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The tobacco aquaporin NtAQP1 is a membrane CO2 pore with physiological functions.

Uehlein, Norbert and Lovisolo, Claudio and Siefritz, Franka and Kaldenhoff, Ralf (2003):
The tobacco aquaporin NtAQP1 is a membrane CO2 pore with physiological functions.
In: Nature, pp. 734-7, 425, (6959), ISSN 1476-4687, [Article]

Abstract

Aquaporins, found in virtually all living organisms, are membrane-intrinsic proteins that form water-permeable complexes. The mammalian aquaporin AQP1 has also shown CO2 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 CO2 permeability comparable to that of the human AQP1 is observed for the tobacco plasma membrane aquaporin NtAQP1. NtAQP1 facilitates CO2 membrane transport in the homologous plant system at the cellular level, and has a significant function in photosynthesis and in stomatal opening. NtAQP1 overexpression heightens membrane permeability for CO2 and water, and increases leaf growth. The results indicate that NtAQP1-related CO2 permeability is of physiological importance under conditions where the CO2 gradient across a membrane is small, as is the case between the atmosphere and the inside of a plant cell.

Item Type: Article
Erschienen: 2003
Creators: Uehlein, Norbert and Lovisolo, Claudio and Siefritz, Franka and Kaldenhoff, Ralf
Title: The tobacco aquaporin NtAQP1 is a membrane CO2 pore with physiological functions.
Language: English
Abstract:

Aquaporins, found in virtually all living organisms, are membrane-intrinsic proteins that form water-permeable complexes. The mammalian aquaporin AQP1 has also shown CO2 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 CO2 permeability comparable to that of the human AQP1 is observed for the tobacco plasma membrane aquaporin NtAQP1. NtAQP1 facilitates CO2 membrane transport in the homologous plant system at the cellular level, and has a significant function in photosynthesis and in stomatal opening. NtAQP1 overexpression heightens membrane permeability for CO2 and water, and increases leaf growth. The results indicate that NtAQP1-related CO2 permeability is of physiological importance under conditions where the CO2 gradient across a membrane is small, as is the case between the atmosphere and the inside of a plant cell.

Journal or Publication Title: Nature
Volume: 425
Number: 6959
Divisions: 10 Department of Biology > Applied Plant Sciences
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10 Department of Biology
Date Deposited: 31 Aug 2011 12:39
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