Spontaneous transfer of retinoic acid, retinyl acetate, and retinyl palmitate between single unilamellar vesicles

M. T.P. Ho, Henry J. Pownall, J. G. Hollyfield

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

The transfer of retinoic acid, retinyl acetate, and retinyl palmitate between single unilamellar vesicles was studied by resonance energy transfer. The retinoic acid transfers spontaneously between single unilamellar vesicles with a first order rate constant of 9.6 s-1 at 15 °C and pH 7.4. At 30 °C, the transfer rate was 3.5 times faster than that at 10 °C. At pH 7.4, the transfer rate was almost 2 orders of magnitude faster than that observed at pH 1.6. Increasing the concentration of NaCl decreased the retinoic acid transfer rate significantly. Retinyl acetate transfers with a rate constant of 0.15 s-1, but no spontaneous transfer of retinyl palmitate was observed over 60 min. The evidence supports the proposal that retinoic acid and retinyl acetate transfer between single unilamellar vesicles occur via the aqueous phase. In contrast, no spontaneous transfer of retinyl palmitate was observed. However, linear free energy relationships and the thermodynamic parameters for retinyl acetate transfer permit the calculation of rate constant for retinyl palmitate transfer.

Original languageEnglish (US)
Pages (from-to)17759-17763
Number of pages5
JournalJournal of Biological Chemistry
Volume264
Issue number30
StatePublished - 1989

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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