Sugar transporters for intercellular exchange and nutrition of pathogens.

Sugar transporters for intercellular exchange and nutrition of pathogens.
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DOI:
10.1038/nature09606
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发表时间:
2010-11-25
期刊:
影响因子:
64.8
通讯作者:
Frommer, Wolf B.
Frommer, Wolf B.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Chen, Li-Qing;Hou, Bi-Huei;Lalonde, Sylvie;Takanaga, Hitomi;Hartung, Mara L.;Qu, Xiao-Qing;Guo, Woei-Jiun;Kim, Jung-Gun;Underwood, William;Chaudhuri, Bhavna;Chermak, Diane;Antony, Ginny;White, Frank F.;Somerville, Shauna C.;Mudgett, Mary Beth;Frommer, Wolf B.

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糖外排转运体是维持动物血糖水平、植物花蜜生产、植物种子和花粉发育所必需的。尽管糖外流转运蛋白具有广泛的生物学意义,但它的特性仍然难以捉摸。利用光学葡萄糖传感器,我们鉴定了一类新的糖转运蛋白,命名为Smots,并表明在17个拟南芥中至少有6个,在线虫中20多个水稻中有2个,在7个同源物中有2个,以及单一拷贝的人类蛋白,介导葡萄糖的运输。拟南芥SWEET8对花粉活力是必需的,而水稻同系物SWEET11和SWEET14是细菌通过直接与甜味启动子结合的方式利用细菌病原菌的毒力。细菌共生体、真菌和细菌诱导不同甜味基因的表达,表明甜味转运体的糖外排功能可能是病原菌和共生体为获取营养而进行的靶标。后生动物的同系物可能参与了肠道、肝脏、附睾腺和乳腺细胞的糖外流。
Sugar efflux transporters are essential for the maintenance of animal blood glucose levels, plant nectar production, and plant seed and pollen development. Despite broad biological importance, the identity of sugar efflux transporters has remained elusive. Using optical glucose sensors, we identified a new class of sugar transporters, named SWEETs, and show that at least six out of seventeen Arabidopsis, two out of over twenty rice and two out of seven homologues in Caenorhabditis elegans, and the single copy human protein, mediate glucose transport. Arabidopsis SWEET8 is essential for pollen viability, and the rice homologues SWEET11 and SWEET14 are specifically exploited by bacterial pathogens for virulence by means of direct binding of a bacterial effector to the SWEET promoter. Bacterial symbionts and fungal and bacterial pathogens induce the expression of different SWEET genes, indicating that the sugar efflux function of SWEET transporters is probably targeted by pathogens and symbionts for nutritional gain. The metazoan homologues may be involved in sugar efflux from intestinal, liver, epididymis and mammary cells.
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