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© Institut Pasteur
Cells infected for 24 hrs with C. Trachomatis. The cell nuclei are labelled in blue, the bacteria appear yellow, within the inclusion lumen. A bacterial protein secreted out the inclusion into the host cytoplasm id labelled in red.
Publication : Molecular microbiology

Bacterial transformation: ComFA is a DNA-dependent ATPase that forms complexes with ComFC and DprA

Team: Structural Microbiology
Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Molecular microbiology - 28 Jul 2017

Diallo A, Foster HR, Gromek KA, Perry TN, Dujeancourt A, Krasteva PV, Gubellini F, Falbel TG, Burton BM, Fronzes R

Link to Pubmed [PMID] – 28618091

Mol. Microbiol. 2017 Sep;105(5):741-754

Pneumococcal natural transformation contributes to genomic plasticity, antibiotic resistance development and vaccine escape. Streptococcus pneumoniae, like many other naturally transformable species, has evolved sophisticated protein machinery for the binding and uptake of DNA. Two proteins encoded by the comF operon, ComFA and ComFC, are involved in transformation but their exact molecular roles remain unknown. In this study, we provide experimental evidence that ComFA binds to single stranded DNA (ssDNA) and has ssDNA-dependent ATPase activity. We show that both ComFA and ComFC are essential for the transformation process in pneumococci. Moreover, we show that these proteins interact with each other and with other proteins involved in homologous recombination, such as DprA, thus placing the ComFA-ComFC duo at the interface between DNA uptake and DNA recombination during transformation.