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pubmed-article:3756197pubmed:abstractTextGlycerol 3-phosphate acylation was studied in type II cells isolated from adult rat lung. The process was found to be largely microsomal. In the microsomes phosphatidic acid is the main product of glycerol 3-phosphate acylation. Glycerol-3-phosphate acyltransferase is rate limiting in the phosphatidic acid formation by the microsomes. Type II cell microsomes incorporate palmitoyl and oleoyl residues into phosphatidic acid at an equal rate if palmitoyl-CoA and oleoyl-CoA are added separately. However, if palmitoyl-CoA and oleoyl-CoA are added as an equimolar mixture the unsaturated fatty acyl moiety is incorporated much faster. Under the latter conditions monoenoic species constitute the most abundant products of glycerol 3-phosphate acylation. The microsomes incorporate both palmitoyl and oleoyl residues readily into both the 1- and 2-position of phosphatidic acid, even when palmitoyl-CoA and oleoyl-CoA are added together. Assuming that both phosphatidic acid phosphatase and cholinephosphotransferase do not discriminate against substrates with an unsaturated acyl moiety at the 1-position and a saturated acyl moiety at the 2-position, the last two observations indicate that a considerable percentage of phosphatidylcholine molecules synthesized de novo may have a saturated fatty acid at the 2-position and an unsaturated fatty acid at the 1-position, and that remodeling at the 1-position may be important for the formation of surfactant dipalmitoylphosphatidylcholine. They also indicate that type II cell microsomes are capable of synthesizing the dipalmitoyl species of phosphatidic acid. However, since there is a preference for the acylation of glycerol 3-phosphate with unsaturated fatty acyl residues, the percentage of dipalmitoyl species in the synthesized phosphatidic acid, and thereby the percentage of dipalmitoyl species in the phosphatidylcholine synthesized de novo, will probably depend on the relative availability of the various acyl-CoA species.lld:pubmed
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