Two-pore channels form homo- and heterodimers.
Two-pore channels (TPCs) have been recently identified as NAADP-regulated Ca(2+) release channels, which are localized on the endolysosomal system. TPCs have a 12-transmembrane domain (TMD) structure and are evolutionary intermediates between the 24-TMD α-subunits of Na(+) or Ca(2+) channels and the transient receptor potential channel superfamily, which have six TMDs in a single subunit and form tetramers with 24 TMDs as active channels. Based on this relationship, it is predicted that TPCs ...Expand abstract
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