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Cyclic guanosine monophosphate (cGMP) is a cyclic nucleotide derived from guanosine triphosphate (GTP). cGMP acts as a second messenger much like cyclic AMP.Its most likely mechanism of action is activation of intracellular protein kinases in response to the binding of membrane-impermeable peptide hormones to the external cell surface. [1]
Guanylate cyclase (EC 4.6.1.2, also known as guanyl cyclase, guanylyl cyclase, or GC; systematic name GTP diphosphate-lyase (cyclizing; 3′,5′-cyclic-GMP-forming)) is a lyase enzyme that converts guanosine triphosphate (GTP) to cyclic guanosine monophosphate (cGMP) and pyrophosphate: [1] GTP = 3′,5′-cyclic GMP + diphosphate
In mammalian cells, cGAMP is synthesized by cyclic GMP-AMP synthase from ATP and GTP upon cytosolic DNA stimulation. [2] cGAMP produced by cGAS contains mixed phosphodiester linkages, with one between 2'-OH of GMP and 5'-phosphate of AMP and the other between 3'-OH of AMP and 5'-phosphate of GMP. [3] [4] [5] [6]
Guanosine monophosphate (GMP), also known as 5′-guanidylic acid or guanylic acid (conjugate base guanylate), is a nucleotide that is used as a monomer in RNA. It is an ester of phosphoric acid with the nucleoside guanosine. GMP consists of the phosphate group, the pentose sugar ribose, and the nucleobase guanine; hence it is a ribonucleotide ...
ANP activation of the ANP catalytic receptor will stimulate its intracellular guanylyl cyclase activity to convert GTP to cGMP. cGMP will then stimulate cGMP-dependent protein kinase (PKG), which will then induce smooth muscle relaxation. This is particularly important in the vasculature, where vascular smooth muscle will bind ANP released as a ...
Soluble guanylate cyclase (sGC), a heterodimeric protein consisting of an alpha and a beta subunit, catalyzes the conversion of GTP to the second messenger cGMP and functions as the main receptor for nitric oxide and nitrovasodilator drugs.
The binding of ANP to its receptor causes the conversion of GTP to cGMP and raises intracellular cGMP. As a consequence, cGMP activates a cGMP-dependent kinase ( PKG or cGK) that phosphorylates proteins at specific serine and threonine residues.
Binding of nitric oxide to the heme results in activation of the C-terminal catalytic domain, which produces cGMP from GTP. The HNOX (Heme Nitric oxide/OXygen binding) domain of the beta subunit of sGC contains the prosthetic heme group, and is part of a family of related sensor proteins found throughout a wide range of organisms.
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