期刊
ACTA BIOCHIMICA ET BIOPHYSICA SINICA
卷 40, 期 7, 页码 651-662出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1745-7270.2008.00438.x
关键词
cAMP; exchange protein directly activated by cAMP (Epac)/cAMP-regulated guanine exchange factor; protein kinase A (PKA)/cAMP-dependent protein kinase; signal transduction
资金
- NIGMS NIH HHS [R01 GM066170, R01 GM066170-02, GM061770, R01 GM066170-03, R01 GM066170-05, R01 GM066170-01A1, R01 GM066170-04] Funding Source: Medline
cAMP-mediated signaling pathways regulate a multitude of important biological processes under both physiological and pathological conditions, including diabetes, heart failure and cancer. In eukaryotic cells, the effects of cAMP are mediated by two ubiquitously expressed intracellular cAMP receptors, the classic protein kinase A (PKA)/cAMP-dependent protein kinase and the recently discovered exchange protein directly activated by cAMP (Epac)/cAMP-regulated guanine nucleotide exchange factors. Like PKA, Epac contains an evolutionally conserved cAMP binding domain that acts as a molecular switch for sensing intracellular second messenger cAMP levels to control diverse biological functions. The existence of two families of cAMP effectors provides a mechanism for a more precise and integrated control of the cAMP signaling pathways in a spatial and temporal manner. Depending upon the specific cellular environments as well as their relative abundance, distribution and localization, Epac and PKA may act independently, converge synergistically or oppose each other in regulating a specific cellular function.
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