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• W2117652017 abstract "Specialized DNA polymerases participate in replication stress responses and in DNA repair pathways that function as barriers against cellular senescence and genomic instability. These events can be co-opted by tumor cells as a mechanism to survive chemotherapeutic and ionizing radiation treatments and as such, represent potential targets for adjuvant therapies. Previously, a high-throughput screen of ∼16,000 compounds identified several first generation proof-of-principle inhibitors of human DNA polymerase kappa (hpol κ). The indole-derived inhibitor of 5-lipoxygenase activating protein (FLAP), MK886, was one of the most potent inhibitors of hpol κ discovered in that screen. However, the specificity and mechanism of inhibition remained largely undefined. In the current study, the specificity of MK886 against human Y-family DNA polymerases and a model B-family DNA polymerase was investigated. MK886 was found to inhibit the activity of all DNA polymerases tested with similar IC50 values, the exception being a 6- to 8-fold increase in the potency of inhibition against human DNA polymerase iota (hpol ι), a highly error-prone enzyme that uses Hoogsteen base-pairing modes during catalysis. The specificity against hpol ι was partially abrogated by inclusion of the recently annotated 25 a.a. N-terminal extension. On the basis of Michaelis–Menten kinetic analyses and DNA binding assays, the mechanism of inhibition by MK886 appears to be mixed. In silico docking studies were used to produce a series of models for MK886 binding to Y-family members. The docking results indicate that two binding pockets are conserved between Y-family polymerases, while a third pocket near the thumb domain appears to be unique to hpol ι. Overall, these results provide insight into the general mechanism of DNA polymerase inhibition by MK886." @default.
• W2117652017 created "2016-06-24" @default.
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• W2117652017 date "2013-01-31" @default.
• W2117652017 modified "2023-09-28" @default.
• W2117652017 title "Leukotriene Biosynthesis Inhibitor MK886 Impedes DNA Polymerase Activity" @default.
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• W2117652017 doi "https://doi.org/10.1021/tx300392m" @default.
• W2117652017 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3578163" @default.
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