Isolation and Characterization of a New Phospholipid from Brown Algae. Intracellular Localization and Site of Biosynthesis
| Autor: | Christine E. Schmid, Dieter G. Müller, Waldemar Eichenberger |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
chemistry.chemical_classification
Phosphatidylethanolamine biology Physiology Ectocarpus siliculosus Phospholipid Fatty acid Plant Science Phosphoglyceride Ectocarpene biology.organism_classification chemistry.chemical_compound chemistry Biochemistry Diglyceride Agronomy and Crop Science Polyunsaturated fatty acid |
| Zdroj: | Journal of Plant Physiology. 143:570-574 |
| ISSN: | 0176-1617 |
| DOI: | 10.1016/s0176-1617(11)81826-2 |
| Popis: | Summary In various orders of brown algae a novel lipid constituent PX was detected and suggested to be a phosphoglyceride bearing an amino-containing polar head group. We discuss its tentative structure based on IR, NMR, MS and chemical data. PX accounted for 2–4% of total lipids and always exhibited a fatty acid composition rich in 20:4 (arachidonic) and 20:5 (eicosapentaenoic) acids. High proportions of these long-chain polyunsaturated acids implied a predominantly cytoplasmic biosynthesis of its diglyceride part. In Ectocarpus siliculosus (Phaeophyceae) PE has a fatty acid pattern similar to PX. In its gametes PX accumulates in the plasma membrane and, in addition, shows a characteristic sex-specific composition of its acyl moieties. In female plasma membranes the content of 20:5 acid is significantly higher than in male plasma membranes or whole plants. This is possibly due to 20:5 acid from PX acting as a direct precursor for pheromone biosynthesis. PX is suggested to be of special physiological importance in terms of an acyl donor in this process. The 20:5 pool in PX was estimated to be sufficient to synthesize 70% of the pheromone ectocarpene. |
| Databáze: | OpenAIRE |
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