The role of metacaspase 1 in Plasmodium berghei development and apoptosis.

The role of metacaspase 1 in Plasmodium berghei development and apoptosis.
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DOI:
10.1016/j.molbiopara.2007.01.016
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发表时间:
2007-05
影响因子:
1.5
通讯作者:
Dessens, Johannes T.
Dessens, Johannes T.
中科院分区:
医学4区
文献类型:
--
作者:
Le Chat, Ludovic;Sinden, Robert E.;Dessens, Johannes T.

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疟疾寄生虫编码广泛的蛋白酶,这些蛋白酶是促进其在脊椎动物和昆虫宿主中的许多发育转变所必需的。其中一种预测的半胱氨酸蛋白酶在结构上与胱天蛋白酶相关,称为疟原虫metacaspase 1(PxMC 1)。我们已经产生了伯氏疟原虫寄生虫,其中PbMC 1编码序列被删除,并替换为一个绿色荧光报告基因,以研究PbMC 1的表达,其对寄生虫发育的贡献,以及其参与先前报道的伯氏疟原虫动合子的凋亡样细胞死亡。我们的研究结果表明,pbmc 1基因表达在雌性配子体和所有下游阶段的蚊子,包括子孢子,但不是在无性血液阶段。我们未能检测到一个明显的功能丧失表型,这表明PbMC1构成了一个功能冗余基因。我们讨论这些发现的背景下,我们在这里描述的其他两个假定的疟原虫metacaspases。
The malaria parasite encodes a wide range of proteases necessary to facilitate its many developmental transitions in vertebrate and insect hosts. Amongst these is a predicted cysteine protease structurally related to caspases, named Plasmodium metacaspase 1 (PxMC1). We have generated Plasmodium berghei parasites in which the PbMC1coding sequence is removed and replaced with a green fluorescent reporter gene to investigate the expression of PbMC1, its contribution to parasite development, and its involvement in previously reported apoptosis-like cell death of P. berghei ookinetes. Our results show that the pbmc1 gene is expressed in female gametocytes and all downstream mosquito stages including sporozoites, but not in asexual blood stages. We failed to detect an apparent loss-of-function phenotype, suggesting that PbMC1 constitutes a functionally redundant gene. We discuss these findings in the context of two other putative Plasmodium metacaspases that we describe here.
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