A study using various simulation techniques to examine the NO permeability of brain AQP4 suggested that the central pore formed by the association of the four monomers in a tetramer presents a lower barrier to NO gas permeation than pure lipid bilayers (Wang and Tajkhorshid2010). The authors suggested that the central pore of AQP4 tetramer may act as a reservoir for NOmessenger molecules, but doubted that AQP4 plays a physiological role in transmembrane NO transport, except in membranes with a low intrinsic gas permeability or when AQPs occupy a large portion of the membrane surface.
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