GMP synthase (glutamine—hydrolysing)

GMP synthetase (glutamine-hydrolyzing)
File:PDB 1gpm EBI.jpg Crystal structure of GMP synthetase.
Identifiers
EC number	6.3.5.2
CAS number	Template:CAS
Databases
IntEnz	IntEnz view
BRENDA	BRENDA entry
ExPASy	NiceZyme view
KEGG	KEGG entry
MetaCyc	metabolic pathway
PRIAM	profile
PDB structures	RCSB PDB PDBe PDBsum
Gene Ontology	AmiGO / EGO
Search PMC articles PubMed articles NCBI proteins

GMP synthetase C terminal domain
File:PDB 1gpm EBI.jpg escherichia coli gmp synthetase complexed with amp and pyrophosphate
Identifiers
Symbol	GMP_synt_C
Pfam	PF00958
InterPro	IPR001674
PROSITE	PDOC00405
SCOP	1gpm
SUPERFAMILY	1gpm
Available protein structures: Pfam structures PDB RCSB PDB; PDBe; PDBj PDBsum structure summary

Guanine monphosphate synthase
250px Rendering based on PDB 2VPI.
Available structures PDB Ortholog search: PDBe, RCSB List of PDB id codes 2VPI, 2VXO
Identifiers
Symbol	GMPS
External IDs	OMIM: 600358 MGI: 2448526 HomoloGene: 68367 ChEMBL: 5721 GeneCards: GMPS Gene
EC number	6.3.5.2
Gene ontology Molecular function • GMP synthase activity • GMP synthase (glutamine-hydrolyzing) activity • ATP binding • pyrophosphatase activity Cellular component • cytoplasm • cytosol Biological process • purine nucleobase metabolic process • GMP biosynthetic process • glutamine metabolic process • purine nucleobase biosynthetic process • purine ribonucleoside monophosphate biosynthetic process • small molecule metabolic process • nucleobase-containing small molecule metabolic process Sources: Amigo / QuickGO
RNA expression pattern
File:PBB GE GMPS 214431 at tn.png
More reference expression data
Orthologs
Species	Human	Mouse
Entrez	8833	229363
Ensembl	ENSG00000163655	ENSMUSG00000027823
UniProt	P49915	Q3THK7
RefSeq (mRNA)	NM_003875	NM_001033300
RefSeq (protein)	NP_003866	NP_001028472
Location (UCSC)	Chr 3: 155.87 – 155.94 Mb	Chr 3: 63.98 – 64.02 Mb
PubMed search	[1]	[2]

Guanosine monophosphate synthetase, (EC 6.3.5.2) also known as GMPS is an enzyme that converts xanthosine monophosphate to guanosine monophosphate.

In the de novo synthesis of purine nucleotides, IMP is the branch point metabolite at which point the pathway diverges to the synthesis of either guanine or adenine nucleotides. In the guanine nucleotide pathway, there are 2 enzymes involved in converting IMP to GMP, namely IMP dehydrogenase (IMPD1), which catalyzes the oxidation of IMP to XMP, and GMP synthetase, which catalyzes the amination of XMP to GMP.

Enzymology

In enzymology, a GMP synthetase (glutamine-hydrolysing) (EC 6.3.5.2) is an enzyme that catalyzes the chemical reaction

ATP + xanthosine 5'-phosphate + L-glutamine + H₂O $\rightleftharpoons$ AMP + diphosphate + GMP + L-glutamate

The 4 substrates of this enzyme are ATP, xanthosine 5'-phosphate, L-glutamine, and H₂O, whereas its 4 products are AMP, diphosphate, GMP, and L-glutamate.

This enzyme belongs to the family of ligases, specifically those forming carbon-nitrogen bonds carbon-nitrogen ligases with glutamine as amido-N-donor. The systematic name of this enzyme class is xanthosine-5'-phosphate:L-glutamine amido-ligase (AMP-forming). Other names in common use include GMP synthetase (glutamine-hydrolysing), guanylate synthetase (glutamine-hydrolyzing), guanosine monophosphate synthetase (glutamine-hydrolyzing), xanthosine 5'-phosphate amidotransferase, and guanosine 5'-monophosphate synthetase. This enzyme participates in purine metabolism and glutamate metabolism. At least one compound, Psicofuranin is known to inhibit this enzyme.

Structural studies

As of late 2007, 5 structures have been solved for this class of enzymes, with PDB accession codes 1GPM, 1WL8, 2A9V, 2D7J, and 2DPL.

External links

• GMP synthetase at the US National Library of Medicine Medical Subject Headings (MeSH)