Regulation of the NaV1.5 cytoplasmic domain by calmodulin.

Abstract:

:Voltage-gated sodium channels (Na(v)) underlie the rapid upstroke of action potentials in excitable tissues. Binding of channel-interactive proteins is essential for controlling fast and long-term inactivation. In the structure of the complex of the carboxy-terminal portion of Na(v)1.5 (CTNa(v)1.5) with calmodulin (CaM)-Mg(2+) reported here, both CaM lobes interact with the CTNa(v)1.5. On the basis of the differences between this structure and that of an inactivated complex, we propose that the structure reported here represents a non-inactivated state of the CTNa(v), that is, the state that is poised for activation. Electrophysiological characterization of mutants further supports the importance of the interactions identified in the structure. Isothermal titration calorimetry experiments show that CaM binds to CTNa(v)1.5 with high affinity. The results of this study provide unique insights into the physiological activation and the pathophysiology of Na(v) channels.

journal_name

Nat Commun

journal_title

Nature communications

authors

Gabelli SB,Boto A,Kuhns VH,Bianchet MA,Farinelli F,Aripirala S,Yoder J,Jakoncic J,Tomaselli GF,Amzel LM

doi

10.1038/ncomms6126

subject

Has Abstract

pub_date

2014-11-05 00:00:00

pages

5126

issn

2041-1723

pii

ncomms6126

journal_volume

5

pub_type

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