AFM studies on the role of the protein RdgC in bacterial DNA recombination

  • Tessmer I
  • Moore T
  • Lloyd R
 et al. 
  • 5


    Mendeley users who have this article in their library.
  • N/A


    Citations of this article.


Genetic studies of rdgC in different bacterial systems suggest that it may play a role in replication and recombination. However, the exact function of the corresponding protein, RdgC, is unknown. In this study, we have imaged complexes of RdgC with both linear and supercoiled circular plasmid DNA using atomic force microscopy. We confirm that RdgC does not target any specific sequences in double-stranded DNA, as has been suggested from biochemical data. However, we detect an increased affinity of the protein to DNA ends, and an ability to promote bending of DNA. Similar binding preferences have been reported for enzymes involved in recombination. Protein complexes with supercoiled plasmid DNA further enabled us to study the effect of RdgC on DNA superstructure. At high concentrations of protein we observed promotion of DNA condensation. Recombination is largely enhanced by close contacts of distant regions along the DNA strands, as can occur, for instance, through condensation. Our data thus support a possible function of RdgC as a midwife of recombination.

Author-supplied keywords

  • *Microscopy
  • *Recombination
  • Atomic Force
  • Bacterial/chemistry/genetics/*metabolism/ultr
  • DNA
  • Escherichia coli Proteins/chemistry/*metabolism/*u
  • Genetic
  • Non-U.S. Gov't
  • Nucleic Acid Conformation
  • Plasmids/chemistry/genetics/metabolism/ultrastruct
  • Protein Structure
  • Quaternary
  • Research Support
  • Superhelical/chemistry/genetics/metabolism/ul

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in


  • I Tessmer

  • T Moore

  • R G Lloyd

  • A Wilson

  • D A Erie

  • S Allen

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free