Carnitine palmitoyltransferase in human erythrocyte membrane. Properties and malonyl-CoA sensitivity

R. R. Ramsay*, G. Mancinelli, A. Arduini

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Carnitine palmitoyltransferase located in the erythrocyte plasma membrane is sensitive to inhibition by malonyl-CoA and 2-bromopalmitoyl-CoA plus carnitine. Although this inhibition and other properties suggest similarities to the intracellular enzymes in other tissues, no cross-reaction was observed with antisera to the peroxisomal or to the mitochondrial inner-membrane enzyme. The activity was solubilized by and was stable in Triton X-100, which destroys the enzymes found in microsomes and in the mitochondrial outer membrane. The substrate specificity is broader than for the intracellular enzymes, the activities with stearoyl-CoA (114%) and arachidonoyl-CoA (97%) being equal to that with palmitoyl-CoA, and the activities with linoleoyl-CoA (44%) and erucoyl-CoA (46%) about half that with palmitoyl-CoA. The function of this carnitine palmitoyltransferase is probably to buffer the acyl-CoA present in the erythrocyte for turnover of the fatty acyl groups of the membrane lipids.

Original languageEnglish
Pages (from-to)685-688
Number of pages4
JournalBiochemical Journal
Volume275
Issue number3
DOIs
Publication statusPublished - 1 Jan 1991

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