Words similar to abasic

Example sentences for: abasic

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This generates the necessary 3' hydroxyl group for DNA polymerases (pol β, δ or ε, in eukaryotes) to insert the correct nucleotide in later steps in the base excision repair pathway (BER-pathway) [ 7 8 ] . Recent crystal structures of huAPE1 complexed with DNA containing an abasic site [ 9 10 11 ] , combined with sequence analysis and site-directed mutagenesis, have defined the residues that participate in metal ion based cleavage of the phosphate backbone of the DNA [ 12 13 14 15 16 17 ] .
The endonuclease activity of DNase 1 is reduced many fold by integrating this loop from E. coli exonuclease III, but the mutant cleaves at abasic sites in DNA with low efficiency [ 29 ] . Thus additional residues in the APEs control specificity while still allowing a reasonable rate of phosphorolytic cleavage.
This redundancy of binding to the 3' side is unique to APE, as is its strong binding to the DNA opposite the abasic site.
The importance of such bonds for activity was shown in other work, where huAPE1's binding to the DNA backbone is only inhibited by ethylation of the phosphates two and three positions 3' to an abasic site [ 18 ] . Mutation of R177A, at the end of Molego 6, that binds to this region and to the bases opposite the AP-site had enhanced activity [ 11 ] , while mutations at W280 (Molego 11) and F266 (Molego 10) [ 33 ] reduce activity and, in the latter case, substrate selectivity.
Is the specificity of APE determined by binding 3' to an abasic site?