2OG0

Crystal Structure of the Lambda Xis-DNA complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Fis targets assembly of the xis nucleoprotein filament to promote excisive recombination by phage lambda.

Papagiannis, C.V.Sam, M.D.Abbani, M.A.Yoo, D.Cascio, D.Clubb, R.T.Johnson, R.C.

(2007) J.Mol.Biol. 367: 328-343

  • DOI: 10.1016/j.jmb.2006.12.071

  • PubMed Abstract: 
  • The phage-encoded Xis protein is the major determinant controlling the direction of recombination in phage lambda. Xis is a winged-helix DNA binding protein that cooperatively binds to the attR recombination site to generate a curved microfilament, w ...

    The phage-encoded Xis protein is the major determinant controlling the direction of recombination in phage lambda. Xis is a winged-helix DNA binding protein that cooperatively binds to the attR recombination site to generate a curved microfilament, which promotes assembly of the excisive intasome but inhibits formation of an integrative intasome. We find that lambda synthesizes surprisingly high levels of Xis immediately upon prophage induction when excision rates are maximal. However, because of its low sequence-specific binding activity, exemplified by a 1.9 A co-crystal structure of a non-specifically bound DNA complex, Xis is relatively ineffective at promoting excision in vivo in the absence of the host Fis protein. Fis binds to a segment in attR that almost entirely overlaps one of the Xis binding sites. Instead of sterically excluding Xis binding from this site, as has been previously believed, we show that Fis enhances binding of all three Xis protomers to generate the microfilament. A specific Fis-Xis interface is supported by the effects of mutations within each protein, and relaxed, but not completely sequence-neutral, binding by the central Xis protomer is supported by the effects of DNA mutations. We present a structural model for the 50 bp curved Fis-Xis cooperative complex that is assembled between the arm and core Int binding sites whose trajectory places constraints on models for the excisive intasome structure.


    Organizational Affiliation

    Department of Biological Chemistry, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1737, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Excisionase
A, B
52Escherichia phage lambdaMutation(s): 1 
Gene Names: xis
Find proteins for P03699 (Escherichia phage lambda)
Go to UniProtKB:  P03699
Entity ID: 1
MoleculeChainsLengthOrganism
5'-D(*GP*TP*AP*TP*TP*AP*TP*GP*TP*AP*GP*TP*CP*TP*GP*TP*TP*T)-3'C18N/A
Entity ID: 2
MoleculeChainsLengthOrganism
5'-D(*AP*AP*AP*CP*AP*GP*AP*CP*TP*AP*CP*AP*TP*AP*AP*TP*AP*C)-3'D18N/A
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.248 
  • R-Value Work: 0.191 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 57.483α = 90.00
b = 57.483β = 90.00
c = 163.613γ = 120.00
Software Package:
Software NamePurpose
CrystalCleardata collection
EPMRphasing
DENZOdata reduction
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-03-13
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.3: 2017-10-18
    Type: Refinement description
  • Version 1.4: 2018-04-04
    Type: Data collection