Enzymes
| UniProtKB help_outline | 274 proteins |
| Enzyme class help_outline |
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- Name help_outline (2R)-homocitrate Identifier CHEBI:58884 Charge -3 Formula C7H7O7 InChIKeyhelp_outline XKJVEVRQMLKSMO-SSDOTTSWSA-K SMILEShelp_outline O[C@](CCC([O-])=O)(CC([O-])=O)C([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 3 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline (2R,3S)-homoisocitrate Identifier CHEBI:15404 Charge -3 Formula C7H7O7 InChIKeyhelp_outline OEJZZCGRGVFWHK-WVZVXSGGSA-K SMILEShelp_outline O[C@H]([C@H](CCC([O-])=O)C([O-])=O)C([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 3 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:32303 | RHEA:32304 | RHEA:32305 | RHEA:32306 | |
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| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Publications
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Methanogen homoaconitase catalyzes both hydrolyase reactions in coenzyme B biosynthesis.
Drevland R.M., Jia Y., Palmer D.R.J., Graham D.E.
Homoaconitase enzymes catalyze hydrolyase reactions in the alpha-aminoadipate pathway for lysine biosynthesis or the 2-oxosuberate pathway for methanogenic coenzyme B biosynthesis. Despite the homology of this iron-sulfur protein to aconitase, previously studied homoaconitases catalyze only the hy ... >> More
Homoaconitase enzymes catalyze hydrolyase reactions in the alpha-aminoadipate pathway for lysine biosynthesis or the 2-oxosuberate pathway for methanogenic coenzyme B biosynthesis. Despite the homology of this iron-sulfur protein to aconitase, previously studied homoaconitases catalyze only the hydration of cis-homoaconitate to form homoisocitrate rather than the complete isomerization of homocitrate to homoisocitrate. The MJ1003 and MJ1271 proteins from the methanogen Methanocaldococcus jannaschii formed the first homoaconitase shown to catalyze both the dehydration of (R)-homocitrate to form cis-homoaconitate, and its hydration is shown to produce homoisocitrate. This heterotetrameric enzyme also used the analogous longer chain substrates cis-(homo)(2)aconitate, cis-(homo)(3)aconitate, and cis-(homo)(4)aconitate, all with similar specificities. A combination of the homoaconitase with the M. jannaschii homoisocitrate dehydrogenase catalyzed all of the isomerization and oxidative decarboxylation reactions required to form 2-oxoadipate, 2-oxopimelate, and 2-oxosuberate, completing three iterations of the 2-oxoacid elongation pathway. Methanogenic archaeal homoaconitases and fungal homoaconitases evolved in parallel in the aconitase superfamily. The archaeal homoaconitases share a common ancestor with isopropylmalate isomerases, and both enzymes catalyzed the hydration of the minimal substrate maleate to form d-malate. The variation in substrate specificity among these enzymes correlated with the amino acid sequences of a flexible loop in the small subunits. << Less
J. Biol. Chem. 283:28888-28896(2008) [PubMed] [EuropePMC]
This publication is cited by 7 other entries.
Comments
Multi-step reaction: RHEA:26101 and RHEA:15485