ssDNA-binding protein that contributes to the ionizing radiation resistance of D.radiodurans. Plays a role in DNA repair and genome reconstitution, in a RecA-independent process, since DdrA is essential for recovery from severe genomic fragmentation as a result of exposure to severe levels of ionizing radiation in an environment lacking nutrients. In vitro, binds to the 3'-ends of single-stranded DNA, protecting them from nuclease degradation. Thus, DdrA is part of a DNA end-protection system that helps to preserve genome integrity following irradiation or desiccation. Does not display DNA strand annealing activity, unlike eukaryotic Rad52 protein homologs