Leureptin: a soluble, extracellular leucine-rich repeat protein from Manduca sexta that binds lipopolysaccharide.

Leureptin: a soluble, extracellular leucine-rich repeat protein from Manduca sexta that binds lipopolysaccharide.
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DOI:
10.1016/j.ibmb.2010.07.002
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发表时间:
2010-10
影响因子:
3.8
通讯作者:
Kanost, Michael R.
Kanost, Michael R.
中科院分区:
农林科学2区
文献类型:
--
作者:
Zhu, Yifei;Ragan, Emily J.;Kanost, Michael R.

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富含亮氨酸重复序列的蛋白质在许多方面参与免疫应答。在昆虫中,这些包括Toll样受体和冈比亚按蚊蛋白APL1和LRIM1。在这里,我们描述了leureptin,一种新的细胞外蛋白与13个亮氨酸丰富的重复从昆虫天蛾血淋巴的鉴定和表征。注射细菌后,脂肪体中的leureptin mRNA水平增加,但血浆中的蛋白质水平降低,表明leureptin在免疫应答期间被消耗。Leureptin与细菌脂多糖(LPS)结合。使用leureptin抗血清的显微镜检查显示,leureptin与注射细菌后的血细胞相关,表明leureptin参与血细胞对细菌感染的反应。序列数据库搜索表明类似的蛋白质存在于其他鳞翅目物种中。
Leucine-rich repeat containing proteins are involved in immune response in many capacities. In insects, these include Toll-like receptors and the Anopheles gambiae proteins APL1 and LRIM1. Here we describe the identification and characterization of leureptin, a novel extracellular protein with 13 leucine-rich repeats from hemolymph of the insect Manduca sexta. After injection of bacteria, leureptin mRNA level increased in fat body, but protein levels in plasma decreased, an indication that leureptin is consumed during the immune response. Leureptin bound to bacterial lipopolysaccharide (LPS). Microscopy using leureptin antiserum showed that leureptin associates with hemocytes after injection of bacteria, an indication that leureptin is involved in hemocyte responses to bacterial infection. Sequence database searches suggest similar proteins are present in other Lepidopteran species.
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