proteins for O48503 (Lactococcus phage TP901-1)
Explore O48503 
Go to UniProtKB:  O48503
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
MORB74Lactococcus phage TP901-1Mutation(s): 0 
Gene Names: mor
Find proteins for O48504 (Lactococcus phage TP901-1)
Explore O48504 
Go to UniProtKB:  O48504
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.28 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.190 
  • Space Group: P 3 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 94.405α = 90
b = 94.405β = 90
c = 30.558γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
XSCALEdata scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Danish Council for Independent ResearchDenmark4002-00107

Revision History 

  • Version 1.0: 2020-08-19
    Type: Initial release
  • Version 1.1: 2020-08-26
    Changes: Database references
  • Version 1.2: 2020-09-02
    Changes: Database references