Cholesterol extraction also caused a selective modification of ion channel function, with L-type Ca2+ channel activity unchanged, but K+ channel function significantly increased due to BKCa channel activity.
KATP was also found to be S-sulfhydrated by NaHS, though the effect of this modification on channel activity was not reported.
This may also trigger the activation of second messenger systems, voltage-dependent Ca2+ and Na+ channels, post-translational modification of ion channel or receptor proteins and neuronal activation.
The broad spectrum of irritants like acrolein, isocyanates, oxidizing substances and other pollutants activate the cation channel TRPA1 by covalent modification of the channel protein [ 11, 12].
This restriction of cation flow results in slower de-doping of the channel and thus a modification of the channel current.[ 15] In contrast to the previous configuration, the gate is now located below the cell monolayer.
Evaluation of the efficiency of TRS cleavage in EGFP-KV3.4 is complicated by unknown effects of N-terminal modification on channel inactivation.
For example, in cultured Drosophila neurons, long-term removal of ICa causes a homeostatic decrease in IKCa and increase in IA, but does not appear to involve changes in channel kinetic properties, as would be expected by post-translational modifications of channels [33].
These results indicate that in addition to the stimulatory effect observed in intact cells (see Fig. 6A,D), H2O2 suppressed Kir6.2/SUR2A channel function in the cell-free condition, possibly by direct modification of the channel or some closely associated regulatory protein(s).
