Subcellular localization and capacity of β-oxidation and aldehyde dehydrogenase in porcine liver

Ken W Turteltaub, Patricia A. Murphy

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Abstract

Porcine hepatocyte organelles were separated by isopycnic sucrose gradient centrifugation from livers of 6-month-old Yorkshire pigs. The presence of a peroxisomal palmitoyl-CoA oxidizing system and a peroxisomal NAD:aldehyde dehydrogenase (ALDH) with high Km for acetaldehyde was demonstrated. Peroxisomal palmitate oxidizing capacity was found to be equal to that of the surviving mitochondria. The high Km isozyme of ALDH was mainly located in the mitochondria (54%), with a significant portion in the peroxisome (32%). Remaining activity is distributed among the microsomes (8.3%) and cytosol (4.6%). The low Km isozyme was confined almost exclusively to the mitochondria. ALDH may exist in the peroxisome as a detoxification mechanism and contribute to shorter half-lives of reactive aldehydes in the cell. Species differences are discussed.

Original languageEnglish (US)
Pages (from-to)120-126
Number of pages7
JournalArchives of Biochemistry and Biophysics
Volume255
Issue number1
DOIs
StatePublished - May 15 1987
Externally publishedYes

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ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

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