Binding mechanism, photo-induced cleavage and computational studies of interaction cefepime drug with Human serum albumin.

IF 2.7 3区 生物学 Q3 BIOCHEMISTRY & MOLECULAR BIOLOGY
Waddhaah M Al-Asbahy, Manal Shamsi, Ahmed Senan, Niyazi Al-Areqi
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引用次数: 0

Abstract

The binding interaction of cefepime to human serum albumin (HSA) in aqueous solution was investigated by molecular spectroscopy (UV spectra, fluorescence spectra and CD spectra), photo-cleavage and modeling studies under simulative physiological conditions. Spectrophotometric results are rationalized in terms of a static quenching process and binding constant (Kb) and the number of binding sites (n ≈ 1) were calculated using fluorescence quenching approaches at three temperature settings. Thermodynamic data of ΔG, ΔH and ΔS at different temperatures were evaluated. The results showed that the electrostatic and hydrogen bonding interactions play a major role in the binding of cefepime to HSA. The value of 3.4 nm for the distance r between the donor (HSA) and acceptor (cefepime) was derived from the fluorescence resonance energy transfer (FRET). FTIR and CD measurements has been reaffirmed HSA-cefepime association and demonstrated reduction in α-helical content of HSA. Furthermore, the study of molecular modeling also indicated that cefepime could strongly bind to the site I (subdomain IIA) of HSA. Additionally, cefepime shows efficient photo- cleavage of HSA cleavage. Our results may provide valuable information to understand the pharmacological profile of cefepime drug delivery in blood stream.

头孢吡肟药物与人血清白蛋白相互作用的结合机制、光诱导裂解和计算研究。
在模拟生理条件下,通过分子光谱(紫外光谱、荧光光谱和 CD 光谱)、光裂解和建模研究,对水溶液中头孢吡肟与人血清白蛋白(HSA)的结合相互作用进行了研究。分光光度测定结果根据静态淬灭过程和结合常数(Kb)进行了合理化,并利用三种温度设置下的荧光淬灭方法计算了结合位点的数量(n ≈ 1)。评估了不同温度下的 ΔG、ΔH 和 ΔS 的热力学数据。结果表明,静电和氢键相互作用在头孢吡肟与 HSA 的结合中起着主要作用。供体(HSA)和受体(头孢吡肟)之间的距离 r 值为 3.4 nm,这是通过荧光共振能量转移(FRET)得出的。傅立叶变换红外光谱和光盘测量再次证实了 HSA 与头孢吡肟的结合,并证明了 HSA α-螺旋含量的减少。此外,分子建模研究还表明,头孢吡肟能与 HSA 的 I 位点(IIA 子域)紧密结合。此外,头孢吡肟还能有效地光裂解 HSA。我们的研究结果可为了解头孢吡肟在血流中给药的药理学特性提供有价值的信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Biomolecular Structure & Dynamics
Journal of Biomolecular Structure & Dynamics 生物-生化与分子生物学
CiteScore
8.90
自引率
9.10%
发文量
597
审稿时长
2 months
期刊介绍: The Journal of Biomolecular Structure and Dynamics welcomes manuscripts on biological structure, dynamics, interactions and expression. The Journal is one of the leading publications in high end computational science, atomic structural biology, bioinformatics, virtual drug design, genomics and biological networks.
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