Biological Assembly 1  

 3D View: Structure

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 21.86 kDa 
• Atom Count: 1653 
• Modelled Residue Count: 202 
• Deposited Residue Count: 202 
• Unique protein chains: 1

1F39

CRYSTAL STRUCTURE OF THE LAMBDA REPRESSOR C-TERMINAL DOMAIN

• DOI: 10.2210/pdb1F39/pdb

• Classification: VIRAL PROTEIN
• Organism(s): Escherichia virus Lambda
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2000-06-01 Released: 2000-07-26 
• Deposition Author(s): Bell, C.E., Frescura, P., Hochschild, A., Lewis, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.257 
• R-Value Work: 0.228 
• R-Value Observed: 0.228 

Literature

Crystal structure of the lambda repressor C-terminal domain provides a model for cooperative operator binding.

Bell, C.E., Frescura, P., Hochschild, A., Lewis, M.

(2000) Cell 101: 801-811

• PubMed: 10892750 
• DOI: 10.1016/s0092-8674(00)80891-0
• Primary Citation of Related Structures:  
  1F39


• PubMed Abstract: 
  

Interactions between transcription factors bound to separate operator sites commonly play an important role in gene regulation by mediating cooperative binding to the DNA. However, few detailed structural models for understanding the molecular basis of such cooperativity are available. The c1 repressor of bacteriophage lambda is a classic example of a protein that binds to its operator sites cooperatively. The C-terminal domain of the repressor mediates dimerization as well as a dimer-dimer interaction that results in the cooperative binding of two repressor dimers to adjacent operator sites. Here, we present the x-ray crystal structure of the lambda repressor C-terminal domain determined by multiwavelength anomalous diffraction. Remarkably, the interactions that mediate cooperativity are captured in the crystal, where two dimers associate about a 2-fold axis of symmetry. Based on the structure and previous genetic and biochemical data, we present a model for the cooperative binding of two lambda repressor dimers at adjacent operator sites.

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Organizational Affiliation: 

The Johnson Foundation and Department of Biochemistry and Biophysics, University of Pennsylvania School of Medicine, Philadelphia 19104, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
REPRESSOR PROTEIN CI	A, B	101	Escherichia virus Lambda	Mutation(s): 0  Gene Names: cI, lambdap88
Find proteins for P03034 (Escherichia phage lambda) Explore P03034  Go to UniProtKB:  P03034

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.257 
• R-Value Work: 0.228 
• R-Value Observed: 0.228 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 46.014	α = 90
b = 101.335	β = 90
c = 114.32	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
SOLVE	phasing
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-06-01 
• Released Date: 2000-07-26 
Deposition Author(s): Bell, C.E., Frescura, P., Hochschild, A., Lewis, M.

Revision History  

• Version 1.0: 2000-07-26
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance