Cloned (Comment) | Organism |
---|---|
gene tnaA, recombinant expression of wild-type and mutant enzymes in Escherichia coli strain BL21(DE3), subcloning in Escherichia coli strain DH5alpha | Citrobacter freundii |
Protein Variants | Comment | Organism |
---|---|---|
F448A | site-directed mutagenesis, the mutant shows a 104fold reduced activity with L-tyrosine compared to wild-type, stopped-flow kinetics of enzyme mutant F448A. The mutant F448A TPL forms quinonoid intermediates from L-tyrosine and S-ethyl-L-cysteine with rate constants similar to those of wild-type TPL, and can form an aminoacrylate intermediate from S-ethyl-L-cysteine but not L-tyrosine, with a rate constant similar to that of wild-type TPL | Citrobacter freundii |
F448H | site-directed mutagenesis, enzyme mutant crystal structure with bound 3-fluoro-L-tyrosine, tense and closed conformation of F448H TPL quinonoid complex with the ligand, overview. Mutant F448H TPL has very low catalytic activity with L-tyrosine compared to wild-type | Citrobacter freundii |
F448L | site-directed mutagenesis, the mutant shows a 103fold reduced activity with L-tyrosine compared to wild-type | Citrobacter freundii |
F449A | site-directed mutagenesis, the mutant shows a 104fold reduced activity with L-tyrosine compared to wild-type | Citrobacter freundii |
Y71F | site-directed mutagenesis, enzyme mutant crystal structure with bound 3-fluoro-L-tyrosine, open conformation of Y71F TPL quinonoid complex with the ligand, overview | Citrobacter freundii |
KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
additional information | - |
additional information | pre-steady-state kinetic and steady-state kinetics, kinetic analysis of recombinant wild-type and mutant enzymes, stopped-flow kinetics of enzyme mutant F448A | Citrobacter freundii |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
L-tyrosine + H2O | Citrobacter freundii | - |
phenol + pyruvate + NH3 | - |
r |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Citrobacter freundii | P31013 | - |
- |
Purification (Comment) | Organism |
---|---|
recombinant wild-type and mutant enzymes from Escherichia coli strain BL21(DE3) by ammonium sulfate fractionation, hydrophobic interaction chromatography, and gel filtration | Citrobacter freundii |
Reaction | Comment | Organism | Reaction ID |
---|---|---|---|
L-tyrosine + H2O = phenol + pyruvate + NH3 | mechanism of alpha,beta-elimination of L-tyrosine catalyzed by enzyme TPL, detailed overview | Citrobacter freundii |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
3-fluoro-L-tyrosine + H2O | 3-fluoro-L-tyrosine also is a good substrate for the wild-type enzyme | Citrobacter freundii | 3-fluorophenol + pyruvate + NH3 | - |
r | |
L-tyrosine + H2O | - |
Citrobacter freundii | phenol + pyruvate + NH3 | - |
r | |
L-tyrosine + H2O | high activity with the wild-type enzyme | Citrobacter freundii | phenol + pyruvate + NH3 | - |
r | |
additional information | of the common S-alkyl-L-cysteine substrates, S-ethyl-L-cysteine has the most favorable kinetic properties with TPL | Citrobacter freundii | ? | - |
? | |
S-(2-nitrophenyl)-L-cysteine + H2O | best substrate for the wild-type enzyme | Citrobacter freundii | 2-nitrobenzenethiolate + pyruvate + NH3 | - |
r | |
S-ethyl-L-cysteine + H2O | - |
Citrobacter freundii | ethanethiol + pyruvate + NH3 | - |
r |
Subunits | Comment | Organism |
---|---|---|
homotetramer | 4 * 51000, recombinant enzyme, SDS-PAGE | Citrobacter freundii |
Synonyms | Comment | Organism |
---|---|---|
TnaA | - |
Citrobacter freundii |
TPL | - |
