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Literature summary for 6.2.1.5 extracted from
- A specialized citric acid cycle requiring succinyl-coenzyme A (CoA):acetate CoA-transferase (AarC) confers acetic acid resistance on the acidophile Acetobacter aceti (2008), J. Bacteriol., 190, 4933-4940.
Cloned(Commentary)
| Cloned (Comment) | Organism |
|---|---|
| gene aarC, DNA and amino acid sequence determination and analysis, expression analysis, overexpression as soluble His6-tagged enzyme in Escherichia coli | Acetobacter aceti |
Inhibitors
| Inhibitors | Comment | Organism | Structure |
|---|---|---|---|
| Borohydride | inactivation, in the presence of acetyl-CoA causes near-complete loss of enzyme activity consistent with the reduction of the glutamyl-CoA thioester intermediate to 5-hydroxynorvaline, in absence of acetyl-CoA only partial inactivation, 71% activity relative to a control, occurs | Acetobacter aceti |  |
KM Value [mM]
| KM Value [mM] | KM Value Maximum [mM] | Substrate | Comment | Organism | Structure |
|---|---|---|---|---|---|
| additional information | - |
additional information | kinetic analysis, parameters at different conditions, overview | Acetobacter aceti | |
| 0.0221 | - |
succinyl-CoA | pH 8.0, 25°C | Acetobacter aceti | |
| 0.0223 | - |
acetyl-CoA | pH 8.0, 25°C | Acetobacter aceti | |
| 0.9 | - |
succinate | pH 8.0, 25°C | Acetobacter aceti | |
| 70 | - |
acetate | pH 8.0, 25°C | Acetobacter aceti | |
Metals/Ions
| Metals/Ions | Comment | Organism | Structure |
|---|---|---|---|
| Mg2+ | - |
Acetobacter aceti | |
Molecular Weight [Da]
| Molecular Weight [Da] | Molecular Weight Maximum [Da] | Comment | Organism |
|---|---|---|---|
| 55832 | - |
x * 55846, recombinant enzyme, x * 55832, recombinant, borohydride-treated enzyme | Acetobacter aceti |
| 55846 | - |
x * 55846, recombinant enzyme, x * 55832, recombinant, borohydride-treated enzyme | Acetobacter aceti |
Natural Substrates/ Products (Substrates)
| Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
|---|---|---|---|---|---|---|
| ATP + succinate + CoA | Acetobacter aceti | AarC is succinyl-CoA:acetate CoA-transferase, which replaces succinyl-CoA synthetase in a variant CAC, this new bypass appears to reduce metabolic demand for free CoA, reliance upon nucleotide pools, and the likely effect of variable cytoplasmic pH upon CAC flux, the enzyme is required for the citric acid cycle, overview | ADP + phosphate + succinyl-CoA | - |
r | |
Organism
| Organism | UniProt | Comment | Textmining |
|---|---|---|---|
| Acetobacter aceti | B3EY95 | strains 1023 and DSM 2002, aarABC region, gene aarC | - |
Purification (Commentary)
| Purification (Comment) | Organism |
|---|---|
| recombinant His6-tagged enzyme from Escherichia coli by ammonium sulfate fractionation and metal affinity chromatography | Acetobacter aceti |
Reaction
| Reaction | Comment | Organism | Reaction ID |
|---|---|---|---|
| ATP + succinate + CoA = ADP + phosphate + succinyl-CoA | reaction mechanism, Glu435 is a key active site residue, overview. Class I CoA-transferases first bind the acyl-CoA substrate, forming a carboxylate product and an enzyme-CoA thioester intermediate, which accounts for the observed ping-pong kinetics and susceptibility to borohydride inactivation | Acetobacter aceti |
Specific Activity [micromol/min/mg]
| Specific Activity Minimum [µmol/min/mg] | Specific Activity Maximum [µmol/min/mg] | Comment | Organism |
|---|---|---|---|
| 0.053 | - |
strain 2002, reverse reaction | Acetobacter aceti |
| 0.083 | - |
strain 1023, reverse reaction | Acetobacter aceti |
| 0.114 | - |
strain 2002, forward reaction | Acetobacter aceti |
| 0.17 | - |
strain 1023, forward reaction | Acetobacter aceti |
Substrates and Products (Substrate)
| Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
|---|---|---|---|---|---|---|
| ATP + acetate + CoA | - |
Acetobacter aceti | ADP + phosphate + acetyl-CoA | - |
r | |
| ATP + succinate + CoA | - |
Acetobacter aceti | ADP + phosphate + succinyl-CoA | - |
r | |
| ATP + succinate + CoA | AarC is succinyl-CoA:acetate CoA-transferase, which replaces succinyl-CoA synthetase in a variant CAC, this new bypass appears to reduce metabolic demand for free CoA, reliance upon nucleotide pools, and the likely effect of variable cytoplasmic pH upon CAC flux, the enzyme is required for the citric acid cycle, overview | Acetobacter aceti | ADP + phosphate + succinyl-CoA | - |
r | |
Subunits
| Subunits | Comment | Organism |
|---|---|---|
| ? | x * 55846, recombinant enzyme, x * 55832, recombinant, borohydride-treated enzyme | Acetobacter aceti |
Synonyms
| Synonyms | Comment | Organism |
|---|---|---|
| AarC | - |
Acetobacter aceti |
| More | AarC is predicted to be a class I CoAtransferase | Acetobacter aceti |
| SCACT | - |
Acetobacter aceti |
| succinyl-CoA:acetate CoA-transferase | - |
Acetobacter aceti |
| succinyl-coenzyme A:acetate CoA-transferase | - |
Acetobacter aceti |
Temperature Optimum [°C]
| Temperature Optimum [°C] | Temperature Optimum Maximum [°C] | Comment | Organism |
|---|---|---|---|
| 25 | - |
assay at | Acetobacter aceti |
Turnover Number [1/s]
| Turnover Number Minimum [1/s] | Turnover Number Maximum [1/s] | Substrate | Comment | Organism | Structure |
|---|---|---|---|---|---|
| 70.9 | - |
succinate | pH 8.0, 25°C | Acetobacter aceti | |
| 75.2 | - |
acetyl-CoA | pH 8.0, 25°C | Acetobacter aceti | |
| 201 | - |
succinyl-CoA | pH 8.0, 25°C | Acetobacter aceti | |
| 280 | - |
acetate | pH 8.0, 25°C | Acetobacter aceti | |
pH Optimum
| pH Optimum Minimum | pH Optimum Maximum | Comment | Organism |
|---|---|---|---|
| 8 | - |
assay at | Acetobacter aceti |
Cofactor
| Cofactor | Comment | Organism | Structure |
|---|---|---|---|
| ATP | - |
Acetobacter aceti | |
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