5u2s | pdb_00005u2s

Pre-catalytic ternary complex of Human DNA Polymerase Beta With Gapped DNA substrate incoming (-)3TC-TP and Ca2+.

spinqualitylabelsall models 5u2s, resolution 2.30Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5u2s is a 4 chain structure with sequence from Homo sapiens and Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.3Å Ligands: 1RZ, ACT, CA, NA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DPOLB_HUMAN Repair polymerase that plays a key role in base-excision repair. Has 5'-deoxyribose-5-phosphate lyase (dRP lyase) activity that removes the 5' sugar phosphate and also acts as a DNA polymerase that adds one nucleotide to the 3' end of the arising single-nucleotide gap. Conducts 'gap-filling' DNA synthesis in a stepwise distributive fashion rather than in a processive fashion as for other DNA polymerases. Publication Abstract from PubMed Nucleoside reverse transcriptase inhibitors (NRTIs) with L-stereochemistry have long been an effective treatment for viral infections because of the strong D-stereoselectivity exhibited by human DNA polymerases relative to viral reverse transcriptases. The D-stereoselectivity of DNA polymerases has only recently been explored structurally and all three DNA polymerases studied to date have demonstrated unique stereochemical selection mechanisms. Here, we have solved structures of human DNA polymerase beta (hPolbeta), in complex with single-nucleotide gapped DNA and L-nucleotides and performed pre-steady-state kinetic analysis to determine the D-stereoselectivity mechanism of hPolbeta. Beyond a similar 180 degrees rotation of the L-nucleotide ribose ring seen in other studies, the pre-catalytic ternary crystal structures of hPolbeta, DNA and L-dCTP or the triphosphate forms of antiviral drugs lamivudine ((-)3TC-TP) and emtricitabine ((-)FTC-TP) provide little structural evidence to suggest that hPolbeta follows the previously characterized mechanisms of D-stereoselectivity. Instead, hPolbeta discriminates against L-stereochemistry through accumulation of several active site rearrangements that lead to a decreased nucleotide binding affinity and incorporation rate. The two NRTIs escape some of the active site selection through the base and sugar modifications but are selected against through the inability of hPolbeta to complete thumb domain closure. Structural basis for the D-stereoselectivity of human DNA polymerase beta.,Vyas R, Reed AJ, Raper AT, Zahurancik WJ, Wallenmeyer PC, Suo Z Nucleic Acids Res. 2017 Apr 10. doi: 10.1093/nar/gkx252. PMID:28402499 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also DNA polymerase 3D structures

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