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J Neurosci
2005 Feb 02;255:1037-49. doi: 10.1523/JNEUROSCI.4554-04.2005.
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Association of CaV1.3 L-type calcium channels with Shank.
Zhang H
,
Maximov A
,
Fu Y
,
Xu F
,
Tang TS
,
Tkatch T
,
Surmeier DJ
,
Bezprozvanny I
.
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Neurons express multiple types of voltage-gated calcium (Ca2+) channels. Two subtypes of neuronal L-type Ca2+ channels are encoded by CaV1.2 and CaV1.3 pore-forming subunits. Both CaV1.2 and CaV1.3 subunits contain class I PDZ (postsynaptic density-95/Discs large/zona occludens-1) domain-binding consensus at their C termini. In yeast two-hybrid screen of rat brain cDNA library with the C-terminal bait of CaV1.3a (long C-terminal splice variant) L-type Ca2+ channel subunit, we isolated multiple clones of postsynaptic adaptor protein Shank. We demonstrated a specific association of CaV1.3a C termini, but not of CaV1.2 C termini, with Shank PDZ domain in vitro. We further demonstrated that the proline-rich region present in C termini of CaV1.3a subunit binds to Shank Src homology 3 domain. We established that CaV1.3a and Shank localized to postsynaptic locations in cultured rat hippocampal neurons. By expressing epitope-tagged recombinant CaV1.3 subunits in rat hippocampal neuronal cultures, we demonstrated that the presence of Shank-binding motifs in CaV1.3a sequence is both necessary and sufficient for synaptic clustering of CaV1.3 L-type Ca2+ channels. In experiments with dominant-negative peptides and dihydropyridine-resistant CaV1.3a mutants, we demonstrated an importance of Shank-binding motif in CaV1.3a sequence for phosphorylated cAMP response element-binding protein (pCREB) signaling in cultured hippocampal neurons. Our results directly link CaV1.3 neuronal L-type Ca2+ channels to macromolecular signaling complex formed by Shank and other modular adaptor proteins at postsynaptic density and provide novel information about the role played by CaV1.3 L-type Ca2+ channels in pCREB signaling.
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