Citrobacter freundii |
Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
---|---|---|---|
25 | - |
assay at | Citrobacter freundii |
Turnover Number Minimum [1/s] | Turnover Number Maximum [1/s] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
0.000034 | - |
L-tyrosine | pH 8.0, 25°C, recombinant mutant F448H | Citrobacter freundii | |
0.00016 | - |
L-tyrosine | pH 8.0, 25°C, recombinant mutant F449A | Citrobacter freundii | |
0.00026 | - |
L-tyrosine | pH 8.0, 25°C, recombinant mutant F448A | Citrobacter freundii | |
0.005 | - |
L-tyrosine | pH 8.0, 25°C, recombinant mutant F448L | Citrobacter freundii | |
0.12 | - |
S-ethyl-L-cysteine | pH 8.0, 25°C, recombinant mutant F449A | Citrobacter freundii | |
0.23 | - |
S-ethyl-L-cysteine | pH 8.0, 25°C, recombinant mutant F448L | Citrobacter freundii | |
0.26 | - |
S-(2-nitrophenyl)-L-cysteine | pH 8.0, 25°C, recombinant mutant F448L | Citrobacter freundii | |
0.27 | - |
S-ethyl-L-cysteine | pH 8.0, 25°C, recombinant mutant F448H | Citrobacter freundii | |
0.36 | - |
S-(2-nitrophenyl)-L-cysteine | pH 8.0, 25°C, recombinant mutant F449A | Citrobacter freundii | |
0.51 | - |
S-ethyl-L-cysteine | pH 8.0, 25°C, recombinant mutant F448A | Citrobacter freundii | |
0.6 | - |
S-(2-nitrophenyl)-L-cysteine | pH 8.0, 25°C, recombinant mutant F448H | Citrobacter freundii | |
2.5 | - |
S-(2-nitrophenyl)-L-cysteine | pH 8.0, 25°C, recombinant mutant F448A | Citrobacter freundii | |
3.5 | - |
L-tyrosine | pH 8.0, 25°C, recombinant wild-type enzyme | Citrobacter freundii | |
3.9 | - |
S-ethyl-L-cysteine | pH 8.0, 25°C, recombinant wild-type enzyme | Citrobacter freundii | |
9.7 | - |
S-(2-nitrophenyl)-L-cysteine | pH 8.0, 25°C, recombinant wild-type enzyme | Citrobacter freundii |
pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|
8 | - |
assay at | Citrobacter freundii |
Cofactor | Comment | Organism | Structure |
---|---|---|---|
pyridoxal 5'-phosphate | dependent on | Citrobacter freundii |
kcat/KM Value [1/mMs-1] | kcat/KM Value Maximum [1/mMs-1] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
0.0000008 | - |
L-tyrosine | pH 8.0, 25°C, recombinant mutant F449A | Citrobacter freundii | |
0.000088 | - |
S-ethyl-L-cysteine | pH 8.0, 25°C, recombinant mutant F449A | Citrobacter freundii | |
0.00037 | - |
L-tyrosine | pH 8.0, 25°C, recombinant mutant F448H | Citrobacter freundii | |
0.0013 | - |
L-tyrosine | pH 8.0, 25°C, recombinant mutant F448A | Citrobacter freundii | |
0.0062 | - |
S-(2-nitrophenyl)-L-cysteine | pH 8.0, 25°C, recombinant mutant F449A | Citrobacter freundii | |
0.035 | - |
L-tyrosine | pH 8.0, 25°C, recombinant mutant F448L | Citrobacter freundii | |
0.17 | - |
S-ethyl-L-cysteine | pH 8.0, 25°C, recombinant mutant F448H | Citrobacter freundii | |
0.59 | - |
S-ethyl-L-cysteine | pH 8.0, 25°C, recombinant wild-type enzyme | Citrobacter freundii | |
0.965 | - |
S-ethyl-L-cysteine | pH 8.0, 25°C, recombinant mutant F448A | Citrobacter freundii | |
0.994 | - |
S-ethyl-L-cysteine | pH 8.0, 25°C, recombinant mutant F448L | Citrobacter freundii | |
3.3 | - |
S-(2-nitrophenyl)-L-cysteine | pH 8.0, 25°C, recombinant mutant F448H | Citrobacter freundii | |
4.5 | - |
S-(2-nitrophenyl)-L-cysteine | pH 8.0, 25°C, recombinant mutant F448L | Citrobacter freundii | |
9.6 | - |
S-(2-nitrophenyl)-L-cysteine | pH 8.0, 25°C, recombinant mutant F448A | Citrobacter freundii | |
17.5 | - |
L-tyrosine | pH 8.0, 25°C, recombinant wild-type enzyme | Citrobacter freundii | |
46 | - |
S-(2-nitrophenyl)-L-cysteine | pH 8.0, 25°C, recombinant wild-type enzyme | Citrobacter freundii |