UoM Cell Metabolism Lecture 11-15 Lipids and Plant Lipids (Year 2, Sem 2, 2017)

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We know there are two pathway of DAG synthesis (De novo or PC derived). The PC derived pathway is basically just the way that the plant modifies the FA to PC then back to DAG. Order the steps in this pathway and subsequent formation of TAG (there are two main enzymes to remember in this pathway, and the DAG to TAG relevant enzymes)

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The created TAG can be converted back as it is a reversible reaction but the lyso-PC is converted back to PC by Lyso-PC DAG acyltransferase (LPC AT)

De novo formed DAG (from glycerol-3-phosphate, then lysophosphatidic acid, then phosphatidic acid then DAG)

Reversible CPT forms the new Diacylglycerol (different FA chains) or reversible PDCT

Converted to phosphatidylcholine by CPT (CDT-choline:DAG cholinephosphotransferase) or PDCT (phosphatidylcholine:DAG cholinephosphotransferase)

The modified molecule is turned into TAG by phospholipid:diacylglycerol acyltransferase (reversible) using PC which is itself converted to lyso-PC.

This is modified to a new phosphatidylcholine via desaturation


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