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Food Lipids: Chemistry, Nutrition, and Biotechnology

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Table 6 Summary of Trends of Enzyme Selectivity <strong>and</strong>/or Involvement in Triacylglycerol Assembly in Oil-Bearing Plant Tissues Rich in<br />

Various Groups of Fatty Acids a<br />

Enzymic step<br />

(control point or<br />

feature)<br />

Unsaturated<br />

18-carbon fatty acids<br />

GPAT (sn-1-acyl) Broad specificity 1 ; selective<br />

toward 16:0/18:X-CoA<br />

LPAAT (sn-2-acyl) Selective toward<br />

unsaturated 18:X-CoA<br />

<strong>and</strong> 18:X-LPA 2<br />

PTAP Selective toward<br />

diunsaturated-PA<br />

DAGAT (sn-3-acyl) Broad specificity 3<br />

Copyright 2002 by Marcel Dekker, Inc. All Rights Reserved.<br />

Oil-bearing plant species/tissues accumulating triacylglycerols rich in<br />

Medium chain length<br />

(18 carbons) fatty acids<br />

Selective toward

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