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Structural and functional analysis of domain ?¢???¢ of cry1ie toxin

机译:晶体毒素结构域和结构的功能分析

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Cry toxins are insecticidal proteins encoded by cry gene in Bacillus thuringiensis. Cry1I gene is silent in Bt, but can be over expressed as Cry1Ie toxin protein in E.coli. Its active fragment, IE648, can bind with insect peritrophic membrane, which is an important barrier that Cry toxin must pass through before binding with midgut epithelium. Research of our team indicated that domain a??¢ of Cry1Ie seems to take a part in the interaction. In this study structural features of domain a??¢ protein has been analyzed, its function was predicted. It has a a-sandwich structure composed of two bundles of antiparallel a sheets, structurally resemble the carbonhydrate binding proteins, may play a role in binding with polysaccharide like chitin of peritrophic membrane.
机译:Cry毒素是苏云金芽胞杆菌中cry基因编码的杀虫蛋白。 Cry1I基因在Bt中是沉默的,但在大肠杆菌中可以作为Cry1Ie毒素蛋白高表达。它的活性片段IE648可以与昆虫的营养膜结合,这是Cry毒素与中肠上皮结合之前必须通过的重要屏障。我们小组的研究表明,Cry1Ie的a ?? ¢域似乎参与了相互作用。在这项研究中,分析了结构域αβ1蛋白的结构特征,并预测了其功能。它具有由两束反平行的a片组成的a三明治结构,在结构上类似于碳水合物结合蛋白,可能在与诸如营养膜的几丁质的多糖结合中发挥作用。

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