[热带假丝酵母饲料酵母中谷氨酰胺合成酶在镁、锰和钴激活系统中的热稳定性]
[Thermostability of glutamine synthetase in Candida tropicalis feed yeasts in Mg-, Mn- and Co-activated systems].
作者信息
Kretovich V L, Auérman T L, Uralets T I
出版信息
Mikrobiologiia. 1978 Mar-Apr;47(2):217-9.
PMID:26851
Abstract
The thermostability of glutamine synthetase of Candida tropicalis was studied in systems activated by Mg, Mn and Co. The enzyme was found to be very thermolabile. Its thermostability depended on the nature of a bivalent cation used in the reaction mixture. Metals stabilized the enzyme since preincubation with metal cations increased the thermostability of glutamine synthetase. Purification of the enzyme preparation increased the stabilizing action of bivalent cations (Mg2+, Mn2+, Co2+).
摘要
在由镁、锰和钴激活的体系中研究了热带假丝酵母谷氨酰胺合成酶的热稳定性。发现该酶热稳定性很差。其热稳定性取决于反应混合物中所用二价阳离子的性质。金属能使该酶稳定，因为与金属阳离子预温育可提高谷氨酰胺合成酶的热稳定性。酶制剂的纯化增强了二价阳离子（Mg2+、Mn2+、Co2+）的稳定作用。
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