先前，我們實驗室的研究結果已指出，Galectin-1 (GAL1) 是一個幾丁質結合蛋白，而且對小菜蛾具有殺蟲活性。在本篇研究中，將倉鼠卵巢細胞的GAL1基因序列，建構在pαHY300、pCAMBIA1390-35S和pBac-IR-GFP的表現載體上，並將載體分別命名為pαHY300-GAL1、p1390-35S-GAL和pBac-GAL1-IR-GFP，並且將他們分別送入枯草桿菌、阿拉伯芥和加洲苜蓿夜蛾核多角體病毒中，製成GAL1轉殖株，進行GAL1蛋白質的表現及其殺蟲活性的研究。而結果指出GAL1基因確實成功地送入枯草桿菌、阿拉伯芥和核多角體病毒中，並且都會表現GAL1蛋白質，在GAL1蛋白質表現量方面，阿拉伯芥和核多角體病毒遠高於枯草桿菌，在殺蟲活性的結果中，枯草桿菌GAL1轉殖株對小菜蛾及斜紋夜盜沒有明顯的殺蟲活性，而阿拉伯芥GAL1轉殖株對小菜蛾及斜紋夜盜則有明顯的殺蟲活性，核多角體病毒GAL1轉殖株的殺蟲活性，仍在進行當中。而以上的結果指出，以GAL1蛋白質做為新型的具有殺蟲活性的轉殖植物是一個很好的選擇。 Previous studies in our laboratory have indicated that galectin-1 (GAL1) is a chitin binding protein and shows insecticidal activity toward Plutella xylostella. In these studies, GAL1 gene from Chinese hamster ovary cells was cloned into the plasmids pαHY300, pCAMBIA1390-35S and pBac-IR-GFP respectively. The resulting plasmids were designed as pαHY300-GAL1, p1390-35s-GAL1 and AcMNPV-GAL1 and introduced into Bacillus subtilis, Arabidopsis thaliana and Autographa californica multiple nucleopolyhedrovirus respectively for GAL1 expression and insecticidal activity investigation. The results showed that GAL1 gene was successfully introduced into B. subtilis, A. thaliana and AcMNPV for protein expression. The expression levels of GAL1 were highest in A. thaliana among the transformants. Though the GAL1-transgenic B. subtilis showed no significant insecticidal activity to S. litura and P. xylostella, GAL1-transgenic A. thaliana showed high insecticidal activity toward Spodoptera litura and Plutella xylostella. The insecticidal activities of GAL1-transfected AcMNPV will be under investigation. The results indicate that GAL1 would be a future candidate gene in transgenic plants.
