Genome-wide detection of serpentine receptor-like proteins in malaria parasites.

Genome-wide detection of serpentine receptor-like proteins in malaria parasites.
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DOI:
10.1371/journal.pone.0001889
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发表时间:
2008-03-26
期刊:
影响因子:
3.7
通讯作者:
Garcia CR
Garcia CR
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Madeira L;Galante PA;Budu A;Azevedo MF;Malnic B;Garcia CR

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丝氨酸蛋白酶受体包括分布在不同生物体(例如细菌、真菌、植物和所有后生动物)上的膜受体的大家族。然而,蛇形受体在原生动物寄生虫中的存在迄今为止在很大程度上是未知的。在本研究中,我们进行了全基因组搜索的蛋白质含有7个跨膜结构域(7-TM)的人恶性疟原虫,并确定了四个蛇形受体样蛋白。这些蛋白质,表示为PfSR 1,PfSR 10,PfSR 12和PfSR 25,显示膜拓扑结构,类似于属于不同家族的蛇形受体的成员所表现出的那些。通过真实的时间PCR检测pfsrs基因在恶性疟原虫红内期的表达,表明它们可能编码功能蛋白。我们还发现了相应的同系物的PfSR在其他五个疟原虫物种,灵长类动物和啮齿类动物的寄生虫。PfSR 10和25是不同物种中最保守的受体,而PfSR 1和12则更趋不同。有趣的是,我们发现PfSR 10和PfSR 12与其他生物体的孤儿蛇形受体具有相似性。潜在的寄生虫膜受体的鉴定为疟疾寄生虫宿主细胞感染的基本方面提出了一个新的视角。
Serpentine receptors comprise a large family of membrane receptors distributed over diverse organisms, such as bacteria, fungi, plants and all metazoans. However, the presence of serpentine receptors in protozoan parasites is largely unknown so far. In the present study we performed a genome-wide search for proteins containing seven transmembrane domains (7-TM) in the human malaria parasite Plasmodium falciparum and identified four serpentine receptor-like proteins. These proteins, denoted PfSR1, PfSR10, PfSR12 and PfSR25, show membrane topologies that resemble those exhibited by members belonging to different families of serpentine receptors. Expression of the pfsrs genes was detected by Real Time PCR in P. falciparum intraerythrocytic stages, indicating that they potentially code for functional proteins. We also found corresponding homologues for the PfSRs in five other Plasmodium species, two primate and three rodent parasites. PfSR10 and 25 are the most conserved receptors among the different species, while PfSR1 and 12 are more divergent. Interestingly, we found that PfSR10 and PfSR12 possess similarity to orphan serpentine receptors of other organisms. The identification of potential parasite membrane receptors raises a new perspective for essential aspects of malaria parasite host cell infection.
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