Akt regulates L-type Ca2+ channel activity by modulating Cavalpha1 protein stability.
Akt regulates L-type Ca2+ channel activity by modulating Cavalpha1 protein stability.
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AKT通过调节Cavalpha1蛋白稳定性来调节L型Ca2+通道活性。
DOI:
10.1083/jcb.200805063
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发表时间:
2009-03-23
期刊:
影响因子:
--
通讯作者:
Condorelli G
中科院分区:
文献类型:
--
作者:
Catalucci D;Zhang DH;DeSantiago J;Aimond F;Barbara G;Chemin J;Bonci D;Picht E;Rusconi F;Dalton ND;Peterson KL;Richard S;Bers DM;Brown JH;Condorelli G
The insulin IGF-1–PI3K–Akt signaling pathway has been suggested to improve cardiac inotropism and increase Ca2+ handling through the effects of the protein kinase Akt. However, the underlying molecular mechanisms remain largely unknown. In this study, we provide evidence for an unanticipated regulatory function of Akt controlling L-type Ca2+ channel (LTCC) protein density. The pore-forming channel subunit Cavα1 contains highly conserved PEST sequences (signals for rapid protein degradation), and in-frame deletion of these PEST sequences results in increased Cavα1 protein levels. Our findings show that Akt-dependent phosphorylation of Cavβ2, the LTCC chaperone for Cavα1, antagonizes Cavα1 protein degradation by preventing Cavα1 PEST sequence recognition, leading to increased LTCC density and the consequent modulation of Ca2+ channel function. This novel mechanism by which Akt modulates LTCC stability could profoundly influence cardiac myocyte Ca2+ entry, Ca2+ handling, and contractility.
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影响因子:
5
作者:
Ceci, M;Ross, J;Condorelli, G
通讯作者:
Condorelli, G
影响因子:
20.1
作者:
Aimond, F;Kwak, SP;Nerbonne, JM
通讯作者:
Nerbonne, JM
影响因子:
5
作者:
DeSantiago, J;Maier, LS;Bers, DM
通讯作者:
Bers, DM
影响因子:
4.8
作者:
Kim, YK;Kim, SJ;Vatner, SF
通讯作者:
Vatner, SF
影响因子:
5.5
作者:
BASSANI, JWM;BASSANI, RA;BERS, DM
通讯作者:
BERS, DM