21984208 , Related PDB ids: 3SP4, 3SPD, 3SPL
- Gong Y, Zhu D, Ding J, Dou CN, Ren X, Gu L, Jiang T, Wang DC
- Crystal structures of aprataxin ortholog Hnt3 reveal the mechanism for reversal of 5'-adenylated DNA.
- Nat Struct Mol Biol. 2011 Oct 9;18(11):1297-9. doi: 10.1038/nsmb.2145.
- Aprataxin is a DNA deadenylase that resolves DNA 5'-AMP termini and reverses abortive DNA ligation. The crystal structures of Schizosaccharomyces pombe aprataxin Hnt3 in its apo form and in complex to dsDNA and dsDNA-AMP reveal how Hnt3 recognizes and processes 5'-adenylated DNA in a structure-specific manner. The bound DNA adopts a 5'-flap conformation that facilitates 5'-AMP access to the active site, where AMP cleavage occurs by a canonical catalytic mechanism.