guanosine

guanosine /gua·no·sine/ (gwah´no-sen) a purine nucleoside, guanine linked to ribose; it is a component of RNA and its nucleotides are important in metabolism. Symbol G.

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cyclic guanosine monophosphate  3',5'-GMP, cGMP, cyclic GMP; a cyclic nucleotide that acts as a second messenger similar in action to cyclic adenosine monophosphate but generally producing opposite effects on cell function.

guanosine monophosphate  (GMP) a nucleotide important in metabolism and RNA synthesis.

guanosine triphosphate  (GTP) an energy-rich compound involved in several metabolic reactions and an activated precursor in the synthesis of RNA.

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gua·no·sine (gwän-sn, -sn)

n.

A nucleoside consisting of guanine and ribose.

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guanosine (gwän´sēn),

n a compound derived from a nucleic acid, composed of guanine and a sugar, D-ribose. Guanosine is a major molecular component of the nucleotides guanosine monophosphate and guanosine triphosphate and of DNA and RNA.

guanosine triphosphate (GTP),

n a high-energy nucleotide, similar to adenosine triphosphate, that functions in various metabolic reactions such as the activation of fatty acids and the formation of the peptide bond in protein synthesis.

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guanosine

a nucleoside, guanine riboside, one of the major constituents of nucleic acids.

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cyclic guanosine monophosphate (cyclic GMP, cGMP)

a cyclic 3',5'-phosphate that acts as an intercellular second messenger mediating the activity of hormones and other substances; essential in vision where cGMP concentrations increase in the dark.

guanosine monophosphate

a nucleotide important in metabolism and nucleic acid synthesis; called also GMP.

guanosine pentophosphate

involved with guanosinetetraphosphate in the so called stringent response of bacteria in which, because the cell does not have a sufficient pool of amino acids to maintain protein synthesis, tRNA and rRNA synthesis is reduced by about 20-fold, which suspends many of the cells' activities until conditions improve.

guanosine tetraphosphate

see guanosine pentophosphate (above).

guanosine triphosphate

an energy-rich compound involved in several metabolic reactions; called also GTP.