The expression and crystallization of Cry65Aa require two C-termini, revealing a novel evolutionary strategy of Bacillus thuringiensis Cry proteins.

The expression and crystallization of Cry65Aa require two C-termini, revealing a novel evolutionary strategy of Bacillus thuringiensis Cry proteins.
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Cry65Aa的表达和结晶需要两个C端,揭示了苏云金芽孢杆菌Cry蛋白的一种新的进化策略

DOI:
10.1038/srep08291
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发表时间:
2015-02-06
期刊:
影响因子:
4.6
通讯作者:
Sun M
Sun M
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Peng DH;Pang CY;Wu H;Huang Q;Zheng JS;Sun M

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苏云金芽孢杆菌杀虫晶体蛋白(Cry)基因是培育抗虫转基因作物的关键基因资源。然而,许多CRY基因不能在母细胞中表达或形成晶体。在这里,我们报告了一个新的Cry蛋白基因,Cry65Aa1,它存在于一个操纵子中,该操纵子包含一个编码假想蛋白ORF2的下游基因。我们证明了ORF2是Cry65Aa1表达和结晶所必需的,它作为C-末端的结晶域。ORF2序列也是Cry65Aa表达所必需的,因为ORF2转录本对Cry65Aa1转录本具有稳定作用。此外,我们还发现,Cry65Aa1的结晶除了需要ORF2或典型的Cry蛋白C末端区域外,还需要Cry65Aa1的C末端。最后,我们发现Cry65Aa1对MDA-MB231癌细胞具有选择性细胞毒作用。这份报告是第一次描述一个130 kDa的质量范围的Cry蛋白,需要两个C-末端来结晶。我们的发现揭示了一种新的Cry蛋白的进化策略,并为苏云金芽孢杆菌中存在不能形成晶体的Cry蛋白基因提供了解释。本研究还为从“无晶体”苏云金芽孢杆菌菌株中分离新的基因提供了一个潜在的框架。
The insecticidal crystal protein (Cry) genes of Bacillus thuringiensis are a key gene resource for generating transgenic crops with pest resistance. However, many cry genes cannot be expressed or form crystals in mother cells. Here, we report a novel Cry protein gene, cry65Aa1, which exists in an operon that contains a downstream gene encoding a hypothetical protein ORF2. We demonstrated that ORF2 is required for Cry65Aa1 expression and crystallization by function as a C-terminal crystallization domain. The orf2 sequence is also required for Cry65Aa expression, because orf2 transcripts have a stabilizing effect on cry65Aa1 transcripts. Furthermore, we found that the crystallization of Cry65Aa1 required the Cry65Aa1 C-terminus in addition to ORF2 or a typical Cry protein C-terminal region. Finally, we showed that Cry65Aa1 has a selective cytotoxic effect on MDA-MB231 cancer cells. This report is the first description of a 130-kDa mass range Cry protein requiring two C-termini for crystallization. Our findings reveal a novel evolutionary strategy of Cry proteins and provide an explanation for the existence of Cry protein genes that cannot form crystals in B. thuringiensis. This study also provides a potential framework for isolating novel cry genes from “no crystal” B. thuringiensis strains.
DOI: 10.1603/029.102.0601
发表时间: 2009-12-01
影响因子: 2.2
作者:
Tabashnik, Bruce E.;Van Rensburg, J. B. J.;Carriere, Yves
通讯作者: Carriere, Yves
DOI: 10.1128/cdli.7.4.625-634.2000
发表时间: 2000-07-01
期刊: CLINICAL AND DIAGNOSTIC LABORATORY IMMUNOLOGY
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发表时间: 1993-04-01
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发表时间: 1994-07-01
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发表时间: 2009-06-01
影响因子: 4
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