General Stability | Organism |
---|---|
loss of the [2Fe-2S]2+ cluster from BioB does not result in global unfolding of the polypeptide chain at 20°C and does not result in significant destabilization of the dimer interface | Escherichia coli |
Metals/Ions | Comment | Organism | Structure |
---|---|---|---|
Iron | BioB appears to be resistant to degradation and capable of multiple turnovers only under high-iron conditions that favor repair of the FeS clusters, a process most likely mediated by the Isc or Suf iron-sulfur cluster assembly systems. | Escherichia coli | |
Iron | loss of the FeS clusters results in decreased thermal stability and apparent localized unfolding of BioB, particularly in the regions around Arg168 and Arg245, but not global unfolding | Escherichia coli | |
Iron | the [2Fe-2S]2+ cluster is both the sulfur-donating substrate and the sulfur-oxidizing cofactor | Escherichia coli |
Natural Substrates | Organism | Comment (Nat. Sub.) | Natural Products | Comment (Nat. Pro.) | Rev. | Reac. |
---|---|---|---|---|---|---|
dethiobiotin + sulfur | Escherichia coli | biotin synthase is active for only one turnover, during which the [2Fe-2S]2+ cluster is destroyed, one sulfide from the cluster is incorporated as the biotin thiophane sulfur, while Fe2+ ions and the remaining S2- ion are released from the protein | biotin | - |
? |
Organism | UniProt | Comment | Textmining |
---|---|---|---|
Escherichia coli | - |
- |
- |
Purification (Comment) | Organism |
---|---|
- |
Escherichia coli |
Substrates | Comment Substrates | Organism | Products | Comment (Products) | Rev. | Reac. |
---|---|---|---|---|---|---|
dethiobiotin + sulfur | biotin synthase is active for only one turnover, during which the [2Fe-2S]2+ cluster is destroyed, one sulfide from the cluster is incorporated as the biotin thiophane sulfur, while Fe2+ ions and the remaining S2- ion are released from the protein | Escherichia coli | biotin | - |
? |
Subunits | Comment | Organism |
---|---|---|
dimer | 2Fe-BioB, 92800, 86% dimer, equilibrium analytical ultracentrifugation | Escherichia coli |
More | 2Fe-BioB, 188200, 14% tetramer, equilibrium analytical ultracentrifugation, tetrameric BioB is less active than dimeric enzyme, and it is assumed that the more abundant and active dimer reflects the native quaternary structure | Escherichia coli |
Synonyms | Comment | Organism |
---|---|---|
BioB | - |
Escherichia coli |
biotin synthase | - |
Escherichia coli |
Temperature Stability Minimum [°C] | Temperature Stability Maximum [°C] | Comment | Organism |
---|---|---|---|
additional information | - |
The loss of each FeS cluster results in a corresponding moderate decrease in the thermal stability, loss of the [4Fe-4S]2+ cluster and the bound substrates results in a 7°C decrease in stability | Escherichia coli |
Turnover Number Minimum [1/s] | Turnover Number Maximum [1/s] | Substrate | Comment | Organism | Structure |
---|---|---|---|---|---|
additional information | - |
additional information | BioB is active for only one turnover, during which the [2Fe-2S]2+ cluster is destroyed, one sulfide from the cluster is incorporated as the biotin thiophane sulfur, while Fe2+ ions and the remaining S2- ion are released from the protein | Escherichia coli |