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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Physiol
2015 ; 593
(18
): 4139-50
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A tale of two CLCs: biophysical insights toward understanding ClC-5 and ClC-7
function in endosomes and lysosomes
#MMPMID26036722
Zifarelli G
J Physiol
2015[Sep]; 593
(18
): 4139-50
PMID26036722
show ga
The CLC protein family comprises both Cl(-) channels and H(+) -coupled anion
transporters. The understanding of the critical role of CLC proteins in a number
of physiological functions has greatly contributed to a revision of the classical
paradigm that attributed to Cl(-) ions only a marginal role in human physiology.
The endosomal ClC-5 and the lysosomal ClC-7 are the best characterized human CLC
transporters. Their dysfunction causes Dent's disease and osteopetrosis,
respectively. It had been originally proposed that they would provide a Cl(-)
shunt conductance allowing efficient acidification of intracellular compartments.
However, this model seems to conflict with the transport properties of these
proteins and with recent physiological evidence. Currently, there is no consensus
on their specific physiological role. CLC proteins present also a number of
peculiar biophysical properties, such as the dimeric architecture, the
co-existence of intrinsically different thermodynamic modes of transport based on
similar structural principles, and the gating mechanism recently emerging for the
transporters, just to name a few. This review focuses on the biophysical
properties and physiological roles of ClC-5 and ClC-7.