Enzymes
| UniProtKB help_outline | 5 proteins |
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- Name help_outline 2-oxoheptanedioate Identifier CHEBI:72701 Charge -2 Formula C7H8O5 InChIKeyhelp_outline HABHUTWTLGRDDU-UHFFFAOYSA-L SMILEShelp_outline [O-]C(=O)CCCCC(=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 acetyl-CoA Identifier CHEBI:57288 (Beilstein: 8468140) help_outline Charge -4 Formula C23H34N7O17P3S InChIKeyhelp_outline ZSLZBFCDCINBPY-ZSJPKINUSA-J SMILEShelp_outline CC(=O)SCCNC(=O)CCNC(=O)[C@H](O)C(C)(C)COP([O-])(=O)OP([O-])(=O)OC[C@H]1O[C@H]([C@H](O)[C@@H]1OP([O-])([O-])=O)n1cnc2c(N)ncnc12 2D coordinates Mol file for the small molecule Search links Involved in 361 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H2O Identifier CHEBI:15377 (CAS: 7732-18-5) help_outline Charge 0 Formula H2O InChIKeyhelp_outline XLYOFNOQVPJJNP-UHFFFAOYSA-N SMILEShelp_outline [H]O[H] 2D coordinates Mol file for the small molecule Search links Involved in 6,264 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline (R)-trihomocitrate Identifier CHEBI:72699 Charge -3 Formula C9H11O7 InChIKeyhelp_outline YNPKOQYWJZNZGP-SECBINFHSA-K SMILEShelp_outline O[C@](CCCCC([O-])=O)(CC([O-])=O)C([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 1 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline CoA Identifier CHEBI:57287 (Beilstein: 11604429) help_outline Charge -4 Formula C21H32N7O16P3S InChIKeyhelp_outline RGJOEKWQDUBAIZ-IBOSZNHHSA-J SMILEShelp_outline CC(C)(COP([O-])(=O)OP([O-])(=O)OC[C@H]1O[C@H]([C@H](O)[C@@H]1OP([O-])([O-])=O)n1cnc2c(N)ncnc12)[C@@H](O)C(=O)NCCC(=O)NCCS 2D coordinates Mol file for the small molecule Search links Involved in 1,511 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H+ Identifier CHEBI:15378 Charge 1 Formula H InChIKeyhelp_outline GPRLSGONYQIRFK-UHFFFAOYSA-N SMILEShelp_outline [H+] 2D coordinates Mol file for the small molecule Search links Involved in 9,521 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:44928 | RHEA:44929 | RHEA:44930 | RHEA:44931 | |
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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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Identification of enzymes homologous to isocitrate dehydrogenase that are involved in coenzyme B and leucine biosynthesis in methanoarchaea.
Howell D.M., Graupner M., Xu H., White R.H.
Two putative Methanococcus jannaschii isocitrate dehydrogenase genes, MJ1596 and MJ0720, were cloned and overexpressed in Escherichia coli, and their gene products were tested for the ability to catalyze the NAD- and NADP-dependent oxidative decarboxylation of DL-threo-3-isopropylmalic acid, threo ... >> More
Two putative Methanococcus jannaschii isocitrate dehydrogenase genes, MJ1596 and MJ0720, were cloned and overexpressed in Escherichia coli, and their gene products were tested for the ability to catalyze the NAD- and NADP-dependent oxidative decarboxylation of DL-threo-3-isopropylmalic acid, threo-isocitrate, erythro-isocitrate, and homologs of threo-isocitrate. Neither enzyme was found to use any of the isomers of isocitrate as a substrate. The protein product of the MJ1596 gene, designated AksF, catalyzed the NAD-dependent decarboxylation of intermediates in the biosynthesis of 7-mercaptoheptanoic acid, a moiety of methanoarchaeal coenzyme B (7-mercaptoheptanylthreonine phosphate). These intermediates included (-)-threo-isohomocitrate [(-)-threo-1-hydroxy-1,2, 4-butanetricarboxylic acid], (-)-threo-iso(homo)(2)citrate [(-)-threo-1-hydroxy-1,2,5-pentanetricarboxylic acid], and (-)-threo-iso(homo)(3)citrate [(-)-threo-1-hydroxy-1,2, 6-hexanetricarboxylic acid]. The protein product of MJ0720 was found to be alpha-isopropylmalate dehydrogenase (LeuB) and was found to catalyze the NAD-dependent decarboxylation of one isomer of DL-threo-isopropylmalate to 2-ketoisocaproate; thus, it is involved in the biosynthesis of leucine. The AksF enzyme proved to be thermostable, losing only 10% of its enzymatic activity after heating at 100 degrees C for 10 min, whereas the LeuB enzyme lost 50% of its enzymatic activity after heating at 80 degrees C for 10 min. << Less
J. Bacteriol. 182:5013-5016(2000) [PubMed] [EuropePMC]
This publication is cited by 4 other entries.
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Alpha-keto acid chain elongation reactions involved in the biosynthesis of coenzyme B (7-mercaptoheptanoyl threonine phosphate) in methanogenic Archaea.
Howell D.M., Harich K., Xu H., White R.H.
The biochemistry of the 13 steps involved in the conversion of alpha-ketoglutarate and acetylCoA to alpha-ketosuberate, a precursor to the coenzymes coenzyme B (7-mercapto heptanoylthreonine phosphate) and biotin, has been established in Methanosarcina thermophila. These series of reactions begin ... >> More
The biochemistry of the 13 steps involved in the conversion of alpha-ketoglutarate and acetylCoA to alpha-ketosuberate, a precursor to the coenzymes coenzyme B (7-mercapto heptanoylthreonine phosphate) and biotin, has been established in Methanosarcina thermophila. These series of reactions begin with the condensation of alpha-ketoglutarate and acetylCoA to form trans-homoaconitate. The trans-homoaconitate is then hydrated and dehydrated to cis-homoaconitate with (S)-homocitrate serving as an intermediate. Rehydration of the cis-homoaconitate produces (-)-threo-isohomocitrate [(2R,3S)-1-hydroxy-1,2, 4-butanetricarboxylic acid], which undergoes a NADP+-dependent oxidative decarboxylation to produce alpha-ketoadipate. The resulting alpha-ketoadipate then undergoes two consecutive sets of alpha-ketoacid chain elongation reactions to produce alpha-ketosuberate. In each of these sets of reactions, it has been shown that the homologues of cis-homoaconitate, homocitrate, and (-)-threo-isohomocitrate serve as intermediates. The protein product of the Methanococcus jannaschii MJ0503 gene aksA (AksA) was found to catalyze the condensation of alpha-ketoglutarate and acetylCoA to form trans-homoaconitate. This gene product also catalyzed the condensation of alpha-ketoadipate or alpha-ketopimelate with acetylCoA to form, respectively, the (R)-homocitrate homologues of (R)-2-hydroxy-1,2,5-pentanetricarboxylic acid and (R)-2-hydroxy-1,2, 6-hexanetricarboxylic acid. The alpha-ketosuberate resulting from this series of reactions then undergoes a nonoxidative decarboxylation to form 7-oxoheptanoic acid, a precursor to coenzyme B, and an oxidative decarboxylation to form pimelate, the precursor to biotin. Of the 13 intermediates in this pathway, eight have not previously been reported as occurring in biological systems. << Less
Biochemistry 37:10108-10117(1998) [PubMed] [EuropePMC]
This publication is cited by 1 other entry.