Small molecular, macromolecular, and cellular chloramines react with thiocyanate to give the human defense factor hypothiocyanite.

Small molecular, macromolecular, and cellular chloramines react with thiocyanate to give the human defense factor hypothiocyanite.
复制标题

DOI:
10.1021/bi902089w
复制
发表时间:
2010-03-09
期刊:
影响因子:
2.9
通讯作者:
Ashby MT
Ashby MT
中科院分区:
生物学3区
文献类型:
--
作者:
Xulu BA;Ashby MT

文献摘要

参考文献

被引文献

相似文献

硫氰酸盐与髓过氧化物酶衍生的 HOCl 发生非催化反应,产生次硫氰酸盐 (OSCN−),从而潜在地限制 HOCl 造成宿主组织损伤的倾向,从而导致炎症性疾病。然而,SCN− 在体内捕获 HOCl 的效率取决于 SCN− 相对于其他化学靶标的浓度。在血浆中,SCN− 的浓度相对较低,蛋白质可能是 HOCl 的主要初始目标,而氯胺是重要的产物。氯胺最终会分解,对蛋白质造成不可逆转的损害。在本研究中,我们证明 SCN− 与小分子、蛋白质和大肠杆菌细胞中的氯胺有效反应,生成 OSCN− 和母体胺。值得注意的是,OSCN− 与氯胺的反应速度比 SCN− 更快。 SCN− 和 OSCN− 与氯胺的这些反应可以修复 HOCl 对蛋白胺造成的部分损伤。我们的观察结果进一步证明了与次卤酸氧化应激相关的氧化还原级联过程中次级反应的重要性。
Thiocyanate reacts non-catalytically with myeloperoxidase-derived HOCl to produce hypothiocyanite (OSCN−), thereby potentially limiting the propensity of HOCl to inflict host tissue damage that can lead to inflammatory diseases. However, the efficiency with which SCN− captures HOCl in vivo depends on the concentration of SCN− relative to other chemical targets. In blood plasma, where the concentration of SCN− is relatively low, proteins may be the principal initial targets of HOCl, and chloramines are a significant product. Chloramines eventually decompose to irreversibly damage proteins. In the present study, we demonstrate that SCN− reacts efficiently with chloramines in small molecules, in proteins, and in Escherichia coli cells to give OSCN− and the parent amine. Remarkably, OSCN− reacts faster than SCN− with chloramines. These reactions of SCN− and OSCN− with chloramines may repair some of the damage that is inflicted on protein amines by HOCl. Our observations are further evidence for the importance of secondary reactions during the redox cascades that are associated with oxidative stress by hypohalous acids.
DOI: 10.1021/tx900249d
发表时间: 2009-11-01
影响因子: 4.1
作者:
Nagy, Peter;Jameson, Guy N. L.;Winterbourn, Christine C.
通讯作者: Winterbourn, Christine C.
DOI: 10.1021/jo062356k
发表时间: 2007-04-27
影响因子: 3.6
作者:
Calvo, Paula;Crugeiras, Juan;Rios, Miguel A.
通讯作者: Rios, Miguel A.
DOI: 10.1021/tx900212r
发表时间: 2009-09-01
影响因子: 4.1
作者:
Lemma, Kelemu;Ashby, Michael T.
通讯作者: Ashby, Michael T.
DOI: 10.1021/ja0737218
发表时间: 2007-11-14
影响因子: 15
作者:
Nagy, Peter;Ashby, Michael T.
通讯作者: Ashby, Michael T.
DOI: 10.1002/cber.19470800402
发表时间: 1947-01-01
期刊: CHEMISCHE BERICHTE-RECUEIL
影响因子: --
作者:
JANDER, G;GRUTTNER, B
通讯作者: GRUTTNER, B