6lpm | pdb_00006lpm

Crystal structure of AP endonuclease from Deinococcus radioduran

spinqualitylabelsall models 6lpm, resolution 1.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6lpm is a 1 chain structure with sequence from "micrococcus_radiodurans"_raj_et_al._1960 "micrococcus radiodurans" raj et al. 1960. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Gene: xth, DXG80_11425 ("Micrococcus radiodurans" Raj et al. 1960) Activity: Exodeoxyribonuclease III, with EC number 3.1.11.2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Various endogenous and exogenous agents cause DNA damage, including apurinic/apyrimidinic (AP) sites. Due to their cytotoxic effects, AP sites are usually cleaved by AP endonuclease through the base excision repair (BER) pathway. Deinococcus radiodurans, an extraordinary radiation-resistant bacterium, is known as an ideal model organism for elucidating DNA repair processes. Here, we have investigated a unique AP endonuclease (DrXth) from D. radiodurans and found that it possesses AP endonuclease, 3'-phosphodiesterase, 3'-phosphatase, and 3'-5' exonuclease but has no nucleotide incision repair (NIR) activity. We also found that Mg(2+) and Mn(2+) were the preferred divalent metals for endonuclease and exonuclease activities, respectively. In addition, DrXth were crystallized and the crystals diffracted to 1.5 A. Structural and biochemical analyses demonstrated that residue Gly198 is the key residue involved in the substrate DNA binding and cleavage. Deletion of the drxth gene in D. radiodurans caused elevated sensitivity to DNA damage agents and increased spontaneous mutation frequency. Overall, our results indicate that DrXth is an important AP endonuclease involved in BER pathway and functions in conjunction with other DNA repair enzymes to maintain the genome stability. Structural and Functional Characterization of a Unique AP Endonuclease From Deinococcus radiodurans.,He Y, Wang Y, Qin C, Xu Y, Cheng K, Xu H, Tian B, Zhao Y, Wang L, Hua Y Front Microbiol. 2020 Jun 5;11:1178. doi: 10.3389/fmicb.2020.01178. eCollection, 2020. PMID:33117296 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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