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THE PLANT CELL, Vol 7, Issue 3 359-371, Copyright © 1995 by American Society of Plant Biologists
Palmitoyl-Acyl Carrier Protein (ACP) Thioesterase and the Evolutionary Origin of Plant Acyl-ACP Thioesterases
A. Jones, H. M. Davies and T. A. Voelker
Calgene, Inc., 1920 Fifth Street, Davis, California 95616
Acyl-acyl carrier protein (ACP) thioesterases play an essential role in
chain termination during de novo fatty acid synthesis and in the channeling
of carbon flux between the two lipid biosynthesis pathways in plants. We
have discovered that there are two distinct but related thioesterase gene
classes in higher plants, termed FatA and FatB, whose evolutionary
divergence appears to be ancient. FatA encodes the already described
18:1-ACP thioesterase. In contrast, FatB representatives encode
thioesterases preferring acyl-ACPs having saturated acyl groups. We
unexpectedly obtained a 16:0-ACP thioesterase cDNA from Cuphea hookeriana
seed, which accumulate predominantly 8:0 and 10:0. The 16:0 thioesterase
transcripts were found in non-seed tissues, and expression in transgenic
Brassica napus led to the production of a 16:0-rich oil. We present
evidence that this type of FatB gene is ancient and ubiquitous in plants
and that specialized plant medium-chain thioesterases have evolved
independently from such enzymes several times during angiosperm evolution.
Also, the ubiquitous 18:1-ACP thioesterase appears to be a derivative of a
16:0 thioesterase.
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