Transformation of the {Fe(NO)2}9 dinitrosyl iron complexes (DNICs) into S-nitrosothiols (RSNOs) triggered by acid-base pairs.

Transformation of the {Fe(NO)2}9 dinitrosyl iron complexes (DNICs) into S-nitrosothiols (RSNOs) triggered by acid-base pairs.
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由酸碱对触发 {Fe(NO)2}9 二亚硝基铁络合物 (DNIC) 转化为 S-亚硝基硫醇 (RSNO)。

DOI:
10.1002/chem.201100253
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发表时间:
2011
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影响因子:
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通讯作者:
W. Liaw
W. Liaw
中科院分区:
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文献类型:
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作者:
Chih;W. Liaw

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证明了二亚硝酰铁络合物(DNIC)的配位硫醇盐的S-亚硝化生成S-亚硝基硫醇(RSNOs)。[{(NO)(2)Fe(μ-StBu)}(2)](1-tBuS)向{Fe(NO)(2)}(9)DNIC [(NO)(2)Fe(StBu)(MeIm)](2-MeIm)的转化在将20当量的1-甲基咪唑(MeIm)加入到1-tBuS的THF溶液中时发生。 在配合物1-NAP的DMSO溶液中,还观察到{Fe(NO)(2)}(9)[(NO)(2)Fe(S-NAP)(dmso)](2-dmso)(NAP = N-乙酰基-D-青霉胺)与[{(NO)(2)Fe(μ-S-NAP)}(2)](1-NAP)之间的动态相互转化。与配合物2-MeIm和bis的反应相反,(二甲基硫代氨基甲酰基)二硫化物((DTC)(2)),得到{Fe(NO)}(7)[(NO)Fe(DTC)(2)](3)(DTC = S(2)CNMe(2))伴随(tBuS)(2)和NO(g),{Fe(NO)(2)}(9)2-MeIm(2-dmso)转化为RSNOs(RS = tBuS,NAP-S)沿着由(DTC)的Brønsted酸溶液诱导的络合物3(2)表明Brønsted酸可能在触发DNIC 2-MeIm(或2-dmso)的配位硫醇盐的S-亚硝化以产生RSNO中起关键作用。也就是说,DNIC介导的S-亚硝化需要布朗斯特酸-路易斯碱对来产生RSNO。DNIC向RSNO的转化可能仅发生在含一个硫醇盐的{Fe(NO)(2)}(9)DNIC上,而含两个硫醇盐的DNIC [(NO)(2)Fe(SR)(2)](-)被布朗斯台德酸质子化产生[{(NO)(2)Fe(μ-SR)}(2)]。这些结果可能合理化,已知的蛋白质-Cys-SNO位点来自DNIC位于邻近的酸和碱基序,并没有蛋白质结合的SNO的特征,迄今已被直接从生物学中的[蛋白质-(半胱氨酸)(2)Fe(NO)(2)]。
S-nitrosation of the coordinated thiolate of dinitrosyl iron complexes (DNICs) to generate S-nitrosothiols (RSNOs) was demonstrated. Transformation of [{(NO)(2)Fe(μ-StBu)}(2)] (1-tBuS) into the {Fe(NO)(2)}(9) DNIC [(NO)(2)Fe(StBu)(MeIm)] (2-MeIm) occurs under addition of 20 equiv of 1-methylimidazole (MeIm) into a solution of 1-tBuS in THF. The dynamic interconversion between {Fe(NO)(2)}(9) [(NO)(2)Fe(S-NAP)(dmso)] (2-dmso) (NAP = N-acetyl-D-penicillamine) and [{(NO)(2)Fe(μ-S-NAP)}(2)] (1-NAP) was also observed in a solution of complex 1-NAP in DMSO. In contrast to the reaction of complex 2-MeIm and bis(dimethylthiocarbamoyl) disulfide ((DTC)(2)) to yield {Fe(NO)}(7)[(NO)Fe(DTC)(2)] (3) (DTC = S(2)CNMe(2)) accompanied by (tBuS)(2) and NO(g), transformation of {Fe(NO)(2)}(9) 2-MeIm (2-dmso) into RSNOs (RS = tBuS, NAP-S) along with complex 3 induced by the Brønsted acid solution of (DTC)(2) demonstrated that Brønsted acid may play a critical role in triggering S-nitrosation of the coordinated thiolate of DNICs 2-MeIm (or 2-dmso) to produce RSNOs. That is, DNIC-mediated S-nitrosation requires a Brønsted acid-Lewis base pair to produce RSNO. Transformation of DNICs into RSNOs may only occur on the one-thiolate-containing {Fe(NO)(2)}(9) DNICs, in contrast to protonation of the two-thiolate-containing DNICs [(NO)(2)Fe(SR)(2)](-) by Brønsted acid to yield [{(NO)(2)Fe(μ-SR)}(2)]. These results might rationalize that the known protein-Cys-SNO sites derived from DNICs were located adjacent to acid and base motifs, and no protein-bound SNO characterized to date has been directly derived from [protein-(cysteine)(2)Fe(NO)(2)] in biology.
金属硫蛋白与 Fe2 和 NO 反应形成具有 A g = 2.039 ESR 信号的产物。
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