Transient model of thermal deactivation of enzymes.

Transient model of thermal deactivation of enzymes.
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酶热失活的瞬态模型。

DOI:
10.1016/j.bbapap.2011.06.010
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发表时间:
2011
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Golovlev,Val
Golovlev,Val
中科院分区:
--
文献类型:
--
作者:
Chen,NelsonG;Gregory,Kalvin;Sun,Ye;Golovlev,Val

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酶失活的动力学提供了对决定任何酶的生物功能水平的过程的有用见解。萤火虫荧光素酶是一种方便的酶系统,用于研究各种外部因素(物理或化学性质)引起的酶失活、重折叠和变性的机制和动力学。在这份报告中,我们提出了一个由温度升高引起的荧光素酶失活的研究(即,热失活)。我们发现,失活发生通过一个可逆的中间状态,可以描述的瞬态模型,包括活性和可逆的非活性状态。该模型可以作为一个通用的框架,用于分析复杂的,多指数瞬态动力学,可以观察到一些酶的反应进程测定。在这项研究中,瞬态模型已被用来开发一个分析模型,研究荧光素酶失活的时间过程。该模型可能适用于一般酶,并可用于确定是否暴露于外部因素,物理或化学性质的酶,经历与热失活机制相一致的结构转变。
The kinetics of enzyme deactivation provide useful insights on processes that determine the level of biological function of any enzyme. Photinus pyralis (firefly) luciferase is a convenient enzyme system for studying mechanisms and kinetics of enzyme deactivation, refolding, and denaturation caused by various external factors, physical or chemical by nature. In this report we present a study of luciferase deactivation caused by increased temperature (i.e., thermal deactivation). We found that deactivation occurs through a reversible intermediate state and can be described by a Transient model that includes active and reversibly inactive states. The model can be used as a general framework for analysis of complex, multiexponential transient kinetics that can be observed for some enzymes by reaction progression assays. In this study the Transient model has been used to develop an analytical model for studying a time course of luciferase deactivation. The model might be applicable toward enzymes in general and can be used to determine if the enzyme exposed to external factors, physical or chemical by nature, undergoes structural transformation consistent with thermal mechanisms of deactivation.
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