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• W2031297341 abstract "Human endonuclease III (hNth1) is a DNA glycosylase/apurinic/apyrimidinic (AP) lyase that initiates base excision repair of pyrimidines modified by reactive oxygen species, ionizing, and ultraviolet radiation. Using duplex 2′-deoxyribose oligonucleotides containing an abasic (AP) site, a thymine glycol, or a 5-hydroxyuracil residue as substrates, we found the AP lyase activity of hNth1 was 7 times slower than its DNA glycosylase activity, similar to results reported for murine and human 8-oxoguanine-DNA glycosylase, which are also members of the endonuclease III family. This difference in rates contrasts with the equality of rates found in Escherichia coli and Saccharomyces cerevisiae endonuclease III homologs. A yeast two-hybrid screen for potential modulators of hNth1 activity revealed interaction with the damage-inducible transcription factor Y box-binding protein 1 (YB-1), also identified as DNA-binding protein B (DbpB). The in vitro addition of His6YB-1 to hNth1 increased the rate of DNA glycosylase and AP lyase activity. Analysis revealed that YB-1 affects the steady state equilibrium between the covalent hNth1-AP site Schiff base ES intermediate and the noncovalent ES intermediate containing the AP aldehydic sugar and the e-amino group of the hNth1 active site lysine. This equilibrium may be a checkpoint in modulating hNth1 activity." @default.
• W2031297341 created "2016-06-24" @default.
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• W2031297341 date "2001-06-01" @default.
• W2031297341 modified "2023-10-16" @default.
• W2031297341 title "Stimulation of Human Endonuclease III by Y Box-binding Protein 1 (DNA-binding Protein B)" @default.
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• W2031297341 doi "https://doi.org/10.1074/jbc.m101594200" @default.
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