Engineered calmodulins reveal the unexpected eminence of Ca2+ channel inactivation in controlling heart excitation

Badr A. Alseikhan, Carla D. DeMaria, Henry M. Colecraft, David T. Yue

Research output: Contribution to journalArticlepeer-review

152 Scopus citations

Abstract

Engineered calmodulins (CaMs), rendered Ca2+-insensitive by mutations, function as dominant negatives in heterologous systems, and have revealed mechanisms of ion channel modulation by Ca2+/CaM. The use of these CaMs in native mammalian cells now emerges as a strategy to unmask the biology of such Ca2+ feedback. Here, we developed recombinant adenoviruses bearing engineered CaMs to facilitate their expression in adult heart cells, where Ca2+ regulation may be essential for moment-to-moment control of the heartbeat. Engineered CaMs not only eliminated the Ca2+-dependent inactivation of native calcium channels, but exposed an unexpectedly large impact of removing such feedback: the unprecedented (4- to 5-fold) prolongation of action potentials. This striking result recasts the basic paradigm for action-potential control and illustrates the promise of virally delivered engineered CaM to investigate the biology of numerous other CaM-signaling pathways.

Original languageEnglish (US)
Pages (from-to)17185-17190
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume99
Issue number26
DOIs
StatePublished - Dec 24 2002
Externally publishedYes

ASJC Scopus subject areas

  • General

Fingerprint

Dive into the research topics of 'Engineered calmodulins reveal the unexpected eminence of Ca2+ channel inactivation in controlling heart excitation'. Together they form a unique fingerprint.

Cite this