Tonoplast (BvTIP1;2) and plasma membrane (BvPIP2;1) aquaporins show different mechanosensitive properties.

Ramiro P Goldman, Cintia Jozefkowicz, Agustina Canessa Fortuna, Moira Sutka, Karina Alleva, Marcelo Ozu

FEBS letters 2017 Jun

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Previous works proposed that aquaporins behave as mechanosensitive channels. However, principal issues about mechanosensitivity of aquaporins are not known. In this work, we characterized the mechanosensitive properties of the water channels BvTIP1;2 (TIP1) and BvPIP2;1 (PIP2) from red beet (Beta vulgaris). We simultaneously measured the mechanical behavior and the water transport rates during the osmotic response of emptied-out oocytes expressing TIP1 or PIP2. Our results indicate that TIP1 is a mechanosensitive aquaporin, whereas PIP2 is not. We found that a single exponential function between the osmotic permeability coefficient and the volumetric elastic modulus governs the mechanosensitivity of TIP1. Finally, homology modeling analysis indicates that putative residues involved in mechanosensitivity show different quantity and distribution in TIP1 and PIP2. © 2017 Federation of European Biochemical Societies.

Citation

Ramiro P Goldman, Cintia Jozefkowicz, Agustina Canessa Fortuna, Moira Sutka, Karina Alleva, Marcelo Ozu. Tonoplast (BvTIP1;2) and plasma membrane (BvPIP2;1) aquaporins show different mechanosensitive properties. FEBS letters. 2017 Jun;591(11):1555-1565