FRET-based direct detection of dynamic protein kinase A activity on the sarcoplasmic reticulum in cardiomyocytes.
FRET-based direct detection of dynamic protein kinase A activity on the sarcoplasmic reticulum in cardiomyocytes.
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DOI:
10.1016/j.bbrc.2010.11.116
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发表时间:
2011-01-14
影响因子:
3.1
通讯作者:
Xiang YK
中科院分区:
文献类型:
--
作者:
Liu S;Zhang J;Xiang YK
The second messenger cAMP-dependent protein kinase A (PKA) plays an important role in the various cellular and physiological responses. On the sarcoplasmic reticulum (SR) in cardiomyocytes, PKA regulates the calcium cycling for exciting-contraction coupling, which is often dysfunctional in a variety of heart diseases including heart failure. Here, we have developed a novel FRET-based A-kinase activity biosensor (AKAR), termed SR-AKAR3, to visualize the PKA dynamics on the SR. Activation of adrenergic receptor induces a rapid and significant increase in SR-AKAR3 FRET ratio, which is dependent on agonist occupation of the receptor and inhibited by H-89, a PKA inhibitor. Interestingly, direct activation of adenylyl cyclases or application of a cAMP analog 8-br-cAMP induced much slower and smaller increases in SR-AKAR3 FRET ratio. These data indicate that the signaling induced by adrenergic stimulation displays a preferential access to the SR in comparison to those by direct activation of adenylyl cyclases. More, SR-AKAR3 mimics endogenous protein phospholamban on the SR for PKA-mediated phosphorylation and myocyte contraction response under adrenergic stimulation. Together, this new PKA activity biosensor provides a useful tool to directly visualize the dynamic regulation of PKA activity on the SR in cardiomyocytes under various physiological and clinical conditions.
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DOI:
10.1073/pnas.211566798
发表时间:
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影响因子:
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