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PMID:9721300
| Citation |
He, Z, Davis, JK and Spain, JC (1998) Purification, characterization, and sequence analysis of 2-aminomuconic 6-semialdehyde dehydrogenase from Pseudomonas pseudoalcaligenes JS45. J. Bacteriol. 180:4591-5 |
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| Abstract |
2-Aminonumconic 6-semialdehyde is an unstable intermediate in the biodegradation of nitrobenzene and 2-aminophenol by Pseudomonas pseudoalcaligenes JS45. Previous work has shown that enzymes in cell extracts convert 2-aminophenol to 2-aminomuconate in the presence of NAD+. In the present work, 2-aminomuconic semialdehyde dehydrogenase was purified and characterized. The purified enzyme migrates as a single band on sodium dodecyl sulfate-polyacrylamide gel electrophoresis with a molecular mass of 57 kDa. The molecular mass of the native enzyme was estimated to be 160 kDa by gel filtration chromatography. The optimal pH for the enzyme activity was 7.3. The enzyme is able to oxidize several aldehyde analogs, including 2-hydroxymuconic semialdehyde, hexaldehyde, and benzaldehyde. The gene encoding 2-aminomuconic semialdehyde dehydrogenase was identified by matching the deduced N-terminal amino acid sequence of the gene with the first 21 amino acids of the purified protein. Multiple sequence alignment of various semialdehyde dehydrogenase protein sequences indicates that 2-aminomuconic 6-semialdehyde dehydrogenase has a high degree of identity with 2-hydroxymuconic 6-semialdehyde dehydrogenases. |
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| Keywords |
Aldehyde Oxidoreductases/genetics; Aldehyde Oxidoreductases/isolation & purification; Aldehyde Oxidoreductases/metabolism; Amino Acid Sequence; Aminomuconate-Semialdehyde Dehydrogenase; Catalysis; Chromatography, Gel; Electrophoresis, Polyacrylamide Gel; Molecular Sequence Data; Molecular Weight; Pseudomonas/enzymology; Sequence Homology, Amino Acid; Substrate Specificity |
| edit table |
Significance
Annotations
| Gene product | Qualifier | GO Term | Evidence Code | with/from | Aspect | Extension | Notes | Status |
|---|---|---|---|---|---|---|---|---|
|
enables |
GO:0047102: aminomuconate-semialdehyde dehydrogenase activity |
ECO:0000314: direct assay evidence used in manual assertion |
F |
Seeded From UniProt |
complete | |||
| GO:0047102: aminomuconate-semialdehyde dehydrogenase activity |
ECO:0000314: |
F |
Fig. 2 indicates that 2-AMS was converted to 2-aminomuconate by AmnC. An absorbance maxima appears at A326 instead of A263 when AmnC is included. |
complete | ||||
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References
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