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2-Hydroxyisonicotinate dehydrogenase isolated from Mycobacterium sp. INA1
T Schräder1, C Hillebrand, J R Andreesen
1Institut für Mikrobiologie, Martin-Luther-Universität Halle, Germany.
FEMS Microbiology Letters
|July 31, 1998
Summary
Researchers purified 2-hydroxyisonicotinate dehydrogenase from Mycobacterium sp. INA1, revealing its role in isonicotinate degradation and its classification as a molybdo-iron/sulfur flavoprotein.
Area of Science:
- Biochemistry
- Enzymology
- Microbial Metabolism
Background:
- Isonicotinate degradation is a crucial metabolic pathway in certain bacteria.
- Understanding the enzymes involved provides insights into microbial catabolism.
Purpose of the Study:
- To purify and characterize 2-hydroxyisonicotinate dehydrogenase from Mycobacterium sp. INA1.
- To elucidate the enzyme's role in the isonicotinate degradation pathway.
Main Methods:
- Enzyme purification using biochemical techniques.
- Spectroscopic analysis to determine enzyme properties.
- Quantification of cofactors (iron, sulfur, FAD, molybdenum).
Main Results:
- 2-Hydroxyisonicotinate dehydrogenase was purified 26-fold.
- The enzyme exhibits an alpha 2 beta 2 gamma 2 structure with a native molecular mass of 300 kDa.
- Characterized as an iron/sulfur flavoprotein containing molybdopterin cytosine dinucleotide.
Conclusions:
- The enzyme catalyzes the conversion of 2-hydroxyisonicotinate to 2,6-dihydroxypyridine-4-carboxylate.
- It belongs to the molybdo-iron/sulfur flavoprotein class, similar to xanthine oxidase.
- Cyanide inactivates the enzyme, suggesting catalytic mechanism insights.