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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Rat liver peroxisomes catalyze the beta oxidation of fatty acids.

Peroxisomes were purified by differential and equilibrium density centrifugation from the livers of rats treated with clofibrate to enhance their peroxisomal system of fatty acid oxidation. These purified peroxisomes were tested for the presence of crotonase, beta-hydroxybutyryl-CoA dehydrogenase and thiolase using spectroscopic techniques that utilize the characteristic absorption bands of the appropriate 4-carbon acyl-CoA substrates. All three enzymes were found. Analysis of the fractions from equilibrium density centrifugation revealed major peaks of these enzyme activities in peroxisomes and excluded contamination by mitochondria as an explanation of the results. In the presence of excess CoA the purified peroxisomes oxidized palmitoyl-CoA to acetyl-CoA, and reduced NAD, with a 1:5:5 stoichiometry. The peroxisomes were inactive with butyryl-CoA and less active with octanoyl-CoA than with lauroyl-CoA or palmitoyl-CoA; they appear specialized for the beta oxidation of long chain fatty acids.[1]

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