Counter ion movement during Ca2+ release

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Although counterion movement coupled with Ca2+ release/uptake is probably required for physiologically functioning of intracellular Ca2+ stores, the molecular basis is totally unknown. We recently identified TRIC channels, that likely mediate counter-K+ currents facilitating Ca2+ release. However, TRIC-knockout mice strongly suggest the existence of other channels/transporters mediating counter currents. We attempted to find new candidates for such channels/transporters in this project, and identified Tmem52 and mitsugumin 56 from the muscle sarcoplasmic reticulum.