2-oxoadipate dioxygenase/decarboxylase that catalyzes the decarboxylation and hydroxylation of 2-oxoadipate to form D-2-hydroxyglutarate. This Fe(2+)-dependent enzyme is specific for 2-oxoadipate and plays a crucial role in D-lysine catabolism in Pseudomonas putida KT2440. The enzyme performs the last step in a lysine degradation pathway, converting 2-oxoadipate (derived from lysine) into D-2-hydroxyglutarate with the release of CO2. Note: The deep research file incorrectly conflates this enzyme with Ξ±-hydroxyglutarate oxidoreductase from 1969 research, which catalyzes the opposite reaction (oxidizing D-2-hydroxyglutarate to 2-oxoglutarate).
| GO Term | Evidence | Action | Reason |
|---|---|---|---|
| GO:0016491 oxidoreductase activity | IEA GO_REF:0000120 | MODIFY | Summary: This general oxidoreductase annotation is correct but too broad. The enzyme does perform oxidation-reduction, but a more specific term should be used. Proposed replacements: 2-oxoadipate dioxygenase/decarboxylase activity Supporting Evidence: file:PSEPK/hglS/hglS-deep-research-falcon.md the transformation is described as an unusual decarboxylation/hydroxylation-like chemistry; associated mechanistic evidence indicates **O2 is consumed stoichiometrically with substrate** and isotopic labeling under **18O2** yields product containing **two 18O atoms**, consistent with incorporation from molecular oxygen. file:PSEPK/hglS/hglS-deep-research-falcon.md This provides a mechanistic rationale for the UniProt-style naming β2-oxoadipate dioxygenase/decarboxylase.β |
| GO:0051213 dioxygenase activity | IEA GO_REF:0000043 | ACCEPT | Summary: Correct annotation - the enzyme is indeed a dioxygenase that incorporates both atoms of O2, with one oxygen going into the hydroxyl group of 2-hydroxyglutarate and the other released as CO2 after decarboxylation. Supporting Evidence: file:PSEPK/hglS/hglS-deep-research.md See deep research file for comprehensive analysis file:PSEPK/hglS/hglS-deep-research-falcon.md HglS is an **Fe(II)-dependent metalloenzyme** that converts **2-oxoadipate (2OA)** to **D-2-hydroxyglutarate (D-2HG)** file:PSEPK/hglS/hglS-deep-research-falcon.md the stereochemistry was assigned using an **enzyme-coupled assay specific for D-2HG**, demonstrating formation of **D-2HG**. |
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Download this section (compressed HTML)Q: Why did evolution select D-2-hydroxyglutarate as the product rather than L-2-hydroxyglutarate?
Suggested experts: Metabolic evolution researchers, stereochemistry experts
Q: What is the physiological role of D-2-hydroxyglutarate in P. putida beyond being a metabolite?
Suggested experts: Bacterial metabolism researchers
Q: Can HglS be engineered for biocatalytic production of chiral hydroxy acids?
Suggested experts: Industrial biotechnology groups
Experiment: Directed evolution of HglS to accept alternative substrates
Experiment: Metabolomics analysis of D-2-hydroxyglutarate levels under different growth conditions
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