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Neuron March 4, 2004; 41 (5): 745-54.

Identification of the components controlling inactivation of voltage-gated Ca2+ channels.

Kim J , Ghosh S , Nunziato DA , Pitt GS .

Ca(2+)-dependent inactivation (CDI) of L-type voltage-gated Ca(2+) channels limits Ca(2+) entry into neurons, thereby regulating numerous cellular events. Here we present the isolation and purification of the Ca(2+)-sensor complex, consisting of calmodulin (CaM) and part of the channel''s pore-forming alpha(1C) subunit, and demonstrate the Ca(2+)-dependent conformational shift that underlies inactivation. Dominant-negative CaM mutants that prevent CDI block the sensor''s Ca(2+)-dependent conformational change. We show how Ile1654 in the CaM binding IQ motif of alpha(1C) forms the link between the Ca(2+) sensor and the downstream inactivation machinery, using the alpha(1C) EF hand motif as a signal transducer to activate the putative pore-occluder, the alpha(1C) I-II intracellular linker.

PubMed ID: 15003174
Article link: Neuron
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