3BDN

Crystal Structure of the Lambda Repressor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.909 Å
  • R-Value Free: 0.374 
  • R-Value Work: 0.292 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal structure of the lambda repressor and a model for pairwise cooperative operator binding

Stayrook, S.E.Jaru-Ampornpan, P.Ni, J.Hochschild, A.Lewis, M.

(2008) Nature 452: 1022-1025

  • DOI: 10.1038/nature06831

  • PubMed Abstract: 
  • Bacteriophage lambda has for many years been a model system for understanding mechanisms of gene regulation. A 'genetic switch' enables the phage to transition from lysogenic growth to lytic development when triggered by specific environmental condit ...

    Bacteriophage lambda has for many years been a model system for understanding mechanisms of gene regulation. A 'genetic switch' enables the phage to transition from lysogenic growth to lytic development when triggered by specific environmental conditions. The key component of the switch is the cI repressor, which binds to two sets of three operator sites on the lambda chromosome that are separated by about 2,400 base pairs (bp). A hallmark of the lambda system is the pairwise cooperativity of repressor binding. In the absence of detailed structural information, it has been difficult to understand fully how repressor molecules establish the cooperativity complex. Here we present the X-ray crystal structure of the intact lambda cI repressor dimer bound to a DNA operator site. The structure of the repressor, determined by multiple isomorphous replacement methods, reveals an unusual overall architecture that allows it to adopt a conformation that appears to facilitate pairwise cooperative binding to adjacent operator sites.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, 37th and Hamilton Walk, Philadelphia, Pennsylvania 19102-6059, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Lambda Repressor
A, B
236Enterobacteria phage lambdaGene Names: cI
Find proteins for P03034 (Enterobacteria phage lambda)
Go to UniProtKB:  P03034
Entity ID: 1
MoleculeChainsLengthOrganism
DNA (5'-D(*DAP*DAP*DTP*DAP*DCP*DCP*DAP*DCP*DTP*DGP*DGP*DCP*DGP*DGP*DTP*DGP*DAP*DTP*DAP*DT)-3')C20N/A
Entity ID: 2
MoleculeChainsLengthOrganism
DNA (5'-D(*DTP*DAP*DTP*DAP*DTP*DCP*DAP*DCP*DCP*DGP*DCP*DCP*DAP*DGP*DTP*DGP*DGP*DTP*DAP*DT)-3')D20N/A
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.909 Å
  • R-Value Free: 0.374 
  • R-Value Work: 0.292 
  • Space Group: C 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 74.431α = 90.00
b = 161.099β = 90.00
c = 135.256γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
REFMACrefinement
DENZOdata reduction
CBASSdata collection
MLPHAREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-04-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance