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PLANT PHYSIOLOGY , Vol 107, Issue 3 953-962, Copyright © 1995 by American Society of Plant Biologists
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BIOCHEMISTRY AND ENZYMOLOGY |
Plant Microsomal Phospholipid Acyl Hydrolases Have Selectivities for Uncommon Fatty Acids
U. Stahl, A. Banas and S. Stymne
Department of Plant Physiology, Swedish University of Agricultural Science, Box 7047, S-75007 Uppsala, Sweden (U.S., S.S.)
Developing endosperms and embryos accumulating triacylglycerols rich in
caproyl (decanoyl) groups (i.e. developing embryos of Cuphea procumbens and
Ulmus glabra) had microsomal acyl hydrolases with high selectivities toward
phosphatidylcholine with this acyl group. Similarly, membranes from
Euphorbia lagascae and Ricinus communis endosperms, which accumulate
triacylglycerols with vernoleate (12-epoxy-octadeca-9-enoate) and
ricinoleate (12-hydroxy-octadeca-9-enoate), respectively, had acyl
hydrolases that selectively removed their respective oxygenated acyl group
from the phospholipids. The activities toward phospholipid substrates with
epoxy, hydroxy, and medium-chain acyl groups varied greatly between
microsomal preparations from different plant species. Epoxidated and
hydroxylated acyl groups in sn-1 and sn-2 positions of phosphatidylcholine
and in sn-1-lysophosphatidylcholine were hydrolyzed to a similar extent,
whereas the hydrolysis of caproyl groups was highly dependent on the
positional localization.
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