cAMP activates EPAC1

Stable Identifier
R-HSA-381668
Type
Reaction [binding]
Species
Homo sapiens
Compartment
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Each molecule of Epac1 binds 1 molecule of cAMP. Epac1 binds cAMP less tightly than PKA binds cAMP so it is believed that Epac1 binds cAMP after PKA is saturated. The binding of cAMP by Epac1 activates the guanyl nucleotide exchange activity of Epac1. Epac1 has also been shown to bind the SUR1 subunit of ATP-gated potassium channels (KATP channels) in beta cells so Epac1 may participate in direct regulation of potassium transport.
Epac1 also interacts with the calcium sensor Piccolo in a complex with Rim2 at the cell membrane. This may influence exocytosis of insulin.

Literature References
PubMed ID Title Journal Year
15569269 Glucagon-like peptide-1: regulation of insulin secretion and therapeutic potential

Gromada, J, Brock, B, Schmitz, O, Rorsman, P

Basic Clin Pharmacol Toxicol 2004
12401793 Piccolo, a Ca2+ sensor in pancreatic beta-cells. Involvement of cAMP-GEFII.Rim2.Piccolo complex in cAMP-dependent exocytosis

Fujimoto, K, Shibasaki, T, Yokoi, N, Kashima, Y, Matsumoto, M, Sasaki, T, Tajima, N, Iwanaga, T, Seino, S

J Biol Chem 2002
12496249 Epac-selective cAMP analog 8-pCPT-2'-O-Me-cAMP as a stimulus for Ca2+-induced Ca2+ release and exocytosis in pancreatic beta-cells

Kang, G, Joseph, JW, Chepurny, OG, Monaco, M, Wheeler, MB, Bos, JL, Schwede, F, Genieser, HG, Holz, GG

J Biol Chem 2003
16973695 Cell physiology of cAMP sensor Epac

Holz, GG, Kang, G, Harbeck, M, Roe, MW, Chepurny, OG

J Physiol 2006
16613879 cAMP sensor Epac as a determinant of ATP-sensitive potassium channel activity in human pancreatic beta cells and rat INS-1 cells

Kang, G, Chepurny, OG, Malester, B, Rindler, MJ, Rehmann, H, Bos, JL, Schwede, F, Coetzee, WA, Holz, GG

J Physiol 2006
11071853 Expression of cAMP-regulated guanine nucleotide exchange factors in pancreatic beta-cells

Leech, CA, Holz, GG, Chepurny, O, Habener, JF

Biochem Biophys Res Commun 2000
18202100 Role of the cAMP sensor Epac as a determinant of KATP channel ATP sensitivity in human pancreatic beta-cells and rat INS-1 cells

Kang, G, Leech, CA, Chepurny, OG, Coetzee, WA, Holz, GG

J Physiol 2008
17306374 Mechanisms of action of glucagon-like peptide 1 in the pancreas

Doyle, ME, Egan, JM

Pharmacol Ther 2007
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