Rec A Protein is a bacterial recombination protein that enhances interaction and exchange of homologous DNA strands. It regulates repair mechanisms and repairs DNA. Involved in DNA renaturation and rare cleavage of genomic DNA. Binds cooperatively and stechiometrically to single-stranded DNA. In presence of ATP-γ-S, locates and pairs a single-stranded DNA sequence to its homologous double-stranded DNA. Cleaves large fragments of DNA (RARE-Rec A Assisted Restriction Endonuclease). Enhances contrast of electron micrography when DNA is coated with Rec A Protein.