Journal of Molecular Modeling

, Volume 17, Issue 1, pp 133–150

Binding Selectivity of RecA to a single stranded DNA, a computational approach

Original Paper


Homologous recombination (HR) is the major DNA double strand break repair pathway which maintains the genomic integrity. It is fundamental for the survivability and functionality of all organisms. One of the initial steps in HR is the formation of the nucleoprotein filament composed by a single stranded DNA chain surrounded by the recombinases protein. The filament orchestrates the search for an undamaged homologue, as a template for the repair process. Our theoretical study was aimed at elucidating the selectivity of the interaction between a monomer of the recombinases enzyme in the Escherichia coli, EcRecA, the bacterial homologue of human Rad51, with a series of oligonucleotides of nine bases length. The complex, equilibrated for 20 ns with Langevian dynamics, was inserted in a periodic box with a 8 Å buffer of water molecules explicitly described by the TIP3P model. The absolute binding free energies are calculated in an implicit solvent using the Poisson-Boltzmann (PB) and the generalized Born (GB) solvent accessible surface area, using the MM-PB(GB)SA model. The solute entropic contribution is also calculated by normal mode analysis. The results underline how a significant contribution of the binding free energy is due to the interaction with the Arg196, a critical amino acid for the activity of the enzyme. The study revealed how the binding affinity of EcRecA is significantly higher toward dT9 rather than dA9, as expected from the experimental results.


Binding EcRecA Homologous recombination MM-PBSA Molecular dynamics 


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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Universities Space Research AssociationHoustonUSA
  2. 2.NASA-JSC Space Radiation Health ProjectHoustonUSA

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