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- W2008287839 abstract "1. The role of the sequence 1572-1651 in the C-terminal tail of the alpha1C subunit in run-down of Ca2+ channels was studied by comparing functional properties of the conventional alpha1C,77 channel with those of three isoforms carrying alterations in this motif. 2. The pore-forming alpha1C subunits were co-expressed with alpha2delta and beta2a subunits in HEK-tsA201 cells, a subclone of the human embryonic kidney cell line, and studied by whole-cell and single-channel patch-clamp techniques. 3. Replacement of amino acids 1572-1651 in alpha1C,77 with 81 different amino acids leading to alpha1C,86 significantly altered run-down behaviour. Run-down of Ba2+ currents was rapid with alpha1C,77 channels, but was slow with alpha1C,86. 4. Transfer of the alpha1C,86 segments L (amino acids 1572-1598) or K (amino acids 1595-1652) into the alpha1C,77 channel yielded alpha1C,77L and alpha1C,77K channels, respectively, the run-down of which resembled more that of alpha1C,77. These results demonstrate that a large stretch of sequence between residues 1572 and 1652 of alpha1C,86 renders Ca2+ channels markedly resistant to run-down. 5. The protease inhibitor calpastatin added together with ATP was able to reverse the run-down of alpha1C,77 channels. Calpastatin expression was demonstrated in the HEK-tsA cells by Western blot analysis. 6. These results indicate a significant role of the C-terminal sequence 1572-1651 of the alpha1C subunit in run-down of L-type Ca2+ channels and suggest this sequence as a target site for a modulatory effect by endogenous calpastatin." @default.
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- W2008287839 date "2000-11-01" @default.
- W2008287839 modified "2023-09-26" @default.
- W2008287839 title "Molecular determinant for run‐down of L‐type Ca<sup>2+</sup>channels localized in the carboxyl terminus of the α<sub>1C</sub>subunit" @default.
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- W2008287839 doi "https://doi.org/10.1111/j.1469-7793.2000.00119.x" @default.
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