Enzymes
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- Name help_outline (3R)-3-hydroxy-L-aspartate Identifier CHEBI:58196 Charge -1 Formula C4H6NO5 InChIKeyhelp_outline YYLQUHNPNCGKJQ-NHYDCYSISA-M SMILEShelp_outline [NH3+][C@@H]([C@@H](O)C([O-])=O)C([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 2 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline NH4+ Identifier CHEBI:28938 (CAS: 14798-03-9) help_outline Charge 1 Formula H4N InChIKeyhelp_outline QGZKDVFQNNGYKY-UHFFFAOYSA-O SMILEShelp_outline [H][N+]([H])([H])[H] 2D coordinates Mol file for the small molecule Search links Involved in 518 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline oxaloacetate Identifier CHEBI:16452 (Beilstein: 3605372; CAS: 149-63-3) help_outline Charge -2 Formula C4H2O5 InChIKeyhelp_outline KHPXUQMNIQBQEV-UHFFFAOYSA-L SMILEShelp_outline [O-]C(=O)CC(=O)C([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 59 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:19757 | RHEA:19758 | RHEA:19759 | RHEA:19760 | |
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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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Purification and properties of erythro-beta-hydroxyasparate dehydratase from Micrococcus denitrificans.
Gibbs R.G., Morris J.G.
1. The novel enzyme, erythro-beta-hydroxyaspartate dehydratase, a key enzyme of the beta-hydroxyaspartate pathway (Kornberg & Morris, 1963, 1965), has been purified 30-fold from extracts of glycollate-grown Micrococcus denitrificans. The purified preparation was devoid of erythro-beta-hydroxyaspar ... >> More
1. The novel enzyme, erythro-beta-hydroxyaspartate dehydratase, a key enzyme of the beta-hydroxyaspartate pathway (Kornberg & Morris, 1963, 1965), has been purified 30-fold from extracts of glycollate-grown Micrococcus denitrificans. The purified preparation was devoid of erythro-beta-hydroxyaspartate-aldolase activity, and free from enzymes that act on oxaloacetate. 2. Properties of the purified dehydratase were studied by direct assay of the enzymic formation of oxaloacetate and ammonia from added erythro-beta-hydroxyaspartate. 3. The enzyme was highly substrate-specific, utilizing only the l-isomer of erythro-beta-hydroxyaspartate (K(m), 0.43mm, and V(max.), 99mumoles of oxaloacetate formed/min./mg. of protein at pH9.15 and 30 degrees ). Of many compounds tested, only maleate was a competitive inhibitor (K(i), 32mm at pH7.6). 4. The optimum pH for activity was about 9.5. The K(m) varied with pH, showing a marked optimum at pH7.8. The V(max.) also varied with pH in a manner suggesting the presence in the enzyme-substrate complex of a dissociable group of pK'(a) about 8.5. 5. Carbonyl reagents were inhibitory, but of three thiol reagents tested only p-chloromercuribenzoate was inhibitory. 6. A partially resolved preparation of the enzyme was activated four-fold by the addition of pyridoxal phosphate and thereby restored to half activity. 7. EDTA (0.1mm) was almost completely inhibitory, activity being restored by bivalent cations (Mg(2+), Ca(2+) and Mn(2+)); no activation by univalent cations was observed. 8. The findings are discussed in the light of reported properties of related hydroxyamino acid dehydratases. << Less