Glutamin-(asparagin-)ase

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glutamin-(asparagin-)ase
Identifiers
EC no. 3.5.1.38
CAS no. 39335-03-0
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 / QuickGO
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PMC articles
PubMed articles
NCBI proteins

In enzymology, a glutamin-(asparagin-)ase (EC 3.5.1.38) is an enzyme that catalyzes the chemical reaction

L-glutamine + H2O L-glutamate + NH3

Thus, the two substrates of this enzyme are L-glutamine and H2O, whereas its two products are L-glutamate and NH3.

This enzyme belongs to the family of hydrolases, those acting on carbon-nitrogen bonds other than peptide bonds, specifically in linear amides. The systematic name of this enzyme class is L-glutamine(L-asparagine) amidohydrolase. This enzyme participates in 4 metabolic pathways: glutamate metabolism, alanine and aspartate metabolism, d-glutamine and d-glutamate metabolism, and nitrogen metabolism.

Structural studies

As of late 2007, 3 structures have been solved for this class of enzymes, with PDB accession codes 1DJO, 1DJP, and 4PGA.

Related Research Articles

<span class="mw-page-title-main">Glutamate dehydrogenase</span> Hexameric enzyme

Glutamate dehydrogenase is an enzyme observed in both prokaryotes and eukaryotic mitochondria. The aforementioned reaction also yields ammonia, which in eukaryotes is canonically processed as a substrate in the urea cycle. Typically, the α-ketoglutarate to glutamate reaction does not occur in mammals, as glutamate dehydrogenase equilibrium favours the production of ammonia and α-ketoglutarate. Glutamate dehydrogenase also has a very low affinity for ammonia, and therefore toxic levels of ammonia would have to be present in the body for the reverse reaction to proceed. In the brain, the NAD+/NADH ratio in brain mitochondria encourages oxidative deamination. In bacteria, the ammonia is assimilated to amino acids via glutamate and aminotransferases. In plants, the enzyme can work in either direction depending on environment and stress. Transgenic plants expressing microbial GLDHs are improved in tolerance to herbicide, water deficit, and pathogen infections. They are more nutritionally valuable.

<span class="mw-page-title-main">Glutamine synthetase</span> Class of enzymes

Glutamine synthetase (GS) is an enzyme that plays an essential role in the metabolism of nitrogen by catalyzing the condensation of glutamate and ammonia to form glutamine:

<span class="mw-page-title-main">GMP synthase</span>

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

In enzymology, a D-glutamate oxidase (EC 1.4.3.7) is an enzyme that catalyzes the chemical reaction

<span class="mw-page-title-main">Glutamate synthase (NADPH)</span>

In enzymology, a glutamate synthase (NADPH) (EC 1.4.1.13) is an enzyme that catalyzes the chemical reaction

In enzymology, a 4-methyleneglutamate—ammonia ligase (EC 6.3.1.7) is an enzyme that catalyzes the chemical reaction

In enzymology, an adenosylcobyric acid synthase (glutamine-hydrolysing) (EC 6.3.5.10) is an enzyme that catalyzes the chemical reaction

In enzymology, an asparaginyl-tRNA synthase (glutamine-hydrolysing) is an enzyme that catalyzes the chemical reaction

Glu-tRNAGln amidotransferase or glutaminyl-tRNA synthase (glutamine-hydrolysing) enzyme is an amidotransferase that catalyzes the conversion of the non-cognate amino acid glutamyl-tRNAGln to the cognate glutaminyl-tRNAGln.. It catalyzes the reaction:

In enzymology, a hydrogenobyrinic acid a,c-diamide synthase (glutamine-hydrolysing) (EC 6.3.5.9) is an enzyme that catalyzes the chemical reaction

<span class="mw-page-title-main">NAD+ synthase (glutamine-hydrolysing)</span>

In enzymology, a NAD+ synthase (glutamine-hydrolysing) (EC 6.3.5.1) is an enzyme that catalyzes the chemical reaction

<span class="mw-page-title-main">Phosphoribosylformylglycinamidine synthase</span>

In enzymology, a phosphoribosylformylglycinamidine synthase (EC 6.3.5.3) is an enzyme that catalyzes the chemical reaction

In enzymology, a 4-methyleneglutaminase (EC 3.5.1.67) is an enzyme that catalyzes the chemical reaction

In enzymology, a D-glutaminase (EC 3.5.1.35) is an enzyme that catalyzes the chemical reaction

In enzymology, a formimidoylglutamate deiminase (EC 3.5.3.13) is an enzyme that catalyzes the chemical reaction

<span class="mw-page-title-main">Omega-amidase</span>

In enzymology, an omega-amidase (EC 3.5.1.3) is an enzyme that catalyzes the chemical reaction

In enzymology, a peptidyl-glutaminase (EC 3.5.1.43) is an enzyme that catalyzes the chemical reaction

In enzymology, a protein-glutamine glutaminase (EC 3.5.1.44) is an enzyme that catalyzes the chemical reaction

In enzymology, a theanine hydrolase (EC 3.5.1.65) is an enzyme that catalyzes the chemical reaction

In enzymology, a D-glutamyltransferase (EC 2.3.2.1) is an enzyme that catalyzes the chemical reaction

References


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