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首页> 外文期刊>Nature >The tobacco aquaporin NtAQP1 is a membrane CO_2 pore with physiological functions
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The tobacco aquaporin NtAQP1 is a membrane CO_2 pore with physiological functions

机译：烟草水通道蛋白NtAQP1是具有生理功能的膜CO_2孔

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Aquaporins, found in virtually all living organisms, are membrane-intrinsic proteins that form water-permeable complexes. The mammalian aquaporin AQP1 has also shown CO_2 permeability when expressed heterologously in Xenopus oocytes, although whether this is a biochemical curiosity or of physiological significance is a matter of debate. Here we report that, in the same expression system, a CO_2 permeability comparable to that of the human AQP1 is observed for the tobacco plasma membrane aquaporin NtAQPI. NtAQPI facilitates CO_2 membrane transport in the homologous plant system at the cellular level, and has a significant function in photosynthesis and in stomatal opening. NtAQPI overexpression heightens membrane permeability for CO_2 and water, and increases leaf growth. The results indicate that NtAQPl-related CO_2 permeability is of physiological importance under conditions where the CO_2 gradient across a membrane is small, as is the case between the atmosphere and the inside of a plant cell.
机译：实际上在所有活生物体中都存在的水通道蛋白是形成水可渗透复合物的膜内在蛋白。当在非洲爪蟾卵母细胞中异源表达时，哺乳动物水通道蛋白AQP1也显示出CO_2渗透性，尽管这是生化好奇还是具有生理意义尚有争议。在这里，我们报告说，在相同的表达系统中，对于烟草质膜水通道蛋白NtAQPI，可观察到与人AQP1相当的CO_2渗透性。 NtAQPI在细胞水平上促进同源植物系统中CO_2膜的运输，并在光合作用和气孔开放中起重要作用。 NtAQPI过表达增加了CO_2和水的膜通透性，并增加了叶片的生长。结果表明，NtAQP1相关的CO_2渗透性在跨膜的CO_2梯度较小的条件下（如大气与植物细胞内部之间的情况）具有生理重要性。

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