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2017 ; 250
(6
): 629-639
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Quantification of the Intracellular Life Time of Water Molecules to Measure
Transport Rates of Human Aquaglyceroporins
#MMPMID28914342
Palmgren M
; Hernebring M
; Eriksson S
; Elbing K
; Geijer C
; Lasi? S
; Dahl P
; Hansen JS
; Topgaard D
; Lindkvist-Petersson K
J Membr Biol
2017[Dec]; 250
(6
): 629-639
PMID28914342
show ga
Orthodox aquaporins are transmembrane channel proteins that facilitate rapid
diffusion of water, while aquaglyceroporins facilitate the diffusion of small
uncharged molecules such as glycerol and arsenic trioxide. Aquaglyceroporins play
important roles in human physiology, in particular for glycerol metabolism and
arsenic detoxification. We have developed a unique system applying the strain of
the yeast Pichia pastoris, where the endogenous aquaporins/aquaglyceroporins have
been removed and human aquaglyceroporins AQP3, AQP7, and AQP9 are recombinantly
expressed enabling comparative permeability measurements between the expressed
proteins. Using a newly established Nuclear Magnetic Resonance approach based on
measurement of the intracellular life time of water, we propose that human
aquaglyceroporins are poor facilitators of water and that the water transport
efficiency is similar to that of passive diffusion across native cell membranes.
This is distinctly different from glycerol and arsenic trioxide, where high
glycerol transport efficiency was recorded.