EC Number | Cloned (Comment) | Organism |
---|---|---|
2.6.1.B16 | recombinant expression of C-terminally His6-tagged wild-type and mutant enzymes in transformed phage-resistant Escherichia coli strain BL21(DE3) | uncultured bacterium |
2.6.1.B16 | recombinant expression of C-terminally His6-tagged wild-type and mutant enzymes in transformed phage-resistant Escherichia coli strain BL21(DE3) | Bacillus anthracis |
EC Number | Protein Variants | Comment | Organism |
---|---|---|---|
2.6.1.B16 | G51S | site-directed mutagenesis, the ATA-v2 mutant shows superior operational, temperature and solvent stability as well as improved activity for the pharmaceutical relevant amine product 4-phenyl-2-butanamine appears to be specific for thermal tolerance, compared to wild-type, mutant ATA-v1 shows increased temperature optimum, and features excellent operational stability in biphasic (aqueous/nonpolar solvent) reaction systems at 45°C, when the aqueous phase contained an approximate amine donor-to-acceptor ratio | uncultured bacterium |
2.6.1.B16 | additional information | comparison of pH-profile and amino acceptor substrate specificity of mutants R162A and R410A and wild-type Ban-TA | Bacillus anthracis |
2.6.1.B16 | additional information | semi-rational mutagenesis study for enzymes with higher activity and higher selectivity, employing the proprietary multi-dimensional-mutagenesis (MDM) and automated generation of mutant (AGM) technologies (c-LEcta) | uncultured bacterium |
2.6.1.B16 | N161I/Y164L | site-directed mutagenesis, double mutant ATA-v1 with two point mutations in the cofactor-ring motif shows superior operational, temperature and solvent stability as well as improved activity for the pharmaceutical relevant amine product 4-phenyl-2-butanamine, while the enantioselectivity for (S)-PBA is raised from 59 to 96%, compared to the wild-type enzyme. Compared to wild-type, mutant ATA-v1 shows increased temperature optimum, and features excellent operational stability in biphasic (aqueous/nonpolar solvent) reaction systems at 45°C, when the aqueous phase contained an approximate amine donor-to-acceptor ratio of 50:1. In contrast to wild-type ATA, ATA-v1 seems to resist denaturation upon interfacial contact under turbulent conditions. ATA-v1 appears to slightly gain activity with time in the presence of n-heptane and toluene | uncultured bacterium |
2.6.1.B16 | R162A | site-directed mutagenesis, compared to wild-type, activities of the R162 mutant drop around ten times if the reaction comprises carboxylic substrates, e.g. when (S)-PEA is employed with pyruvate or succinic semialdehyde as substrates | Bacillus anthracis |
2.6.1.B16 | R410A | site-directed mutagenesis, the mutant converts all tested substrate combinations with similar or slightly higher activity compared to wild-type | Bacillus anthracis |
EC Number | Inhibitors | Comment | Organism | Structure |
---|---|---|---|---|
2.6.1.B16 | isopropyl acetate | - |
uncultured bacterium |
EC Number | KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|---|
2.6.1.B16 | additional information | - |
additional information | reaction kinetics and thermodynamics of wild-type and mutant enzymes | uncultured bacterium |
EC Number | Organic Solvent | Comment | Organism |
---|---|---|---|
2.6.1.B16 | isopropyl acetate | the wild-type enzyme rapidly inactivates in isopropyl acetate, while enzyme mutants ATA-v1 and ATA-v2 are more stable, overview | uncultured bacterium |
2.6.1.B16 | toluene | the wild-type enzyme rapidly inactivates in toluene, while enzyme mutants ATA-v1 and ATA-v2 are more stable, overview | uncultured bacterium |
EC Number | Organism | UniProt | Comment | Textmining |
---|---|---|---|---|
2.6.1.B16 | Bacillus anthracis | Q81SL2 | - |
