Guanylyl cyclase C receptor: regulation of catalytic activity by ATP

Bhandari, Rashna ; Suguna, K. ; Visweswariah, Sandhya S. (1999) Guanylyl cyclase C receptor: regulation of catalytic activity by ATP Bioscience Reports, 19 (3). pp. 179-188. ISSN 0144-8463

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Guanylyl cyclase C (GCC), a member of the family of membrane bound guanylyl cyclases is the receptor for the heat-stable enterotoxin (ST) peptides and the guanylin family of endogenous peptides. GCC is activated upon ligand binding to increase intracellular cGMP levels, which in turn activates other downstream signalling events in the cell. GCC is also activated in vitro by nonionic detergents. We have used the T84 cell line as a model system to investigate the regulation of GCC activity by ATP. Ligand-stimulated GCC activity is potentiated in the presence of ATP, whereas detergent-stimulated activity is inhibited. The potentiation of GCC activity by ATP is dependent on the presence of Mg2+ ions, and is probably brought about by a direct binding of Mg-ATP to GCC. The protein kinase-like domain of GCC, which has earlier been shown to play a critical role in the regulation of GCC activity, may be a possible site for the binding of Mg-ATP to GCC.

Item Type:Article
Source:Copyright of this article belongs to Springer.
Keywords:Guanylyl Cyclase C; Protein Kinases; cGMP
ID Code:56981
Deposited On:25 Aug 2011 09:15
Last Modified:25 Aug 2011 09:15

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