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- W1834817612 abstract "A recently developed transformation system has been used to facilitate the sequential disruption of the Candida tropicalis chromosomal POX4 and POX5 genes, encoding distinct isozymes of the acyl coenzyme A (acyl-CoA) oxidase which catalyzes the first reaction in the beta-oxidation pathway. The URA3-based transformation system was repeatedly regenerated by restoring the uracil requirement to transformed strains, either through selection for spontaneous mutations or by directed deletion within the URA 3 coding sequence, to permit sequential gene disruptions within a single strain of C. tropicalis. These gene disruptions revealed the diploid nature of this alkane- and fatty acid-utilizing yeast by showing that it contains two copies of each gene. A comparison of mutants in which both POX4 or both POX5 genes were disrupted revealed that the two isozymes were differentially regulated and displayed unique substrate profiles and kinetic properties. POX4 was constitutively expressed during growth on glucose and was strongly induced by either dodecane or methyl laurate and to a greater extent than POX5, which was induced primarily by dodecane. The POX4-encoded isozyme demonstrated a broad substrate spectrum in comparison with the narrow-spectrum, long-chain oxidase encoded by POX5. The absence of detectable acyl-CoA oxidase activity in the strain in which all POX4 and POX5 genes had been disrupted confirmed that all functional acyl-CoA oxidase genes had been inactivated. This strain cannot utilize alkanes or fatty acids for growth, indicating that the beta-oxidation pathway has been functionally blocked." @default.
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- W1834817612 date "1991-09-01" @default.
- W1834817612 modified "2023-10-14" @default.
- W1834817612 title "Determination of Candida tropicalis acyl coenzyme A oxidase isozyme function by sequential gene disruption" @default.
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- W1834817612 doi "https://doi.org/10.1128/mcb.11.9.4333-4339.1991" @default.
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