Near-UV-induced absorbance change and photochemical decomposition of ergosterol in the plasma membrane of the yeast Saccharomyces cerevisiae.

Microbiology
Shin-Ichiro AramiMikiro Tada

Abstract

When cells of the yeast Saccharomyces cerevisiae were exposed to near-UV (300-400 nm), their absorption spectra changed slightly within the range 220-300 nm with increasing dosage. Difference spectra, calculated by substracting the curve recorded in cells exposed to near-UV from the curve of unexposed cells, decreased with increasing dosage over a broad band with peaks at 272, 282 and 295 nm and a shoulder at 265 nm. These peaks were in agreement with the absorption maxima of ergosterol, which is one of the major components of the plasma membrane of yeast. Near-UV radiation induced a simultaneous decrease in absorption spectra and reduction of ergosterol content in the plasma membrane. Photochemical decomposition of ergosterol by near-UV radiation was revealed in vivo, although ergosterol is generally known to be photoconverted to previtamin D2 industrially by UV radiation in vitro. In order to remove photosensitizers, liposomes were prepared from phospholipids and glycolipids, with or without ergosterol from purified yeast plasma membranes. Liposomal ergosterol in the orientated state was photochemically decomposed by near-UV radiation but ergosterol in the disorientated state in a homogeneous solution was not. Near-UV radiati...Continue Reading

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Citations

Apr 6, 2004·Journal of Controlled Release : Official Journal of the Controlled Release Society·Ozlem Oğün Cirli, Vasif Hasirci
Jun 18, 2003·International Journal of Food Microbiology·Kazuko TakeshitaMakoto Itoh
Jun 24, 2010·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Martín MolinéMaría van Broock
Dec 21, 2020·Journal of Bioscience and Bioengineering·Fatemeh-Rezaee AshtianiAbdeltif Amrane

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