- |
2.6.1.B16 | uncultured bacterium | - |
sequence from a a metagenomic library | - |
EC Number | Specific Activity Minimum [µmol/min/mg] | Specific Activity Maximum [µmol/min/mg] | Comment | Organism |
---|---|---|---|---|
2.6.1.B16 | 0.0016 | - |
purified recombinant wild-type enzyme, pH 10.0, 30°C, substrates (S)-1-phenylethylamine and 4-phenyl-2-butanone | Bacillus anthracis |
2.6.1.B16 | 0.0018 | - |
purified recombinant wild-type enzyme, pH 10.0, 30°C, substrates (S)-1-phenylethylamine and rac-2-methylcyclohexanone | Bacillus anthracis |
2.6.1.B16 | 0.0019 | - |
purified recombinant wild-type enzyme, pH 10.0, 30°C, substrates (S)-1-phenylethylamine and 2-heptanone | Bacillus anthracis |
2.6.1.B16 | 0.002 | - |
purified recombinant wild-type enzyme, pH 10.0, 30°C, substrates (S)-1-phenylethylamine and cyclohexanone | Bacillus anthracis |
2.6.1.B16 | 0.0021 | - |
purified recombinant wild-type enzyme, pH 10.0, 30°C, substrates (S)-1-phenylethylamine and 2-butanone | Bacillus anthracis |
2.6.1.B16 | 0.0028 | - |
purified recombinant wild-type enzyme, pH 10.0, 30°C, substrates (S)-1-phenylethylamine and methoxyacetone | Bacillus anthracis |
2.6.1.B16 | 0.0038 | - |
purified recombinant wild-type enzyme, pH 10.0, 30°C, substrates (S)-1-phenylethylamine and cyclooctanone | Bacillus anthracis |
2.6.1.B16 | 0.0067 | - |
purified recombinant wild-type enzyme, pH 10.0, 30°C, substrates (S)-1-phenylethylamine and beta-tetralone | Bacillus anthracis |
2.6.1.B16 | 0.007 | - |
purified recombinant wild-type enzyme, pH 10.0, 30°C, substrates (S)-1-phenylethylamine and oxaloacetate | Bacillus anthracis |
2.6.1.B16 | 0.94 | - |
purified recombinant wild-type enzyme, pH 10.0, 30°C, substrates (S)-1-phenylethylamine and pyruvate or methylpyruvate | Bacillus anthracis |
2.6.1.B16 | 1.3 | - |
purified recombinant wild-type enzyme, pH 10.0, 30°C, substrates (S)-1-phenylethylamine and 2-oxoglutarate | Bacillus anthracis |
2.6.1.B16 | 2.5 | - |
purified recombinant wild-type enzyme, pH 10.0, 30°C, substrates beta-alanine and pyruvate | Bacillus anthracis |
EC Number | Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|---|
2.6.1.B16 | (S)-1-phenylethylamine + 2-butanone | - |
Bacillus anthracis | acetophenone + ? | - |
r | |
2.6.1.B16 | (S)-1-phenylethylamine + 2-heptanone | - |
Bacillus anthracis | acetophenone + ? | - |
r | |
2.6.1.B16 | (S)-1-phenylethylamine + 2-oxoglutarate | - |
Bacillus anthracis | acetophenone + L-glutamate | - |
r | |
2.6.1.B16 | (S)-1-phenylethylamine + 4-phenyl-2-butanone | - |
Bacillus anthracis | acetophenone + ? | - |
r | |
2.6.1.B16 | (S)-1-phenylethylamine + beta-tetralone | - |
Bacillus anthracis | acetophenone + ? | - |
r | |
2.6.1.B16 | (S)-1-phenylethylamine + cyclohexanone | - |
Bacillus anthracis | acetophenone + ? | - |
r | |
2.6.1.B16 | (S)-1-phenylethylamine + cyclooctanone | - |
Bacillus anthracis | acetophenone + ? | - |
r | |
2.6.1.B16 | (S)-1-phenylethylamine + methoxyacetone | - |
Bacillus anthracis | acetophenone + ? | - |
r | |
2.6.1.B16 | (S)-1-phenylethylamine + methylpyruvate | - |
Bacillus anthracis | acetophenone + methylalanine | - |
r | |
2.6.1.B16 | (S)-1-phenylethylamine + oxaloacetate | - |
Bacillus anthracis | acetophenone + L-aspartate | - |
r | |
2.6.1.B16 | (S)-1-phenylethylamine + pyruvate | - |
Bacillus anthracis | acetophenone + L-alanine | - |
r | |
2.6.1.B16 | (S)-1-phenylethylamine + rac-2-methylcyclohexanone | - |
Bacillus anthracis | acetophenone + ? | - |
r | |
2.6.1.B16 | beta-alanine + pyruvate | high activity | Bacillus anthracis | 4-hydroxybutyrate + L-alanine | - |
r | |
2.6.1.B16 | isopropylamine + 4-phenylbutan-2-one | high activity, two half reaction steps, overview | uncultured bacterium | acetone + (S)-4-phenyl-2-butanamine | - |
