Abstract
The plant plasma membrane barrier can express aquaporins (PIP1 and PIP2) that show two intriguing aspects: (1) the potential of modulating whole membrane water permeability by co-expression of both types, which have recently been distinguished for showing a different capacity to reach the plasma membrane; and (2) the faculty to reduce water permeation through the pore after cytosolic acidification, as a consequence of a gating process. Our working hypothesis is that these two key features might enhance plasticity of the membrane water transport capacity if they jointly trigger any cooperative interaction. In previous work, we proved by biophysical approaches that the plasma membrane of the halophyte Beta vulgaris storage root presents highly permeable aquaporins that can be shut down by acidic pH. Root Beta vulgaris PIPs were therefore subcloned and expressed in Xenopus oocytes. Co-expression of BvPIP1;1 and BvPIP2;2 not only enhances oocyte plasma membrane water permeability synergistically but also reinforces pH inhibitory response from partial to complete shut down after cytosolic pH acidification. This pH dependent behavior shows that PIP1–PIP2 co-expression accounts for a different pH sensitivity in comparison with PIP2 expression. These results prove for the first time that PIP co-expression modulates the membrane water permeability through a pH regulatory response, enhancing in this way membrane versatility to adjust its water transfer capacity.
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Abbreviations
- AQP:
-
Aquaporin
- P f :
-
Osmotic water permeability
- PIP:
-
Plasma membrane intrinsic protein (aquaporin)
- PM:
-
Plasma membrane
- ARCA:
-
Anti-reverse cap analog
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Acknowledgments
Our particular thanks are due to Noel Danjou who improved AMCAP program (version 9.20; http://noeld.com/programs.asp?cat=video#AMCap) to allow acquisition of still images as requested; Alex Paladini (INGEBI, CONICET) who designed and provided us with built-in chambers for oocyte experiments; Christophe Maurel (INRA, France) for kindly providing us with AtPIP2;2 (wild type and the H197D mutant); Mark Daniels (UCSD, USA) for the kindly gift of AtPIP2;3 cDNA; Victoria Espelt and Cora Alvarez for their invaluable contribution with the fluorimetric measurements and Alejandro C. Paladini for helpful comments in the ms. This work was financed by the PRESTAMO BID PICT04 949, UBACyT0810 and CONICET PIP5154, grants to GA and PRESTAMO BID PICT06 01804 grant to KA. KA and GA are Career Research Members of CONICET.
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Bellati, J., Alleva, K., Soto, G. et al. Intracellular pH sensing is altered by plasma membrane PIP aquaporin co-expression. Plant Mol Biol 74, 105–118 (2010). https://doi.org/10.1007/s11103-010-9658-8
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DOI: https://doi.org/10.1007/s11103-010-9658-8