2UV1

Hexagonal crystal form of GamS from bacteriophage lambda.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.235 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

The Crystal Structure of Lambda-Gam Protein Suggests a Model for Recbcd Inhibition.

Court, R.I.Cook, N.Saikrishnan, K.Wigley, D.B.

(2007) J.Mol.Biol. 371: 25

  • DOI: 10.1016/j.jmb.2007.05.037
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • In Escherichia coli, RecBCD processes double-stranded DNA breaks during the initial stages of homologous recombination. RecBCD contains helicase and nuclease activities, and unwinds and digests the blunt-ended DNA until a specific eight-nucleotide se ...

    In Escherichia coli, RecBCD processes double-stranded DNA breaks during the initial stages of homologous recombination. RecBCD contains helicase and nuclease activities, and unwinds and digests the blunt-ended DNA until a specific eight-nucleotide sequence, Chi, is encountered. Chi modulates the nuclease activity of RecBCD and results in a resected DNA end, which is a substrate for RecA during subsequent steps in recombination. RecBCD also acts as a defence mechanism against bacteriophage infection by digesting linear viral DNA present during virus replication or resulting from the action of restriction endonucleases. To avoid this fate, bacteriophage lambda encodes the gene Gam whose product is an inhibitor of RecBCD. Gam has been shown to bind to RecBCD and inhibit its helicase and nuclease activities. We show that Gam inhibits RecBCD by preventing it from binding DNA. We have solved the crystal structure of Gam from two different crystal forms. Using the published crystal structure of RecBCD in complex with DNA we suggest models for the molecular mechanism of Gam-mediated inhibition of RecBCD. We also propose that Gam could be a mimetic of single-stranded, and perhaps also double-stranded, DNA.


    Organizational Affiliation

    Cancer Research UK Clare Hall Laboratories, Blanche Lane, South Mimms, Hertfordshire EN6 3LD, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HOST-NUCLEASE INHIBITOR PROTEIN GAM
A, B
99Escherichia phage lambdaMutation(s): 0 
Gene Names: gam (gamma)
Find proteins for P03702 (Escherichia phage lambda)
Go to UniProtKB:  P03702
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.300 
  • R-Value Work: 0.235 
  • Space Group: P 6 2 2
Unit Cell:
Length (Å)Angle (°)
a = 84.479α = 90.00
b = 84.479β = 90.00
c = 105.260γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-06-12
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance