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The CRAC channel activator STIM1 binds and inhibits L-type voltage-gated calcium channels.

Science (New York, N.Y.) | October 07, 2010 |

Park, Chan Young | Shcheglovitov, Aleksandr | Dolmetsch, Ricardo
Park, Chan Young, Shcheglovitov, Aleksandr, and Dolmetsch, Ricardo. "The CRAC channel activator STIM1 binds and inhibits L-type voltage-gated calcium channels." Science (New York, N.Y.) 330.6000 (2010): 101-5. Web.

Abstract

Voltage- and store-operated calcium (Ca(2+)) channels are the major routes of Ca(2+) entry in mammalian cells, but little is known about how cells coor ... lishes a previously unknown function for STIM1 and provides a molecular mechanism to explain the reciprocal regulation of these two channels in cells.

Voltage- and store-operated calcium (Ca(2+)) channels are the major routes of Ca(2+) entry in mammalian cells, but little is known about how cells coordinate the activity of these channels to generate coherent calcium signals. We found that STIM1 (stromal interaction molecule 1), the main activator of store-operated Ca(2+) channels, directly suppresses depolarization-induced opening of the voltage-gated Ca(2+) channel Ca(V)1.2. STIM1 binds to the C terminus of Ca(V)1.2 through its Ca(2+) release-activated Ca(2+) activation domain, acutely inhibits gating, and causes long-term internalization of the channel from the membrane. This establishes a previously unknown function for STIM1 and provides a molecular mechanism to explain the reciprocal regulation of these two channels in cells.