Leucine-rich repeat protein complex activates mosquito complement in defense against Plasmodium parasites.

Leucine-rich repeat protein complex activates mosquito complement in defense against Plasmodium parasites.
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DOI:
10.1126/science.1171400
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发表时间:
2009-04-10
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Christophides GK
Christophides GK
中科院分区:
其他
文献类型:
--
作者:
Povelones M;Waterhouse RM;Kafatos FC;Christophides GK

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富含亮氨酸重复序列的蛋白质在植物和动物中是宿主防御的核心。我们发现,在蚊子冈比亚按蚊,两个这样的蛋白质,拮抗疟疾寄生虫感染,LRIM1和APL1C,在血淋巴中循环作为一个高分子量的复合物举行在一起的二硫键。该复合物与补体C3样蛋白TEP1相互作用,促进其裂解或稳定化,并随后定位在中肠侵入伯氏疟原虫寄生虫的表面上,靶向它们进行破坏。LRIM1和APL1C是一个蛋白质家族的成员,在其他疾病媒介蚊子中具有直系同源物,并且似乎是蚊子对人类病原体的先天防御中的重要效应子。
Leucine-rich repeat containing proteins are central to host defense in plants and animals. We show that in the mosquito Anopheles gambiae, two such proteins that antagonize malaria parasite infections, LRIM1 and APL1C, circulate in the hemolymph as a high molecular weight complex held together by disulfide bridges. The complex interacts with the complement C3-like protein, TEP1, promoting its cleavage or stabilization, and its subsequent localization on the surface of midgut-invading Plasmodium berghei parasites, targeting them for destruction. LRIM1 and APL1C are members of a protein family with orthologs in other disease vector mosquitoes and appear to be important effectors in innate mosquito defenses against human pathogens.
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