• TPC's

    Current-voltage relations of TPCN2 currents from single lysosomes in the presence of NAADP, measured on the Port-a-Patch.

    Schieder et al. (2010)

TPC1 / TPC2 | Two Pore Segment Channel 1 and 2

Two Pore Segment Channels

2 members: TPC1, TPC2

The channel protein contains two repeats (domains I and II). Each of the two repeats contains five hydrophobic transmembrane segments (S1, S2, S3, S5, S6) and one positively charged transmembrane segment (S4). TPCs are formed by two transmembrane non-equivalent tandem Shaker-like pore-forming subunits, dimerized to form quasi-tetramers.

Regulation and function:
Activation of TPCs is induced by a decrease in transmembrane potential, or by an increase in calcium concentrations in the cytosol. Low pH of the lumen and low calcium concentration could cause inhibition of these channels. Expression of TPCs are found in both plant vacuoles and animal acidic organelles (endosomes and lysosomes). TPCs regulate sodium and calcium ion conductance, intravesicular pH, and trafficking excitability.


2014 - High susceptibility to fatty liver disease in two-pore channel 2-deficient mice

icon pap  Port-a-Patch publication in Nature Communications (2014)

Grimm C., Holdt L.M., Chen C.C., Hassan S., Müller C., Jörs S., Cuny H., Kissing S., Schröder B., Butz B., Northoff B., Castonguay J., Luber C.A., Moser M., Spahn S., Lüllmann-Rauch R., Fendel C., Klugbauer N., Griesbeck O., Haas A., Mann M., Bracher F., Teupser D., Saftig P., Biel M., Wahl-Schott C.

2010 - Planar Patch Clamp Approach to Characterize Ionic Currents from Intact Lysosomes

icon pap  Port-a-Patch publication in Science Signaling (2010)

Schieder M., Rötzer K., Brüggemann A., Biel M., Wahl-Schott C.

2010 - Characterization of two pore channel 2 (TPCN2) -mediated Ca2+ currents in isolated lysosomes

icon pap  Port-a-Patch publication in The Journal of Biological Chemistry (2010)

Schieder M., Rötzer K., Brüggemann A., Biel M., Wahl-Schott C.A.

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