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Information on EC 6.3.2.2 - glutamate-cysteine ligase

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EC Tree
IUBMB Comments
Can use L-aminohexanoate in place of glutamate.
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This record set is specific for:
UNIPROT: P48508
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Word Map
The expected taxonomic range for this enzyme is: Bacteria, Eukaryota, Archaea
Synonyms
gcl, gamma-glutamylcysteine synthetase, glutamate-cysteine ligase, gamma-gcs, glutamate cysteine ligase, gamma-glutamylcysteine ligase, gamma-ecs, glclc, gammagcs, gamma-gc, more
SYNONYM
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
Gamma-ECS
-
-
-
-
gamma-Glutamyl-L-cysteine synthetase
-
-
-
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gamma-Glutamylcysteine synthetase
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-
-
-
gamma-Glutamylcysteinyl-synthetase
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-
-
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GCS
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-
-
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Synthetase, gamma-glutamylcysteine
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-
-
-
REACTION
REACTION DIAGRAM
COMMENTARY hide
ORGANISM
UNIPROT
LITERATURE
ATP + L-glutamate + L-cysteine = ADP + phosphate + gamma-L-glutamyl-L-cysteine
show the reaction diagram
enzyme-bound reaction intermediate is a gamma-glutamyl-phosphate, active site cysteine, catalytic mechanism, active site and substrate binding, Lys38 is an active site residue in the glutamyl binding site, His150 is essential for activity
REACTION TYPE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
carboxylic acid amide formation
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-
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carboxamide formation
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-
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-
PATHWAY SOURCE
PATHWAYS
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-, -, -, -
SYSTEMATIC NAME
IUBMB Comments
L-glutamate:L-cysteine gamma-ligase (ADP-forming)
Can use L-aminohexanoate in place of glutamate.
CAS REGISTRY NUMBER
COMMENTARY hide
9023-64-7
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SUBSTRATE
PRODUCT                       
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
Reversibility
r=reversible
ir=irreversible
?=not specified
ATP + L-Glu + L-Cys
ADP + phosphate + gamma-L-Glu-L-Cys
show the reaction diagram
rate limiting and first step in glutathione biosynthesis, GSH metabolism, overview
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ir
additional information
?
-
NATURAL SUBSTRATE
NATURAL PRODUCT
REACTION DIAGRAM
ORGANISM
UNIPROT
COMMENTARY
(Substrate) hide
LITERATURE
(Substrate)
COMMENTARY
(Product) hide
LITERATURE
(Product)
REVERSIBILITY
r=reversible
ir=irreversible
?=not specified
ATP + L-Glu + L-Cys
ADP + phosphate + gamma-L-Glu-L-Cys
show the reaction diagram
rate limiting and first step in glutathione biosynthesis, GSH metabolism, overview
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ir
additional information
?
-
COFACTOR
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
ATP
the gamma-phosphate is located close to the glutamate binding site by the glycine-rich P-loop, built by the motif M(A/G)FGMGXXCLQ, to facilitate the formation of the enzyme-bound reaction intermediate gamma-glutamyl-phosphate
METALS and IONS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
INHIBITOR
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
4-methylene-L-glutamate
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5-Chloro-4-oxo-L-norvaline
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Ki VALUE [mM]
INHIBITOR
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
IMAGE
2.5
4-methylene-L-glutamate
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7.75
5-Chloro-4-oxo-L-norvaline
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12.5
ophthalmic acid
noncompetitive
additional information
additional information
-
SPECIFIC ACTIVITY [µmol/min/mg]
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
25
purified enzyme
additional information
ORGANISM
COMMENTARY hide
LITERATURE
UNIPROT
SEQUENCE DB
SOURCE
light, regulatory subunit
SwissProt
Manually annotated by BRENDA team
SOURCE TISSUE
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
SOURCE
LOCALIZATION
ORGANISM
UNIPROT
COMMENTARY hide
GeneOntology No.
LITERATURE
SOURCE
UNIPROT
ENTRY NAME
ORGANISM
NO. OF AA
NO. OF TRANSM. HELICES
MOLECULAR WEIGHT[Da]
SOURCE
SEQUENCE
LOCALIZATION PREDICTION?
GSH0_RAT
274
0
30548
Swiss-Prot
-
MOLECULAR WEIGHT
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
100000
kidney enzyme, native PAGE
POSTTRANSLATIONAL MODIFICATION
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
phosphoprotein
the heavy, catalytic subunit can be phosphorylated by dibutyrl cAMP in hepatocytes, and by protein kinase C, protein kinase A, and Ca2+/calmodulin-dpendent kinas II on serine and threonine residues in presence of Mg2+, regulatory role of dephosphorylation/phosphorylation in vivo
PROTEIN VARIANTS
ORGANISM
UNIPROT
COMMENTARY hide
LITERATURE
H150A
site-directed mutagenesis, inactive mutant
K38N
site-directed mutagenesis, 50% reduced activity and 2 to 3fold increased Km for L-Glu compared to the wild-type
K38Q
site-directed mutagenesis, 50% reduced activity and 2 to 3fold increased Km for L-Glu compared to the wild-type
K38R
site-directed mutagenesis, slightly decreased activity
GENERAL STABILITY
ORGANISM
UNIPROT
LITERATURE
enzyme is inactivated by freezing
glycerol is required for enzyme stability during storage
L-glutamate stabilizes the enzyme during purification,
Mn2+ destabilizes the enzyme during purification
STORAGE STABILITY
ORGANISM
UNIPROT
LITERATURE
-20°C, purified enzyme, 25% glycerol, indefinitely stable
REF.
AUTHORS
TITLE
JOURNAL
VOL.
PAGES
YEAR
ORGANISM (UNIPROT)
PUBMED ID
SOURCE
Griffith, O.W.; Mulcahy, R.T.
The enzymes of glutathione synthesis: gamma-glutamylcysteine synthetase
Adv. Enzymol. Relat. Areas Mol. Biol.
73
209-267
1999
Ascaris suum, Bos taurus, [Candida] boidinii, Ovis aries, Nicotiana tabacum, no activity in Entamoeba histolytica, Proteus mirabilis, Sus scrofa, Xenopus sp., no activity in Giardia sp., Mus musculus (A0A0H2UNM8), Mus musculus (P97494), Escherichia coli (P0A6W9), Rattus norvegicus (P19468), Rattus norvegicus (P48508), Saccharomyces cerevisiae (P32477), Arabidopsis thaliana (P46309), Homo sapiens (P48506), Homo sapiens (P48507), Homo sapiens, Leishmania tarentolae (P90557), Schizosaccharomyces pombe (Q09768), Trypanosoma brucei (Q26820), Acidithiobacillus ferrooxidans (Q56277)
Manually annotated by BRENDA team