National Center for
4ZBY: Family 4 Uracil-dna Glycosylase From Sulfolobus Tokodaii (uracil Complex Form)
Crystal structure of family 4 uracil-DNA glycosylase from Sulfolobus tokodaii and a function of tyrosine 170 in DNA binding
FEBS Lett. (2015) 589 p.2675-2682
Uracil-DNA glycosylases (UDGs) excise uracil from DNA by catalyzing the N-glycosidic bond hydrolysis. Here we report the first crystal structures of an archaeal UDG (stoUDG). Compared with other UDGs, stoUDG has a different structure of the leucine-intercalation loop, which is important for DNA binding. The stoUDG-DNA complex model indicated that Leu169, Tyr170, and Asn171 in the loop are involved in DNA intercalation. Mutational analysis showed that Tyr170 is critical for substrate DNA recognition. These results indicate that Tyr170 occupies the intercalation site formed after the structural change of the leucine-intercalation loop required for the catalysis.