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Biochemical characterization of acetyl-CoA:1-alkyl-2-lyso-sn-glycero-3-phosphocholine acetyltransferase in rat spleen microsomes

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Lipids

Abstract

Acetyl-CoA:1-alkyl-2-lyso-sn-glycero-3-phosphocholine (lyso-PAF) ultrasonic disruption in the presence of 25% glycerol from rat spleen microsomes. About 26% of the enzymatic activity was recovered in the 225,000×g supernatant by this treatment, although the specific activity was slightly decreased compared with the original microsomes. The solubilized enzyme was remarkably susceptible to various kinds of metal ions. Sulfhydryl reagents such as p-chloromercuribenzoate and N-ethyl-maleimide significantly inhibited the enzyme reaction, suggesting that the enzyme is an SH enzyme. Based on the sedimentation pattern in sucrose density centrifugation, the isoelectric point, the kinetic characteristics and the sensitivity to tryptic digestion of microsomes, it appears that acetyl-CoA:lyso-PAF acetyltransferase does not differ from the acetyltransferase responsible for the transfer of acetate from acetyl-CoA to 1-acyl-2-lyso-sn-glycero-3-phosphocholine.

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Authors and Affiliations

  1. Department of Biochemistry, Hokkaido University School of Medicine, 060, Sapporo, Japan

    Kuniaki Seyama & Teruo Ishibashi

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  1. Kuniaki Seyama
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  2. Teruo Ishibashi
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Seyama, K., Ishibashi, T. Biochemical characterization of acetyl-CoA:1-alkyl-2-lyso-sn-glycero-3-phosphocholine acetyltransferase in rat spleen microsomes. Lipids 22, 185–189 (1987). https://doi.org/10.1007/BF02537300

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  • DOI: https://doi.org/10.1007/BF02537300

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