Alcohol oxidation by isozyme 3a of liver microsomal cytochrome P-450

Minor J. Coon, Dennis Koop, Edward T. Morgan

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Liver microsomes from rabbits treated chronically with ethanol were solubilized and fractionated to yield a new isozyme of cytochrome P-450 in a homogeneous state. This cytochrome, designated as isozyme 3a on the basis of its relative electrophoretic mobility, is distinct from the known isozymes as judged by its spectral properties, minimal molecular weight, amino acid composition, and NH2- and COOH-terminal amino acid sequences. In addition, peptide mapping by high performance liquid chromatography following trypsinolysis indicates that form 3a is a unique gene product. This cytochrome has unusually high activity in the oxidation of ethanol and other alcohols to aldehydes and in the p-hydroxylation of aniline as compared with the other isozymes of P-450. The ethanol-oxidizing activity of isozyme 3a, which requires the presence of NADPH and NADPH-cytochrome P-450 reductase and is stimulated by the presence of phosphatidylcholine, is not due to contamination by catalase or an NAD+-or NADP+-dependent alcohol dehydrogenase.

Original languageEnglish (US)
Pages (from-to)177-180
Number of pages4
JournalPharmacology, Biochemistry and Behavior
Volume18
Issue numberSUPPL. 1
DOIs
StatePublished - 1983
Externally publishedYes

Fingerprint

Liver
Cytochrome P-450 Enzyme System
Isoenzymes
Alcohols
Oxidation
Ethanol
Cytochromes
Amino Acids
NADPH-Ferrihemoprotein Reductase
Electrophoretic mobility
Hydroxylation
Peptide Mapping
High performance liquid chromatography
Liver Microsomes
Phosphatidylcholines
NADP
Aldehydes
NAD
Catalase
Amino Acid Sequence

Keywords

  • Alcohol metabolism
  • Aniline p-hydroxylation
  • Cytochrome P-450
  • Ethanol oxidation

ASJC Scopus subject areas

  • Biochemistry
  • Behavioral Neuroscience
  • Pharmacology

Cite this

Alcohol oxidation by isozyme 3a of liver microsomal cytochrome P-450. / Coon, Minor J.; Koop, Dennis; Morgan, Edward T.

In: Pharmacology, Biochemistry and Behavior, Vol. 18, No. SUPPL. 1, 1983, p. 177-180.

Research output: Contribution to journalArticle

Coon, Minor J. ; Koop, Dennis ; Morgan, Edward T. / Alcohol oxidation by isozyme 3a of liver microsomal cytochrome P-450. In: Pharmacology, Biochemistry and Behavior. 1983 ; Vol. 18, No. SUPPL. 1. pp. 177-180.
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AB - Liver microsomes from rabbits treated chronically with ethanol were solubilized and fractionated to yield a new isozyme of cytochrome P-450 in a homogeneous state. This cytochrome, designated as isozyme 3a on the basis of its relative electrophoretic mobility, is distinct from the known isozymes as judged by its spectral properties, minimal molecular weight, amino acid composition, and NH2- and COOH-terminal amino acid sequences. In addition, peptide mapping by high performance liquid chromatography following trypsinolysis indicates that form 3a is a unique gene product. This cytochrome has unusually high activity in the oxidation of ethanol and other alcohols to aldehydes and in the p-hydroxylation of aniline as compared with the other isozymes of P-450. The ethanol-oxidizing activity of isozyme 3a, which requires the presence of NADPH and NADPH-cytochrome P-450 reductase and is stimulated by the presence of phosphatidylcholine, is not due to contamination by catalase or an NAD+-or NADP+-dependent alcohol dehydrogenase.

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