Repair-PPRHs binding to their target sequence. (A) Binding between the radiolabeled dsDNA duplex (Dup50) and the different repair-PPRHs. Lane 1, labeled 32P-polypurine/32P-polypyrimidine dsDNA (Dup50) (0.67 nM); lane 2, 32P-polypyrimidine ssDNA (pPy50) (0.27 nM); lane 3, 32P-polypurine ssDNA (pPu50) (0.42 nM); lane 4, 32P-Dup50 plus HpE2rep; lane 5, 32P-pPy50 plus HpE2rep; lane 6, 32P-Dup50 plus HpE2link; lane 7, 32P-pPy50 plus HpE2link; lane 8, 32P-Dup50 plus HpE2link-ds; lane 9, 32P-pPy50 plus HpE2link-ds; lane 10, 32P-Dup50 plus HpE2ext; lane 11, 32P-pPy50 plus HpE2ext; lane 12, 32P-Dup50 plus dHpE2link-rep; lane 13, 32P-pPy50 plus dHpE2link-rep; lane 14, 32P-Dup50 plus RO18; lane 15, 32P-Dup50 plus RO24. (B) Binding of a longer dsDNA duplex (Dup575) and the radiolabeled HpE2rep. Lane 1, labeled 32P-HpE2rep (0.35 nM); lane 2, 32P-HpE2rep plus Dup576. (+) indicate unlabelled oligonucleotides present in the reaction. Color images available online at www.liebertpub.com/hgtb