Abstract
Fatty acid subterminal (omega-1 approximately omega-3) hydroxylase of the fungus Fusarium oxysporum was solubilized from the microsomal fraction and partially purified. The hydroxylase activity was recovered into a single active fraction, and its spectral nature showed the presence of cytochrome P-450 (P-450). Fatty acid hydroxylase activity was markedly restored upon addition of FAD, FMN, and/or hemin to the eluted fraction. The fraction also exhibited other properties characteristic of both a hemeprotein and a flavin-containing reductase. These results are highly indicative that the fungal hydroxylase is a fused protein containing both P-450 and its reductase domains. In this aspect the fungal enzyme resembles bacterial P-450BM3, although it is membrane-bound unlike the bacterial counterpart.
MeSH terms
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Chromatography, Affinity
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Cytochrome P-450 CYP4A
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Cytochrome P-450 Enzyme System / chemistry
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Cytochrome P-450 Enzyme System / isolation & purification
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Cytochrome P-450 Enzyme System / metabolism*
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Fusarium / enzymology*
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Kinetics
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Microsomes / enzymology*
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Mixed Function Oxygenases / chemistry
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Mixed Function Oxygenases / isolation & purification
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Mixed Function Oxygenases / metabolism*
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Multienzyme Complexes / chemistry
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Multienzyme Complexes / isolation & purification*
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Multienzyme Complexes / metabolism
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NADPH-Ferrihemoprotein Reductase / chemistry
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NADPH-Ferrihemoprotein Reductase / isolation & purification
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NADPH-Ferrihemoprotein Reductase / metabolism*
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Solubility
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Spectrophotometry
Substances
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Multienzyme Complexes
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Cytochrome P-450 Enzyme System
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Mixed Function Oxygenases
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Cytochrome P-450 CYP4A
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NADPH-Ferrihemoprotein Reductase