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2014 ; 15
(5
): 7513-36
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gab.com Text
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English Wikipedia
The oligomycin-sensitivity conferring protein of mitochondrial ATP synthase:
emerging new roles in mitochondrial pathophysiology
#MMPMID24786291
Antoniel M
; Giorgio V
; Fogolari F
; Glick GD
; Bernardi P
; Lippe G
Int J Mol Sci
2014[Apr]; 15
(5
): 7513-36
PMID24786291
show ga
The oligomycin-sensitivity conferring protein (OSCP) of the mitochondrial F(O)F1
ATP synthase has long been recognized to be essential for the coupling of proton
transport to ATP synthesis. Located on top of the catalytic F1 sector, it makes
stable contacts with both F1 and the peripheral stalk, ensuring the structural
and functional coupling between F(O) and F1, which is disrupted by the
antibiotic, oligomycin. Recent data have established that OSCP is the binding
target of cyclophilin (CyP) D, a well-characterized inducer of the mitochondrial
permeability transition pore (PTP), whose opening can precipitate cell death.
CyPD binding affects ATP synthase activity, and most importantly, it decreases
the threshold matrix CaČ? required for PTP opening, in striking analogy with
benzodiazepine 423, an apoptosis-inducing agent that also binds OSCP. These
findings are consistent with the demonstration that dimers of ATP synthase
generate CaČ?-dependent currents with features indistinguishable from those of
the PTP and suggest that ATP synthase is directly involved in PTP formation,
although the underlying mechanism remains to be established. In this scenario,
OSCP appears to play a fundamental role, sensing the signal(s) that switches the
enzyme of life in a channel able to precipitate cell death.