4juz

Ternary complex of gamma-OHPDG adduct modified dna (zero primer) with dna polymerase iv and incoming dgtp

spinqualitylabelsall models 4juz, resolution 2.65Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4juz is a 3 chain structure with sequence from Saccharolobus solfataricus P2. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CA, DGT, KAG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DPO4_SACS2 Poorly processive, error-prone DNA polymerase involved in untargeted mutagenesis. Copies undamaged DNA at stalled replication forks, which arise in vivo from mismatched or misaligned primer ends. These misaligned primers can be extended by PolIV. Exhibits no 3'-5' exonuclease (proofreading) activity. It is involved in translesional synthesis. Publication Abstract from PubMed Acrolein, a mutagenic aldehyde, reacts with deoxyguanosine (dG) to form 3-(2'-deoxy-beta-d-erythro-pentofuranosyl)-5,6,7,8-tetrahydro-8-hydroxypyrimido[1 ,2-a] purin-10(3H)-one (gamma-OH-PdG). When placed opposite deoxycytosine (dC) in DNA, gamma-OH-PdG undergoes ring-opening to the N2-(3-oxopropyl)-dG. Ring-opening of the adduct has been hypothesized to facilitate nonmutagenic bypass, particularly by DNA polymerases of the Y family. This study examined the bypass of gamma-OH-PdG by Sulfolobus solfataricus Dpo4, the prototypic Y-family DNA polymerase, using templates that contained the adduct in either the 5'-CXG-3' or the 5'-TXG-3' sequence context. Although gamma-OH-PdG partially blocked Dpo4-catalyzed DNA synthesis, full primer extension was observed, and the majority of bypass products were error-free. Conversion of the adduct into an irreversibly ring-opened derivative prior to reaction facilitated bypass and further improved the fidelity. Structures of ternary Dpo4.DNA.dNTP complexes were determined with primers that either were positioned immediately upstream of the lesion (preinsertion complexes) or had a 3'-terminal dC opposite the lesion (postinsertion complexes); the incoming nucleotides, either dGTP or dATP, were complementary to the template 5'-neighbor nucleotide. In both postinsertion complexes, the adduct existed as ring-opened species, and the resulting base-pair featured Watson-Crick hydrogen bonding. The incoming nucleotide paired with the 5'-neighbor template, while the primer 3'-hydroxyl was positioned to facilitate extension. In contrast, gamma-OH-PdG was in the ring-closed form in both preinsertion complexes, and the overall structure did not favor catalysis. These data provide insights into gamma-OH-PdG chemistry during replication bypass by the Dpo4 DNA polymerase and may explain why gamma-OH-PdG-induced mutations due to primer-template misalignment are uncommon. Ring-Opening of the gamma-OH-PdG Adduct Promotes Error-Free Bypass by the Sulfolobus solfataricus DNA Polymerase Dpo4.,Shanmugam G, Minko IG, Banerjee S, Christov PP, Kozekov ID, Rizzo CJ, Lloyd RS, Egli M, Stone MP Chem Res Toxicol. 2013 Aug 16. PMID:23947567 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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