Related Experiment Video
Updated: Aug 19, 2026

Yeast Luminometric and Xenopus Oocyte Electrophysiological Examinations of the Molecular Mechanosensitivity of TRPV4
Published on: December 31, 2013
Inactivation of the peptide-sensitive channel from the yeast mitochondrial outer membrane: properties, sensitivity to
M Pelleschi1, J P Henry, M Thieffry
1Service de Neurobiologie Physico-Chimique, Institut de Biologie Physico-Chimique, Paris, France.
Abstract:
The yeast Peptide Sensitive Channel (PSC), a cationic channel of the mitochondrial outer membrane closes with slow kinetics at potentials of either polarity. The properties of this inactivation closely resemble those of the Voltage-Dependent Anion Channel (VDAC) slow kinetics closures. Addition of trypsin to one compartment suppresses the inactivation observed when this compartment is made positive, but does not affect the inactivation observed at potentials of reverse polarity. Both sides of the channel are sensitive. The reduced form of the Mast Cell Degranulating peptide (rMCD) increases the rate of inactivation, but only when the polarity of the compartment to which it is added is positive. The effect is not reversed by washing the peptide out, but is suppressed by trypsin. The peptide can bind to both sides of the membrane. The effect of rMCD on PSC closely resembles that of the "modulator" on VDAC. The similarities between PSC and VDAC suggest that the former might be a cationic porin of the mitochondrial outer membrane possessing a structure closely related to that of VDAC.
Related Concept Videos
Mitochondrial Precursor Proteins
Most of the mitochondrial precursors...
Translocation of Proteins into the Mitochondria
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Energy to Drive Translocation
Generally, polypeptides are unfolded by two distinct...
Protein Transport into the Inner Mitochondrial Membrane
Transport of mitochondrial precursors across the TIM23 channel is driven by...

