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The D N A strand cleavage reaction catalyzed by endonuclease I11 from Escherichia coli (endo 111) on the 3'-side of aldehyde abasic sites proceeds by a syn P-elimination involving abstraction of the 2'-pro-S proton and formation of a trans a,@-unsaturated aldose product; we previously reported the same stereochemical course for the reaction catalyzed by UV endonuclease V from bacteriophage T4 (UV endo V) [Mazumder, A., Gerlt, J. A., Rabow, L., Absalon, M. J., Stubbe, J., & Bolton, P. H. (1989)doi:10.1021/bi00218a033 pmid:1846560 fatcat:vjmpwzhjnjdthie4ersfuduzpe