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组氨酰转移核糖核酸与鼠伤寒沙门氏菌组氨酸生物合成的第一种酶之间的相互作用。

Interaction between histidyl transfer ribonucleic acid and the first enzyme for histidine biosynthesis of Salmonella typhimurium.

作者信息

Kovach J S, Phang J M, Blasi F, Barton R W, Ballesteros-Olmo A, Goldberger R F

出版信息

J Bacteriol. 1970 Nov;104(2):787-92. doi: 10.1128/jb.104.2.787-792.1970.

Abstract

Previous studies showed that the enzyme (phosphoribosyltransferase) which catalyzes the first step of the histidine pathway in Salmonella typhimurium plays a role in regulation of the histidine operon. Since histidyl transfer ribonucleic acid (His-tRNA) is required for repression of the histidine operon, we considered the possibility that the role of phosphoribosyltransferase might be realized through an interaction with His-tRNA. One prediction inherent in this idea is that the enzyme should interact with His-tRNA in vitro. Evidence is presented for such an interaction. Binding of (3)H-His-tRNA to purified phosphoribosyltransferase was tested on Sephadex columns and on nitrocellulose filters. The enzyme was found to have a high affinity for tRNA. Comparing the binding of (3)H-His-tRNA with that of tRNA aminoacylated with other (3)H-amino acids disclosed that the binding of the histidyl species of tRNA is favored over that of other species and is dependent upon magnesium-ion concentration.

摘要

先前的研究表明,在鼠伤寒沙门氏菌中催化组氨酸途径第一步的酶(磷酸核糖基转移酶)在组氨酸操纵子的调控中发挥作用。由于组氨酸操纵子的阻遏需要组氨酰转移核糖核酸(His - tRNA),我们考虑了磷酸核糖基转移酶的作用可能通过与His - tRNA相互作用来实现的可能性。这个想法中固有的一个预测是,该酶在体外应该与His - tRNA相互作用。本文提供了这种相互作用的证据。在葡聚糖凝胶柱和硝酸纤维素滤膜上测试了³H - His - tRNA与纯化的磷酸核糖基转移酶的结合。发现该酶对tRNA具有高亲和力。将³H - His - tRNA的结合与用其他³H - 氨基酸氨酰化的tRNA的结合进行比较,结果表明tRNA的组氨酰种类的结合比其他种类更受青睐,并且依赖于镁离子浓度。

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