r | |
2.6.1.B16 | additional information | substrate specificity of Ban-TA, overview. Even though enzyme Ban-TA shows a relatively narrow amine substrate scope within the tested substrates, it accepts 2-propylamine, which is a prerequisite for industrial asymmetric amine synthesis. Structural information imply that the so-called dual substrate recognition of chemically different substrates (i.e. amines and amino acids) differs from that in formerly known enzymes. It lacks the normally conserved flipping arginine, which enables dual substrate recognition by its side chain flexibility in other omega-amino acid:pyruvate transaminases. Molecular dynamics studies suggest that another arginine (R162) binds omega-amino acids in Ban-TA, but no side chain movements are required for amine and amino acid binding | Bacillus anthracis | ? | - |
- |
EC Number | Subunits | Comment | Organism |
---|---|---|---|
2.6.1.B16 | homotetramer | - |
uncultured bacterium |
EC Number | Synonyms | Comment | Organism |
---|---|---|---|
2.6.1.B16 | amine transaminase | - |
uncultured bacterium |
2.6.1.B16 | ATA | - |
uncultured bacterium |
2.6.1.B16 | Ban-TA | - |
Bacillus anthracis |
2.6.1.B16 | omega-amino acid:pyruvate transaminase | - |
Bacillus anthracis |
EC Number | Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
---|---|---|---|---|
2.6.1.B16 | 30 | - |
assay at | Bacillus anthracis |
2.6.1.B16 | 40 | - |
wild-type ATA | uncultured bacterium |
2.6.1.B16 | 50 | - |
mutant ATA-v1 | uncultured bacterium |
EC Number | Temperature Minimum [°C] | Temperature Maximum [°C] | Comment | Organism |
---|---|---|---|---|
2.6.1.B16 | 30 | 70 | over 50% of maximal activity within this range, mutant enzymes ATA-v1 and ATA-v2 | uncultured bacterium |
2.6.1.B16 | 30 | 55 | activity range, inactivation at 60°C, wild-type enzyme | uncultured bacterium |
EC Number | Temperature Stability Minimum [°C] | Temperature Stability Maximum [°C] | Comment | Organism |
---|---|---|---|---|
2.6.1.B16 | 50 | 75 | enzyme mutant ATA-v1, completely stable up to 70°C, loss of 50% activity at 71°C, inactivation at 75°C | uncultured bacterium |
2.6.1.B16 | 50 | 62 | wild-type enzyme, completely stable up to 55°C, loss of 50% activity at 60°C, inactivation at 62°C | uncultured bacterium |
2.6.1.B16 | 50 | 78 | enzyme mutant ATA-v2, completely stable up to 72°C, loss of 50% activity at 74°C, inactivation at 78°C | uncultured bacterium |
EC Number | pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
---|---|---|---|---|
2.6.1.B16 | 8 | - |
assay at | uncultured bacterium |
2.6.1.B16 | 10 | - |
assay at | Bacillus anthracis |
EC Number | Cofactor | Comment | Organism | Structure |
---|---|---|---|---|
2.6.1.B16 | pyridoxal 5'-phosphate | dependent on | uncultured bacterium | |
2.6.1.B16 | pyridoxal 5'-phosphate | dependent on | Bacillus anthracis |
EC Number | General Information | Comment | Organism |
---|---|---|---|
2.6.1.B16 | evolution | the enzyme belongs to the class-III pyridoxal-phosphate-dependent aminotransferase family | Bacillus anthracis |
2.6.1.B16 | evolution | the enzyme has a high sequence identity to a fold type I class III transaminase from Pseudomonas fluorescens | uncultured bacterium |
2.6.1.B16 | additional information | sequence-structure-function relationship | uncultured bacterium |
2.6.1.B16 | additional information | structure-function analysis, molecular dynamics simulations, and molecular modeling of substrate recognition. Residue W56 is the only residue in direct contact with alanine's carboxylate. Residue R162, pointing towards the substrate from the active site's entrance is binding the carboxylate indirectly via two water molecules | Bacillus anthracis |