Guanosine monophosphate

Not to be confused with Cyclic guanosine monophosphate.

Guanosine monophosphate

Names
IUPAC name [(2R,3S,4R,5R)-5-(2-Amino-6-oxo-3H-purin-9-yl)-3,4-dihydroxyoxolan-2-yl]methyl dihydrogen phosphate
Other names 5'-Guanidylic acid, 5'-Guanylic acid, E number E626
Identifiers
CAS Number	85-32-5 Y
Abbreviations	GMP
ChEMBL	ChEMBL604603 N
IUPHAR/BPS	5123
Jmol 3D model	Interactive image
MeSH	Guanosine+monophosphate
PubChem	6804
SMILES C1=NC2=C(N1[C@H]3[C@@H]([C@@H]([C@H](O3)COP(=O)(O)O)O)O)NC(=NC2=O)N
Properties
Chemical formula	C10H14N5O8P
Molar mass	363.22 g/mol
Acidity (pKa)	0.7, 2.4, 6.1, 9.4
Vapor pressure	{{{value}}}
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YN ?)
Infobox references

Guanosine monophosphate, also known as 5'-guanidylic acid or guanylic acid and abbreviated GMP, 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 ribonucleoside monophosphate. Guanosine monophosphate is commercially produced by microbial fermentation.

Guanosine monophosphate in the form of its salts, such as disodium guanylate (E627), dipotassium guanylate (E628) and calcium guanylate (E629), are food additives used as flavor enhancers to provide the umami taste. It is often used in synergy with disodium inosinate; the combination is known as disodium 5'-ribonucleotides. Disodium guanylate is often found in instant noodles, potato chips and snacks, savoury rice, tinned vegetables, cured meats, and packet soup.

As it is a fairly expensive additive, it is usually not used independently of glutamic acid or monosodium glutamate (MSG), which also contribute umami. If inosinate and guanylate salts are present in a list of ingredients but MSG does not appear to be, the glutamic acid is likely provided as part of another ingredient, such as a processed soy protein complex (hydrolyzed soy protein), autolyzed yeast or soy sauce.

As inhibitor of guanosine monophosphate synthesis in experimental models, the glutamine analogue DON can be used.

As an acyl substituent, it takes the form of the prefix guanylyl-.

De novo synthsis of GMP

GMP synthesis starts with D-ribose 5'-phosphate, a product of the pentose phosphate pathway. The synthesis proceeds by the gradual formation of the purine ring on carbon-1 of ribose, with CO₂, glutamine, glycine, aspartate and one-carbon derivatives of tetrahydrofolate donating various elements towards the building of the ring

cGMP

GMP can also exist as a cyclic structure known as cyclic GMP. Within certain cells the enzyme guanylyl cyclase makes cGMP from GTP.

cGMP plays an important role in mediating hormonal signaling.

See also

• Hypoxanthine-guanine phosphoribosyltransferase
• Ribonucleoside
• Umami