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甘薯蔗糖转运蛋白ibsut1x在酵母细胞中的定位

DOI: 10.3724/SP.J.1145.2010.00798, PP. 798-802

Keywords: 甘薯,蔗糖转运蛋白,基因表达,定位,绿色荧光蛋白,酿酒酵母

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Abstract:

蔗糖转运蛋白是植物特有的一类载体蛋白,酿酒酵母突变株susy7/ura3常被利用来研究蔗糖转运蛋白的功能,但在研究中发现,有的蔗糖转运蛋白在酵母中未表现出蔗糖转运的功能.但这或许并不是其实际功能的体现,而是由于这类蛋白无法准确定位到酵母的细胞膜上造成的.ibsut1x是本实验室从甘薯中分离到的一个蔗糖转运蛋白基因,但是在susy7/ura3中未表现出明显的蔗糖转运功能.本研究通过用激光共聚焦显微镜对ibsut1x与绿色荧光蛋白(greenfluorescentprotein,gfp)的融合蛋白的表达和定位的观察,发现ibsut1x不仅在酵母细胞中有表达,而且表达的蛋白质定位在酵母的细胞膜上.结果表明,ibsut1x在酵母细胞中不能转运蔗糖,该蛋白很可能不具有蔗糖转运功能,或者其与蔗糖的亲和力很低.图4表1参21

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