Journal Article

Anaerobiosis induces complex changes in sterol esterification pattern in the yeast <i>Saccharomyces cerevisiae</i>

Martin Valachovič, Lucia Hronská and Ivan Hapala

in FEMS Microbiology Letters

Volume 197, issue 1, pages 41-45
Published in print April 2001 |
Published online January 2006 | e-ISSN: 1574-6968 | DOI: http://dx.doi.org/10.1111/j.1574-6968.2001.tb10580.x

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Abstract

Yeast Saccharomyces cerevisiae is auxotrophic for ergosterol in the absence of oxygen. We showed that complex changes in esterification of exogenously supplied sterols were also induced by anaerobiosis. Utilization of oleic acid for sterol esterification was significantly impaired in anaerobic cells. Furthermore, anaerobic cells fed different sterols exhibited striking variation in esterification efficiency (high levels of sterol esters for cholesterol and sitosterol, low levels for ergosterol, lanosterol or stigmasterol). Relative activities of two yeast acylCoA:sterol acyltransferases (Are1p and Are2p) changed in response to anaerobiosis: while Are2p was dominant under aerobic conditions, Are1p provided the major activity in the absence of oxygen. Our results indicate that sterol esters may fulfil different roles in aerobic and anaerobic cells.

Keywords: Yeast; Anaerobiosis; AcylCoA:sterol acyltransferase; Sterol ester; Saccharomyces cerevisiae

Journal Article.  2634 words.  Illustrated.

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