ATP-dependent conformational change in ABC-ATPase RecF serves as a switch in DNA repair.Tang, Q., Liu, Y.P., Shan, H.H., Tian, L.F., Zhang, J.Z., Yan, X.X.
(2018) Sci Rep 8: 2127-2127
- PubMed: 29391496
- DOI: https://doi.org/10.1038/s41598-018-20557-0
- Primary Citation of Related Structures:
5Z67, 5Z68, 5Z69
- PubMed Abstract:
RecF is a principal member of the RecF pathway. It interacts with RecO and RecR to initiate homologous recombination by loading RecA recombinases on single-stranded DNA and displacing single-stranded DNA-binding proteins. As an ATP-binding cassette ATPase, RecF exhibits ATP-dependent dimerization and structural homology with Rad50 and SMC proteins. However, the mechanism and action pattern of RecF ATP-dependent dimerization remains unclear. Here, We determined three crystal structures of TTERecF, TTERecF-ATP and TTERecF-ATPɤS from Thermoanaerobacter tengcongensis that reveal a novel ATP-driven RecF dimerization. RecF contains a positively charged tunnel on its dimer interface that is essential to ATP binding. Our structural and biochemical data indicate that the Walker A motif serves as a switch and plays a key role in ATP binding and RecF dimerization. Furthermore, Biolayer interferometry assay results showed that the TTERecF interacted with ATP and formed a dimer, displaying a higher affinity for DNA than that of the TTERecF monomer. Overall, our results provide a solid structural basis for understanding the process of RecF binding with ATP and the functional mechanism of ATP-dependent RecF dimerization.
National Laboratory of Biomacromolecules, CAS Center for Excellence in Biomacromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China.