This entry represents the primase-polymerase domain (Prim-Pol) of bacterial LigD proteins, such as LigD from Pseudomonas aeruginosa and Mycobacterium tuberculosis. LigD, together with Ku protein, is required for nonhomologous end-joining (NHEJ)-mediated repair of DNA double-strand breaks (DSB). This domain belongs to the archaeal/eukaryal primase (AEP) superfamily and mediates several nucleotidyl transferase activities, including DNA-dependent RNA primase, terminal transferase and DNA-dependent DNA/RNA gap-filling polymerase activities [1-5].

1: Crystal structure of a DNA-dependent RNA polymerase (DNA primase). Augustin MA, Huber R, Kaiser JT; Nat Struct Biol. 2001;8:57-61. PMID:11135672

2: Crystal structure of the Pyrococcus horikoshii DNA primase-UTP complex: implications for the mechanism of primer synthesis. Ito N, Nureki O, Shirouzu M, Yokoyama S, Hanaoka F; Genes Cells. 2003;8:913-923. PMID:14750947

3: Structure of the heterodimeric core primase. Lao-Sirieix SH, Nookala RK, Roversi P, Bell SD, Pellegrini L; Nat Struct Mol Biol. 2005;12:1137-1144. PMID:16273105

4: Atomic structure and nonhomologous end-joining function of the polymerase component of bacterial DNA ligase D. Zhu H, Nandakumar J, Aniukwu J, Wang LK, Glickman MS, Lima CD, Shuman S; Proc Natl Acad Sci U S A. 2006;103:1711-1716. PMID:16446439

5: Structure and function of a mycobacterial NHEJ DNA repair polymerase. Pitcher RS, Brissett NC, Picher AJ, Andrade P, Juarez R, Thompson D, Fox GC, Blanco L, Doherty AJ; J Mol Biol. 2007;366:391-405. PMID:17174332