Pyruvate kinase type-II isozyme in Plasmodium falciparum localizes to the apicoplast.

Pyruvate kinase type-II isozyme in Plasmodium falciparum localizes to the apicoplast.
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DOI:
10.1016/j.parint.2008.10.005
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发表时间:
2009-03
影响因子:
1.9
通讯作者:
Asai T
Asai T
中科院分区:
医学3区
文献类型:
--
作者:
Maeda T;Saito T;Harb OS;Roos DS;Takeo S;Suzuki H;Tsuboi T;Takeuchi T;Asai T

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恶性疟原虫的生物信息学研究揭示了丙酮酸激酶的两种亚型:I型和II型酶。I型酶显示出典型的糖酵解特性,而II型酶参与脂肪酸II型生物合成,并且已经预测定位于顶质体,其N-末端具有靶向信号。I型和II型同工酶具有与弓形虫同工酶相同的进化起源,分别为TgPyKI和TgPyKII;然而,TgPyKII定位于细胞核和顶质体。因此,我们使用麦胚无细胞表达系统制备了重组的恶性疟原虫丙酮酸激酶II型蛋白的全长,并获得了针对II型蛋白的特异性抗体。荧光显微镜分析显示,恶性疟原虫II型酶仅定位于顶质体,而不是顶体。这些数据表明恶性疟原虫和T.弓形虫丙酮酸激酶亚型。
Bioinformatics research on Plasmodium falciparum revealed two isoforms of pyruvate kinase: type-I and type-II enzymes. The type-I enzyme shows typical glycolytic properties, while type-II enzyme is involved in fatty acid type-II biosynthesis and has been predicted to localize to the apicoplast with the targeting signal in its N-terminus. The type-I and type-II isoforms have the same evolutionary origin as Toxoplasma gondii isozymes, TgPyKI and TgPyKII, respectively; however, TgPyKII localizes to both the mitochondrion and the apicoplast. Accordingly, we made a recombinant full length of P. falciparum pyruvate kinase type-II protein using a wheat germ cell-free expression system and obtained a specific antibody against the type-II protein. Fluorescent microscopic analysis revealed that P. falciparum type-II enzyme was localized only to the apicoplast, not to the mitochondrion. The data suggest differences in localization and metabolic pathways between P. falciparum and T. gondii pyruvate kinase isoforms.
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