汞离子对菠菜（Spinacia oleracea）叶绿体果糖-1,6-二磷酸酶的刺激作用。

Stimulation of spinach (Spinacia oleracea) chloroplast fructose-1,6-bisphosphatase by mercuric ions.

作者信息

Ashton A R, Siegel G M

机构信息

Lehrstuhl für Pflanzenphysiologie, Universität Bayreuth, Germany.

出版信息

FEBS Lett. 1997 May 12;408(1):30-2. doi: 10.1016/s0014-5793(97)00385-2.

DOI:10.1016/s0014-5793(97)00385-2

PMID:9180262

Abstract

Chloroplast fructose-1,6-bisphosphatase can exist in an active reduced form or a less active oxidised form. Oxidised fructose bisphosphatase from spinach (Spinacia oleracea) could be stimulated up to many hundred-fold by 0.1 mM HgCl2 whereas fructose bisphosphatases from rabbit, yeast, a non-chloroplast enzyme from spinach and the reduced chloroplast enzyme were only inhibited by HgCl2. Stimulation of the enzyme was maximal at pH 8.0 and low magnesium concentrations where the oxidised enzyme normally has little activity.

摘要

叶绿体果糖-1,6-二磷酸酶可以以活性还原形式或活性较低的氧化形式存在。菠菜（Spinacia oleracea）的氧化型果糖二磷酸酶可被0.1 mM HgCl₂刺激高达数百倍，而来自兔子、酵母、菠菜的一种非叶绿体酶以及还原型叶绿体酶的果糖二磷酸酶仅受到HgCl₂的抑制。该酶在pH 8.0和低镁浓度下刺激作用最大，而在这种情况下氧化型酶通常活性很低。