The organometallic anticancer complex [(η6-p-cymene)Ru(en)Cl]PF6 (1, en = ethylenediamine) readily reacts with thiols and forms stable sulfenate/sulfinate adducts which may be important for its biological activity. Protein tyrosine phosphatase 1B (PTP1B), a therapeutic target, contains a catalytic cysteinyl thiol and is involved in the regulation of insulin signaling and the balance of protein tyrosine kinase activity. On oxidation, the catalytic Cys215 can form an unusual sulfenyl-amide intermediate which can subsequently be reduced by glutathione. Here we study reactions of 1 with 2-mercaptobenzanilide, 2, a recognized model for the active site of PTP1B. We have characterized crystallographically compound 2 and its oxidized sulfenyl-amide derivative 2-phenyl-1,2-benzisothiazol-3(2H)-one (4), which shows a close structural similarity to the sulfenyl-amide in oxidized PTP1B. At pH 7.4 and 5.3, 1 reacted with 2, affording a mono-ruthenium thiolato complex [(η6-cym)Ru(en)(S-RS)]+ (7+, R = (C6H4)CONH(C6H5)) and a triply-S-bridged thiolato complex [((η6-cym)Ru)2(μ-S-RS)3]+ (8+), respectively. Coordination of Ru to the S atom in 7 allows formation of a strong H-bond (2.02 Ã
) between the en-NH and the carbonyl oxygen. To assess the possible effect of ruthenium coordination on the redox regulation of PTP1B, reactions of these thiolato products with H2O2 and/or GSH were then investigated, demonstrating that coordination to Ru largely retards both the oxidation (deactivation) of the thiol in compound 2 by H2O2 and the subsequent reduction (reactivation) of the sulfenyl-amide by GSH, implying that the inhibition of complex 1 on PTP1B (IC50 of 19 μM) may be attributed to coordination to its catalytic cysteine.
有机
金属抗癌复合物[(η^6-p-石榴烯)Ru(en)Cl]PF6 (1, en =
乙二胺)能够迅速与
硫醇反应,形成稳定的
亚硫酸盐/
亚硫酸酯加合物,这可能对其
生物活性具有重要作用。蛋白
酪氨酸磷酸酶1B (
PTP1B)是一种治疗靶点,含有一个催化性半胱
氨酸
硫醇,参与
胰岛素信号传导和
蛋白酪氨酸激酶活性平衡的调节。在氧化过程中,催化性Cys215可以形成一种不寻常的亚
硫酰胺中间体,随后可以通过
谷胱甘肽还原。在这里,我们研究了1与2-巯基苯乙酰胺(2)之间的反应,2被视为
PTP1B活性位点的典型模型。我们通过晶体学对化合物2及其氧化的亚
硫酰胺衍
生物2-苯基-1,2-苯并
异噻唑-3(2H)-酮(4)进行了表征,发现其在结构上与氧化的
PTP1B中的亚
硫酰胺非常相似。在pH 7.4和5.3条件下,1与2反应,分别生成单
铑硫醇化合物[(η^6-石榴烯)Ru(en)(S-RS)]+ (7+, R = (
C6H4)CONH(
C6H5))和三
硫桥联
硫醇化合物[((η^6-石榴烯)Ru)2(μ-S-RS)3]+ (8+)。在复合物7中,Ru与S原子的配位使得en-NH与羰基氧之间形成强氢键(2.02 Å)。为了评估
铑配位对
PTP1B的氧化还原调控的可能影响,随后研究了这些
硫醇化合物与
H2O2和/或
谷胱甘肽的反应,结果表明,配位于Ru显著延缓了 对化合物2中
硫醇的氧化(失活)以及
谷胱甘肽对亚
硫酰胺的后续还原(再活化),这暗示了复合物1对
PTP1B的抑制(IC50为19 μM)可能归因于其与催化性半胱
氨酸的配位。