Effect of DNA Polymerase β Loop Variants on Discrimination ofO6-Methyldeoxyguanosine Modification Present in the Nucleotide versus Template Substrate†

Biochemistry ◽  
2005 ◽  
Vol 44 (30) ◽  
pp. 10378-10387 ◽  
Author(s):  
Subarna Hamid ◽  
Kristin A. Eckert
Keyword(s):  
Dna Polymerase ◽  
Dna Polymerase Β ◽  
Template Substrate

scholarly journals The human checkpoint sensor and alternative DNA clamp Rad9–Rad1–Hus1 modulates the activity of DNA ligase I, a component of the long-patch base excision repair machinery

2005 ◽  
Vol 389 (1) ◽  
pp. 13-17 ◽  
Author(s):  
Ekaterina SMIRNOVA ◽  
Magali TOUEILLE ◽  
Enni MARKKANEN ◽  
Ulrich HÜBSCHER
Keyword(s):  
Quality Control ◽  
Dna Polymerase ◽  
Base Excision Repair ◽  
Excision Repair ◽  
Dna Ligase ◽  
Dna Polymerase Β ◽  
Flap Endonuclease 1 ◽  
Important Target ◽  
Dna Ligase I ◽  
Base Excision

The human checkpoint sensor and alternative clamp Rad9–Rad1–Hus1 can interact with and specifically stimulate DNA ligase I. The very recently described interactions of Rad9–Rad1–Hus1 with MutY DNA glycosylase, DNA polymerase β and Flap endonuclease 1 now complete our view that the long-patch base excision machinery is an important target of the Rad9–Rad1–Hus1 complex, thus enhancing the quality control of DNA.

scholarly journals DNA polymerase β outperforms DNA polymerase γ in key mitochondrial base excision repair activities

DNA Repair ◽  
2021 ◽  
Vol 99 ◽  
pp. 103050
Author(s):  
Beverly A. Baptiste ◽  
Stephanie L. Baringer ◽  
Tomasz Kulikowicz ◽  
Joshua A. Sommers ◽  
Deborah L. Croteau ◽  
...  
Keyword(s):  
Dna Polymerase ◽  
Base Excision Repair ◽  
Excision Repair ◽  
Dna Polymerase Β ◽  
Base Excision ◽  
Dna Polymerase Γ

scholarly journals Molecular disruption of DNA polymerase β for platinum sensitisation and synthetic lethality in epithelial ovarian cancers

Oncogene ◽  
2021 ◽  
Author(s):  
Reem Ali ◽  
Adel Alblihy ◽  
Islam M. Miligy ◽  
Muslim L. Alabdullah ◽  
Mansour Alsaleem ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Cell Cycle Arrest ◽  
Dna Polymerase ◽  
Synthetic Lethality ◽  
Ovarian Cancer Cells ◽  
Dna Polymerase Β ◽  
Mesenchymal Transition ◽  
Platinum Sensitivity ◽  
Cycle Arrest ◽  
Ovarian Cancers

AbstractTargeting PARP1 [Poly(ADP-Ribose) Polymerase 1] for synthetic lethality is a new strategy for BRCA germ-line mutated or platinum sensitive ovarian cancers. However, not all patients respond due to intrinsic or acquired resistance to PARP1 inhibitor. Development of alternative synthetic lethality approaches is a high priority. DNA polymerase β (Polβ), a critical player in base excision repair (BER), interacts with PARP1 during DNA repair. Here we show that polβ deficiency is a predictor of platinum sensitivity in human ovarian tumours. Polβ depletion not only increased platinum sensitivity but also reduced invasion, migration and impaired EMT (epithelial to mesenchymal transition) of ovarian cancer cells. Polβ small molecular inhibitors (Pamoic acid and NSC666719) were selectively toxic to BRCA2 deficient cells and associated with double-strand breaks (DSB) accumulation, cell cycle arrest and increased apoptosis. Interestingly, PARG [Poly(ADP-Ribose) Glycohydrolase] inhibitor (PDD00017273) [but not PARP1 inhibitor (Olaparib)] was synthetically lethal in polβ deficient cells. Selective toxicity to PDD00017273 was associated with poly (ADP-ribose) accumulation, reduced nicotinamide adenine dinucleotide (NAD+) level, DSB accumulation, cell cycle arrest and increased apoptosis. In human tumours, polβ-PARG co-expression adversely impacted survival in patients. Our data provide evidence that polβ targeting is a novel strategy and warrants further pharmaceutical development in epithelial ovarian cancers.

scholarly journals Effect of β,γ-CHF- and β,γ-CHCl-dGTP Halogen Atom Stereochemistry on the Transition State of DNA Polymerase β

Biochemistry ◽  
2012 ◽  
Vol 51 (43) ◽  
pp. 8491-8501 ◽  
Author(s):  
Keriann Oertell ◽  
Yue Wu ◽  
Valeria M. Zakharova ◽  
Boris A. Kashemirov ◽  
David D. Shock ◽  
...  
Keyword(s):  
Transition State ◽  
Dna Polymerase ◽  
Halogen Atom ◽  
Dna Polymerase Β

scholarly journals Base excision repair and design of small molecule inhibitors of human DNA polymerase β

2010 ◽  
Vol 67 (21) ◽  
pp. 3633-3647 ◽  
Author(s):  
Samuel H. Wilson ◽  
William A. Beard ◽  
David D. Shock ◽  
Vinod K. Batra ◽  
Nisha A. Cavanaugh ◽  
...  
Keyword(s):  
Dna Polymerase ◽  
Small Molecule ◽  
Base Excision Repair ◽  
Small Molecule Inhibitors ◽  
Excision Repair ◽  
Dna Polymerase Β ◽  
Human Dna ◽  
Base Excision

Detection and characterization of DNA polymerase activity in Toxoplasma gondii

Parasitology ◽  
1993 ◽  
Vol 107 (2) ◽  
pp. 135-139 ◽  
Author(s):  
A. Makioka ◽  
B. Stavros ◽  
J. T. Ellis ◽  
A. M. Johnson
Keyword(s):  
Toxoplasma Gondii ◽  
Dna Polymerase ◽  
Dna Polymerases ◽  
Sedimentation Coefficient ◽  
Polymerase Activity ◽  
Magnesium Ions ◽  
Dna Polymerase Β ◽  
Human Dna ◽  
Approximate Molecular Weight

SUMMARYA DNA polymerase activity has been detected and characterized in crude extracts from tachzoites of Toxoplasma gondii. The enzyme has a sedimentation coefficient of 6·4 S, corresponding to an approximate molecular weight of 150000 assuming a globular shape. Like mammalian DNA polymerase α, the DNA polymerase of T. gondii was sensitive to N-ethylmaleimide and inhibited by high ionic strength. However, the enzyme activity was not inhibited by aphidicolin which is an inhibitor of mammalian DNA polymerases α, δ and ε and also cytosine-β-D-arabinofuranoside-5′-triphosphate which is an inhibitor of α polymerase. The activity was inhibited by 2′,3′-dideoxythymidine-5′-triphosphate which is an inhibitor of mammalian DNA polymerase β and γ. Magnesium ions (Mg2+) were absolutely required for activity and its optimal concentration was 6 mM. The optimum potassium (K+) concentration was 50 mM and a higher concentration of K+ markedly inhibited the activity. Activity was optimal at pH 8. Monoclonal antibodies against human DNA polymerase did not bind to DNA polymerase of T. gondii. Thus the T. gondii enzyme differs from the human enzymes and may be a useful target for the design of toxoplasmacidal drugs.

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