Literature summary extracted from
Knauer, S.H.; Buckel, W.; Dobbek, H.
Structural basis for reductive radical formation and electron recycling in (R)-2-hydroxyisocaproyl-CoA dehydratase (2011), J. Am. Chem. Soc., 133, 4342-4347.
Cloned(Commentary)
EC Number |
Cloned (Comment) |
Organism |
---|
4.2.1.157 |
overexpression in Escherichia coli |
Clostridioides difficile |
Crystallization (Commentary)
EC Number |
Crystallization (Comment) |
Organism |
---|
4.2.1.157 |
crystals of the dehydratase are grown at 16°C by the vapor diffusion technique from a reservoir solution containing 18-29% (w/v) PEG 3350 and 100 mM BisTris (pH 6.5). The dehydratase is cocrystallized by incubation with 5 mM (R)-2-hydroxyisocaproate 10 min prior to crystallization |
Clostridioides difficile |
Metals/Ions
EC Number |
Metals/Ions |
Comment |
Organism |
Structure |
---|
4.2.1.157 |
[4Fe-4S] center |
the crystal structure reveals that the heterodimeric protein contains two [4Fe-4S] clusters at a distance of 12 A, each coordinated by three cysteines and one terminal ligand. The cluster in the alpha-subunit is part of the active site. In the absence of substrate, a water/hydroxide ion acts as the fourth ligand. The substrate replaces this ligand and coordinates the cluster via the carbonyl-oxygen of the thioester group. The cluster in the beta-subunit has a terminal sulfhydryl/sulfido ligand and can act as a reservoir to protect the electron from unwanted side reactions via a recycling mechanism |
Clostridioides difficile |
|
Natural Substrates/ Products (Substrates)
EC Number |
Natural Substrates |
Organism |
Comment (Nat. Sub.) |
Natural Products |
Comment (Nat. Pro.) |
Rev. |
Reac. |
---|
4.2.1.157 |
(R)-2-hydroxy-4-methylpentanoyl-CoA |
Clostridioides difficile |
the enzyme is involved in fermentation of L-leucine |
4-methylpent-2-enoyl-CoA + H2O |
- |
? |
|
Organism
EC Number |
Organism |
UniProt |
Comment |
Textmining |
---|
4.2.1.157 |
Clostridioides difficile |
Q5U923 and Q5U924 |
hadC: Q5U923, hadB: Q5U924 |
- |
Purification (Commentary)
EC Number |
Purification (Comment) |
Organism |
---|
4.2.1.157 |
- |
Clostridioides difficile |
Substrates and Products (Substrate)
EC Number |
Substrates |
Comment Substrates |
Organism |
Products |
Comment (Products) |
Rev. |
Reac. |
---|
4.2.1.157 |
(R)-2-hydroxy-4-methylpentanoyl-CoA |
the enzyme is involved in fermentation of L-leucine |
Clostridioides difficile |
4-methylpent-2-enoyl-CoA + H2O |
- |
? |
|
4.2.1.157 |
(R)-2-hydroxy-4-methylpentanoyl-CoA |
the catalyzed reaction, an atypical alpha/beta-dehydration, depends on the reductive formation of ketyl radicals on the substrate generated by injection of a single electron from the ATP-dependent activator protein |
Clostridioides difficile |
4-methylpent-2-enoyl-CoA + H2O |
- |
? |
|
Subunits
EC Number |
Subunits |
Comment |
Organism |
---|
4.2.1.157 |
heterodimer |
- |
Clostridioides difficile |
Synonyms
EC Number |
Synonyms |
Comment |
Organism |
---|
4.2.1.157 |
HadBC |
- |
Clostridioides difficile |