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Glycerolipid labelling kinetics in isolated intact chloroplasts
The Biochemical Journal
|December 1, 1984
Summary
Glycerolipid synthesis in chloroplasts involves sequential acylation. Fatty acid incorporation into lipids depends on sn-glycerol 3-phosphate supply and plant species-specific acyltransferase activities.
Area of Science:
- Plant Biochemistry
- Lipid Metabolism
- Chloroplast Biology
Background:
- Glycerolipid synthesis is crucial for plant cell membranes.
- Intact chloroplasts are key sites for lipid synthesis.
Purpose of the Study:
- To investigate the pathway of glycerolipid synthesis in intact chloroplasts.
- To determine factors influencing the rate and composition of glycerolipid synthesis across different plant species.
Main Methods:
- Isolation of intact chloroplasts from three plant species.
- Monitoring the incorporation of *in situ* synthesized oleate into various lipid intermediates.
- Quantification of sn-glycerol 3-phosphate and lysophosphatidate levels.
Main Results:
- Confirmed sequential acylation of sn-glycerol 3-phosphate and lysophosphatidate.
- Lysophosphatidate was detected both initially and during synthesis.
- Glycerolipid synthesis rate was primarily dependent on sn-glycerol 3-phosphate availability.
- Acyltransferase activity varied between species, influencing fatty acid partitioning.
Conclusions:
- The supply of sn-glycerol 3-phosphate is a primary determinant of glycerolipid synthesis rates.
- Differential acyltransferase activities in chloroplasts of various plant species regulate fatty acid allocation into glycerolipids.