SWEET转运蛋白家族的发现、结构及功能研究进展  

The Finding of SWEET Transporter Family and the Research Advance on Its Structure and Function

作　　者：孙文杰[1] 左开井[1] 

机构地区：[1]复旦-交大-诺丁汉植物技术中心上海交通大学农业与生物学院,上海200240

出　　处：《分子植物育种》2016年第4期878-885,共8页Molecular Plant Breeding

基　　金：转基因专项(2013ZX08009-003)资助

摘　　要：植物细胞间溶质转运的质外体途径是植物溶质(K^+,Na^+,糖等)转运的重要方式,该途径通常需要有溶质外排以及吸收两种转运蛋白的协同作用。其中,糖外排转运蛋白(sugars will eventually be exported transporters,SWEETs)由于能够选择性吸收不同糖底物并在植物生理活动与发育过程中发挥重要功能,近年来受到广泛关注。研究发现:植物的SWEET蛋白是具有7个跨膜结构域的转运蛋白;SWEETs蛋白在蔗糖流出叶片的过程中发挥功能,可以促进糖类物质跨过细胞膜顺浓度梯度的扩散;还可以在病原菌侵染植物过程中被微生物劫持来为其生长提供糖分;SWEETs家族蛋白还参与花蜜的分泌从而促进传粉、参与花粉发育和花粉管生长;为菌根共生体提供营养等。有关SWEETs蛋白的功能及其结构的深入研究将植物的生长发育与基础代谢有机地联系在一起。The apoplast pathway that solutes(K^+, Na^+, sugar, etc.) transport between plant cells is an important transport route through the plant, it usually needs the cooperation between the efflux and absorption transporters.The sugar efflux transporter(SWEETs Sugars Will Eventually be Exported Transporters) can selectively absorb different kinds of sugar substrate, and they play important roles in plant physiological activities and development process, so they had attracted much attention in recent years. Research has discovered that: the plant SWEET transporter protein have seven transmembrane domains; SWEETs play role in the process of sucrose outflow from leaves, and can facilitate the sugar substances diffusion across the membranes down a concentration gradient.SWEETs could also be hijacked by pathogens during their infection of plants to support their development;SWEETs also involve in the nectarial secretion that could promote pollination, they also involve in pollen development and pollen tube growth, provide symbionts for mycorrhizal, and so on. In-depth study on the function and structure of SWEETs protein will link the growth and development of plants with basal metabolism organically together.

关 键 词：糖 转运蛋白 SWEET 功能 

分 类 号：Q946[生物学—植物学]