Mechanisms of peroxynitrite-mediated nitration of tyrosine.
Mechanisms of peroxynitrite-mediated nitration of tyrosine.
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DOI:
10.1021/tx800463y
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发表时间:
2009-05
影响因子:
4.1
通讯作者:
Houk, K. N.
中科院分区:
文献类型:
--
作者:
Gunaydin, Hakan;Houk, K. N.
The mechanisms of tyrosine nitration by peroxynitrous acid or nitrosoperoxycarbonate were investigated with the CBS-QB3 method. Either the protonation of peroxynitrite, or a reaction with carbon dioxide gives a reactive peroxide intermediate. Peroxynitrous acid mediated nitration of phenol occurs via the unimolecular decomposition to give nitrogen dioxide and hydroxyl radicals. Nitrosoperoxycarbonate also undergoes unimolecular decomposition to give carbonate and nitrogen dioxide radicals. The reactions of tyrosine with the hydroxyl or carbonate radicals give a phenoxy radical intermediate. The reaction of the nitrogen dioxide with this radical intermediate followed by tautomerization gives nitrated tyrosine in both cases. According to CBS-QB3 calculations, the rate-limiting step for the nitration of phenol is the decomposition of peroxynitrous acid or of nitrosoperoxycarbonate.
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发表时间:
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