Essential Ca2+-binding motif for Ca2+-sensitive inactivation of L-type Ca2+ channels

Marita De Leon, Yan Wang, Lisa Jones, Edward Perez-Reyes, Xiangyang Wei, Tuck Wah Soong, Terry P. Snutch, David T. Yue

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234 Scopus citations


Intracellular calcium (Ca2+) inhibits the opening of L-type (α1C) Ca2+ channels, providing physiological control of Ca2+ entry into a wide variety of cells. A structural determinant of this Ca2+-sensitive inactivation was revealed by chimeric Ca2+ channels derived from parental α1C and α1E channels, the latter of which is a neuronal channel lacking Ca2+ inactivation. A consensus Ca2+-binding motif (an EF hand), located on the α1C subunit, was required for Ca2+ inactivation. Donation of the α1C EF-hand region to the α1E channel conferred the Ca2+-inactivating phenotype. These results strongly suggest that Ca2+ binding to the α1C subunit initiates Ca2+ inactivation.

Original languageEnglish (US)
Pages (from-to)1502-1506
Number of pages5
Issue number5241
StatePublished - Dec 1 1995
Externally publishedYes

ASJC Scopus subject areas

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