3BDN

Crystal Structure of the Lambda Repressor


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.91 Å
  • R-Value Free: 0.374 
  • R-Value Work: 0.292 
  • R-Value Observed: 0.296 

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This is version 1.2 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
  • Primary Citation of Related Structures:  
    3BDN

  • 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 conditions ...

    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

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Lambda RepressorC [auth A],
D [auth B]
236Escherichia virus LambdaMutation(s): 1 
Gene Names: cIlambdap88
UniProt
Find proteins for P03034 (Escherichia phage lambda)
Explore P03034 
Go to UniProtKB:  P03034
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03034
Protein Feature View
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  • Reference Sequence

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Entity ID: 1
MoleculeChainsLengthOrganismImage
DNA (5'-D(*DAP*DAP*DTP*DAP*DCP*DCP*DAP*DCP*DTP*DGP*DGP*DCP*DGP*DGP*DTP*DGP*DAP*DTP*DAP*DT)-3')A [auth C]20N/A
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsLengthOrganismImage
DNA (5'-D(*DTP*DAP*DTP*DAP*DTP*DCP*DAP*DCP*DCP*DGP*DCP*DCP*DAP*DGP*DTP*DGP*DGP*DTP*DAP*DT)-3')B [auth D]20N/A
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.91 Å
  • R-Value Free: 0.374 
  • R-Value Work: 0.292 
  • R-Value Observed: 0.296 
  • Space Group: C 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 74.431α = 90
b = 161.099β = 90
c = 135.256γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
MLPHAREphasing
REFMACrefinement
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-04-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2021-10-20
    Changes: Database references