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Amino Acid Oxidation: A Combined Study of Cysteine Oxo Forms by IRMPD Spectroscopy and Simulations

机译:氨基酸氧化:通过IRMPD光谱学和模拟相结合的半胱氨酸氧化形式的研究

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摘要

The redox activity of cysteine sulfur allows numerous post-translational protein modifications involved in the oxidative regulation of metabolism, in metal binding, and in signal transduction. A combined approach based on infrared multiple photon dissociation spectroscopy at the Centre Laser Infrarouge d'Orsay (CLIO) free electron laser facility, calculations of IR frequencies, and finite temperature ab initio molecular dynamics simulations has been employed to characterize the gas-phase structures of deprotonated cysteine sulfenic, sulfinic, and sulfonic acids, [cysSO(x)](-) (x=1, 2, 3, representing the number of S-bound oxygen atoms), which are key intermediates in the redox-switching chemistry of proteins. The ions show different structural motifs owing to preferential binding of the proton to either the carboxylate or sulfur-containing group. Due to the decreasing basicity of the sulfenic, sulfinic, and sulfonic terminals, the proton bound to SO- in [cysSO](-) migrates to the carboxylate in [cysSO(3)](-), whereas it turns out to be shared in [cysSO(2)](-). Evidence is gathered that a mixture of close-lying low-energy conformers is sampled for each cysteine oxo form in a Paul ion trap at room temperature.
机译:半胱氨酸硫的氧化还原活性使许多翻译后蛋白质修饰参与代谢的氧化调节,金属结合和信号转导。在奥赛中心激光红外(CLIO)自由电子激光设备上基于红外多光子解离光谱的组合方法,红外频率的计算以及从头算的有限温度从头算分子动力学模拟已被用来表征苯胺的气相结构脱质子化的半胱氨酸亚磺酸,亚磺酸和磺酸[cysSO(x)](-)(x = 1、2、3,代表与S结合的氧原子数),它们是氧化还原转换化学中的关键中间体蛋白质。由于质子优先结合到羧酸根或含硫基团上,因此离子显示出不同的结构基序。由于亚硫基,亚磺酸基和磺酸基末端的碱性降低,因此与[cysSO](-)中的SO-结合的质子迁移至[cysSO(3)](-)中的羧酸根,但最终被共享在[cysSO(2)](-)中。收集到的证据是,在室温下,在Paul离子阱中针对每种半胱氨酸羰基形式采样了紧密相近的低能构象体的混合物。

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