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Conference abstract, 2006

PSAT that catalyzes an acyl CoA-independent sterol ester formation may have a role in temperature acclimation of plants

Carlsson Anders, Szilagyi Anna, Noiriel Alexandre, Banas Antoni, Huang Bangquan, Åkerlund Hans-Erik, Schaller Hubert, Bouciwe-Navè Pierette, Stymne Sten


The first plant gene (At1g04010) encoding a sterol ester synthesising enzyme, the phospholipid:sterol acyltransferase (PSAT) has been identified in Arabidopsis and shown to belong to the LCAT/PDAT family (1). It is the first identified intracellular enzyme catalyzing the synthesis of sterol esters by an acyl CoA-independent reaction in which acyl groups are transacylated from phospholipids to sterols. The enzyme does not utilize neutral lipids, has highest activity with phosphatidylethanolamine, a five-fold preference for the sn-2 position and utilize both saturated and unsaturated fatty acids. The results presented implicate a role for AtPSAT in regulating both the amount and the quality of the free sterols in the membrane. Changes in fluorescence and pigment composition as well as the development of a chilling phenotype in the AtPSAT T-DNA knock after a switch to lower temperatures implies an importance of AtPSAT in temperature acclimation of plants

Published in


17th International symposium in Plant lipids

Authors' information

Swedish University of Agricultural Sciences, Department of Crop Science
Swedish University of Agricultural Sciences, Department of Crop Science
Bouciwe-Navè, Pierette
Szilagyi, Anna
Noiriel, Alexandre
Banas, Antoni
Huang, Bangquan
Åkerlund, Hans-Erik
Schaller, Hubert

UKÄ Subject classification

Agricultural Science
Food Science

URI (permanent link to this page)