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Cyclic di-GMP (also called cyclic diguanylate and c-di-GMP) is a second messenger used in signal transduction in a wide variety of bacteria. [1] Cyclic di-GMP is not known to be used by archaea , and has only been observed in eukaryotes in Dictyostelium . [ 2 ]
Cyclic-guanylate-specific phosphodiesterase (EC 3.1.4.52, cyclic bis(3′→5')diguanylate phosphodiesterase, c-di-GMP-specific phosphodiesterase, c-di-GMP phosphodiesterase, phosphodiesterase, phosphodiesterase A1, PDEA1, VieA) is an enzyme with systematic name cyclic bis(3′→5′)diguanylate 3-guanylylhydrolase.
Cyclic GMP-AMP (cGAMP) is a cyclic dinucleotide (CDN) and the first to be found in metazoans. Other CDNs (c-di-GMP and c-di-AMP) are commonly found in bacteria, archaea, and protozoa. As the name suggests, cGAMP is cyclic molecule composed of one Adenine monophosphate (AMP) and one Guanine monophosphate (GMP) connected by two phosphodiester bonds.
Phosphodiesterase-5. A phosphodiesterase inhibitor is a drug that blocks one or more of the five subtypes of the enzyme phosphodiesterase (PDE), thereby preventing the inactivation of the intracellular second messengers, cyclic adenosine monophosphate (cAMP) and cyclic guanosine monophosphate (cGMP) by the respective PDE subtype(s).
PDE5 inhibitors are generally well tolerated, with side effects including transient headaches, flushing, dyspepsia, congestion and dizziness. [3] There have also been reports of temporary vision disturbances with sildenafil and, to a lesser extent, vardenafil, and back and muscle pain with tadalafil. [3]
Cyclic di-AMP (also called c-di-AMP and c-di-adenosine monophosphate) is a second messenger used in signal transduction in bacteria and archaea. [ 1 ] [ 2 ] [ 3 ] It is present in many Gram-positive bacteria, some Gram-negative species, and archaea of the phylum Euryarchaeota .
The most commonly available PDE5 inhibitors are sildenafil (Viagra), [14] vardenafil (Levitra), [15] tadalafil (Cialis), [16] and avanafil (Stendra). [17] PDE5 inhibitors are not routinely prescribed as first line treatment for erectile dysfunction. This is as they cause unwanted side effects like hair loss, headache, and nausea (among others ...
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]