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Literature summary for 2.3.2.2 extracted from

  • Martin, M.N.; Slovin, J.P.
    Purified gamma-glutamyl transpeptidases from tomato exhibit high affinity for glutathione and glutathione S-conjugates (2000), Plant Physiol., 122, 1417-1426.
    View publication on PubMedView publication on EuropePMC

Activating Compound

Activating Compound Comment Organism Structure
additional information no effects by KCl, KNO3, KBr, NaCl, CaCl2, MgCl2, MnCl2, CoCl2, ZnCl2, DTT, EDTA Solanum lycopersicum

Inhibitors

Inhibitors Comment Organism Structure
additional information not affected by KCl, KNO3, KBr, NaCl, CaCl2, MgCl2, MnCl2, CoCl2, ZnCl2, DTT, EDTA Solanum lycopersicum

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
additional information
-
additional information biphasic kinetics in transpeptidase reaction with 1-aminocyclopropane-1-carboxylic acid as acceptor, Km-values Solanum lycopersicum
0.09
-
glutathione isoform II Solanum lycopersicum
0.11
-
glutathione isoform I Solanum lycopersicum
1.7
-
L-Glu-4-nitroanilide isoform I, hydrolase reaction Solanum lycopersicum
2.1
-
L-Glu-4-nitroanilide isoform II, hydrolase reaction Solanum lycopersicum

Localization

Localization Comment Organism GeneOntology No. Textmining
membrane
-
Solanum lycopersicum 16020
-
peripheral membrane protein isoforms I and II Solanum lycopersicum
-
-

Metals/Ions

Metals/Ions Comment Organism Structure
Ca2+ no effect Solanum lycopersicum
K+ no effect Solanum lycopersicum
Mg2+ no effect Solanum lycopersicum
additional information no effects by MnCl2, CoCl2, ZnCl2 Solanum lycopersicum
Na+ no effect Solanum lycopersicum

Molecular Weight [Da]

Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
43000
-
gel filtration Solanum lycopersicum

Natural Substrates/ Products (Substrates)

Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
(5-L-glutamyl)-peptide + acceptor + H+ Solanum lycopersicum concurrent reactions: autotranspeptidation with another donor molecule as acceptor, and hydrolase reaction with H2O as acceptor peptide + 5-L-glutamyl amino acid
-
?
glutathione + an amino acid Solanum lycopersicum
-
L-cysteinylglycine + a 5-L-glutamyl-amino acid
-
?

Organism

Organism UniProt Comment Textmining
Solanum lycopersicum
-
2isoforms I and II
-

Posttranslational Modification

Posttranslational Modification Comment Organism
glycoprotein isoforms I and II Solanum lycopersicum
glycoprotein binding of concanavalin A Solanum lycopersicum

Purification (Commentary)

Purification (Comment) Organism
2 isoforms I and II Solanum lycopersicum

Source Tissue

Source Tissue Comment Organism Textmining
pericarp 2 isoforms I and II Solanum lycopersicum
-

Specific Activity [micromol/min/mg]

Specific Activity Minimum [µmol/min/mg] Specific Activity Maximum [µmol/min/mg] Comment Organism
8.175
-
purified isoform II, transpeptidation Solanum lycopersicum
13.41
-
purified isoform I, transpeptidation Solanum lycopersicum
17.37
-
purified isoform II, hydrolase reaction Solanum lycopersicum
24.03
-
purified isoform I, hydrolase reaction Solanum lycopersicum

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
(5-L-glutamyl)-peptide + acceptor + H+ concurrent reaction: hydrolase reaction with H2O as acceptor Solanum lycopersicum peptide + 5-L-glutamyl amino acid
-
?
(5-L-glutamyl)-peptide + acceptor + H+ donor: glutathione S-conjugates Solanum lycopersicum peptide + 5-L-glutamyl amino acid
-
?
(5-L-glutamyl)-peptide + acceptor + H+ alpha-aminoisobutyric acid is no donor Solanum lycopersicum peptide + 5-L-glutamyl amino acid
-
?
(5-L-glutamyl)-peptide + acceptor + H+ acceptor specificity, overview Solanum lycopersicum peptide + 5-L-glutamyl amino acid
-
?
(5-L-glutamyl)-peptide + acceptor + H+ Glu-donor is GSH Solanum lycopersicum peptide + 5-L-glutamyl amino acid
-
?
(5-L-glutamyl)-peptide + acceptor + H+ donor: glutathione disulfide Solanum lycopersicum peptide + 5-L-glutamyl amino acid
-
?
(5-L-glutamyl)-peptide + acceptor + H+ donor specificity, overview Solanum lycopersicum peptide + 5-L-glutamyl amino acid
-
?
(5-L-glutamyl)-peptide + acceptor + H+ acceptors: L-methionine, L-tryptophan, L-alanine, 1-aminocyclopropane-1-carboxylic acid, glutathione Solanum lycopersicum peptide + 5-L-glutamyl amino acid
-
?
(5-L-glutamyl)-peptide + acceptor + H+ concurrent reactions: autotranspeptidation with another donor molecule as acceptor, and hydrolase reaction with H2O as acceptor Solanum lycopersicum peptide + 5-L-glutamyl amino acid
-
?
5-L-glutamyl-4-nitroanilide + H2O hydrolase reaction Solanum lycopersicum 4-nitroaniline + L-glutamate
-
?
glutathione + 1-aminocyclopropane-1-carboxylic acid isoforms I and II Solanum lycopersicum L-cysteinylglycine + 5-L-glutamyl-1-aminocyclopropane-1-carboxylic acid
-
?
glutathione + an amino acid
-
Solanum lycopersicum L-cysteinylglycine + a 5-L-glutamyl-amino acid
-
?
glutathione + H2O hydrolase reaction, concurrent to (auto-)transpeptidation Solanum lycopersicum L-cysteinylglycine + L-glutamate
-
?
L-Glu-4-nitroanilide + glutathione
-
Solanum lycopersicum 4-nitroaniline + 5-L-glutamyl-glutathione
-
?

Subunits

Subunits Comment Organism
monomer 1 * 43000, isoforms I and II, SDS-PAGE Solanum lycopersicum

Synonyms

Synonyms Comment Organism
gamma-GTase
-
Solanum lycopersicum

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
7 9 hydrolysis and transpeptidation, isoforms I and II Solanum lycopersicum