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	Inactivation Kinetics of Polyphenol Oxidase from Pupae of Blowfly (Sarcophaga bullata) in the Dimethyl Sulfoxide Solution
	Li, Zhi-Cong ; Pan, Zhi-Zhen ; Zhu, Yu-Jing ; Wang, Qin ; Chen, Qing-Xi ; Chen QX(陈清西) ; Chen, Chao-Qi（Peking Univ, Coll Urban & Environm Sci） ; Yan, Ruo-Rong ; Yan, Jiang-Hua
	2010
关键词	Polyphenol oxidase Blowfly pupae Inactivation Kinetics Dimethyl sulfoxide
英文摘要	The effects of dimethyl sulfoxide (DMSO) on the activity of polyphenol oxidase (PPO, EC 1.14.18.1) from blowfly pupae for the oxidation of L-3,4-dihydroxyphenylalanine were studied. The results showed that low concentrations of DMSO could lead to reversible inactivation to the enzyme. The IC50 value, the inactivator concentration leading to 50% activity lost, was estimated to be 2.35 M. Inactivation of the enzyme by DMSO was classified as mixed type. The kinetics of inactivation of PPO from blowfly pupae in the low concentrations of DMSO solution was studied using the kinetic method of the substrate reaction. The rate constants of inactivation were determined. The results show that k(+0) was much larger than k(+0)', indicating that the free enzyme molecule was more fragile than the enzyme-substrate complex in the DMSO solution. It was suggested that the presence of the substrate offers marked protection of this enzyme against inactivation by DMSO.; National High Technology Research and Development Program ("863" Program) of China [2006AA10A212]; Postdoctoral Foundation of China [20080430787]; Science and Technology Foundation of Fujian Province [2007N0051]; Program for Innovative Research Team in Science and Technology in Fujian Province University
语种	英语
出版者	HUMANA PRESS INC
内容类型	期刊论文
源URL	[http://dx.doi.org/doi: 10.1007/s12010-009-8714-9]
专题	生命科学－已发表论文
推荐引用方式 GB/T 7714	Li, Zhi-Cong,Pan, Zhi-Zhen,Zhu, Yu-Jing,et al. Inactivation Kinetics of Polyphenol Oxidase from Pupae of Blowfly (Sarcophaga bullata) in the Dimethyl Sulfoxide Solution[J],2010.
APA	Li, Zhi-Cong.,Pan, Zhi-Zhen.,Zhu, Yu-Jing.,Wang, Qin.,Chen, Qing-Xi.,...&Yan, Jiang-Hua.(2010).Inactivation Kinetics of Polyphenol Oxidase from Pupae of Blowfly (Sarcophaga bullata) in the Dimethyl Sulfoxide Solution..
MLA	Li, Zhi-Cong,et al."Inactivation Kinetics of Polyphenol Oxidase from Pupae of Blowfly (Sarcophaga bullata) in the Dimethyl Sulfoxide Solution".(2010).

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