Computational studies of DNA base repair mechanisms by nonheme iron dioxygenases: selective epoxidation and hydroxylation pathways

Dalton Transactions : an International Journal of Inorganic Chemistry
Reza LatifiLaleh Tahsini

Abstract

DNA base repair mechanisms of alkylated DNA bases is an important reaction in chemical biology and particularly in the human body. It is typically catalyzed by an α-ketoglutarate-dependent nonheme iron dioxygenase named the AlkB repair enzyme. In this work we report a detailed computational study into the structure and reactivity of AlkB repair enzymes with alkylated DNA bases. In particular, we investigate the aliphatic hydroxylation and C[double bond, length as m-dash]C epoxidation mechanisms of alkylated DNA bases by a high-valent iron(iv)-oxo intermediate. Our computational studies use quantum mechanics/molecular mechanics methods on full enzymatic structures as well as cluster models on active site systems. The work shows that the iron(iv)-oxo species is rapidly formed after dioxygen binding to an iron(ii) center and passes a bicyclic ring structure as intermediate. Subsequent cluster models explore the mechanism of substrate hydroxylation and epoxidation of alkylated DNA bases. The work shows low energy barriers for substrate activation and consequently energetically feasible pathways are predicted. Overall, the work shows that a high-valent iron(iv)-oxo species can efficiently dealkylate alkylated DNA bases and return th...Continue Reading

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Citations

Jun 13, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Fabián G Cantú ReinhardSam P de Visser
Jul 1, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Hsing-Yin Chen, Yu-Fen Lin
Sep 30, 2021·Physical Chemistry Chemical Physics : PCCP·Madison B BergerG Andrés Cisneros

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Methods Mentioned

BETA
X-ray

Software Mentioned

PROPKA
DL
Poly
Gaussian
pdb2pqr
CHARMM

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