Remodeling of Cardiolipin by Phospholipid Transacylation

Yang Xu, Richard I. Kelley, Thomas J J Blanck, Michael Schlame

Research output: Contribution to journalArticle

Abstract

Mitochondrial cardiolipin (CL) contains unique fatty acid patterns, but it is not known how the characteristic molecular species of CL are formed. We found a novel reaction that transfers acyl groups from phosphatidylcholine or phosphatidylethanolamine to CL in mitochondria of rat liver and human lymphoblasts. Acyl transfer was stimulated by ADP, ATP, and ATPγS, but not by other nucleotides. Coenzyme A stimulated the reaction only in the absence of adenine nucleotides. Free fatty acids were not incorporated into CL under the same incubation condition. The transacylation required addition of exogenous CL or monolyso-CL, whereas dilyso-CL was not a substrate. Transacylase activity was decreased in lymphoblasts from patients with Barth syndrome (tafazzin deletion), and this was accompanied by drastic changes in the molecular composition of CL. In rat liver, where linoleic acid was the most abundant residue of CL, only linoleoyl groups were transferred into CL, but not oleoyl or arachidonoyl groups. We demonstrated complete remodeling of tetraoleoyl-CL to tetralinoleoyl-CL in rat liver mitochondria and identified the intermediates linoleoyl-trioleoyl-CL, dilinoleoyl-dioleoyl-CL, and trilinoleoyl-oleoyl-CL by high-performance liquid chromatography. The data suggest that CL is remodeled by acyl specific phospholipid transacylation and that tafazzin is an acyltransferase involved in this mechanism.

Original languageEnglish (US)
Pages (from-to)51380-51385
Number of pages6
JournalJournal of Biological Chemistry
Volume278
Issue number51
DOIs
StatePublished - Dec 19 2003

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Cardiolipins
Phospholipids
Liver
Rats
Mitochondria
Liver Mitochondrion
Barth Syndrome
Acyltransferases
Adenine Nucleotides
High performance liquid chromatography
Linoleic Acid
Coenzyme A
Phosphatidylcholines
Nonesterified Fatty Acids

ASJC Scopus subject areas

  • Biochemistry

Cite this

Xu, Y., Kelley, R. I., Blanck, T. J. J., & Schlame, M. (2003). Remodeling of Cardiolipin by Phospholipid Transacylation. Journal of Biological Chemistry, 278(51), 51380-51385. https://doi.org/10.1074/jbc.M307382200

Remodeling of Cardiolipin by Phospholipid Transacylation. / Xu, Yang; Kelley, Richard I.; Blanck, Thomas J J; Schlame, Michael.

In: Journal of Biological Chemistry, Vol. 278, No. 51, 19.12.2003, p. 51380-51385.

Research output: Contribution to journalArticle

Xu, Y, Kelley, RI, Blanck, TJJ & Schlame, M 2003, 'Remodeling of Cardiolipin by Phospholipid Transacylation', Journal of Biological Chemistry, vol. 278, no. 51, pp. 51380-51385. https://doi.org/10.1074/jbc.M307382200
Xu, Yang ; Kelley, Richard I. ; Blanck, Thomas J J ; Schlame, Michael. / Remodeling of Cardiolipin by Phospholipid Transacylation. In: Journal of Biological Chemistry. 2003 ; Vol. 278, No. 51. pp. 51380-51385.
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