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Fatty acids resources:

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Lung. 1999;177(3):127-38.
Influence of phospholipid composition on the properties of reconstituted surfactants.

Dhand R, Young J, Krishnasamy S, Possmayer F, Gross NJ.

Division of Pulmonary and Critical Care Medicine, Edward Hines Jr. Veterans Affairs Hospital and Loyola University of Chicago Stritch School of Medicine, Hines, IL 60141, USA.

The influence of phospholipids on the ultrastructure and metabolism of reconstituted surfactants has not been well defined. The aim of this study was to determine if changes in the phospholipid composition of reconstituted surfactants altered their biophysical properties, ultrastructure, and conversion to light subtype by cycling. We prepared various surfactants containing radiolabeled dipalmitoylphosphatidylcholine ([14C]DPPC). The addition of phosphatidylglycerol (PG) or dipalmitoylphosphatidic acid (PA) to DPPC increased conversion to light subtype. In contrast, the addition of dipalmitoylphosphatidylglycerol (DPPG) to DPPC markedly reduced conversion to light subtype on cycling. DPPC and DPPC+PG produced large liposomes ( approximately 1,000 nm), whereas DPPC+PA or DPPC+DPPG formed multilamellar membranes. Mixtures of DPPC and PA were highly surface active in vitro, whereas the surface activity of DPPC+DPPG was similar to that of DPPC. In conclusion, the ultrastructure, metabolism, and surface active properties of DPPC+PG mixtures were influenced markedly by alterations in the fatty acid composition or polar head group of PG.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10192760&dopt=Abstract

Plant Physiol. 1994 Mar;104(3):845-855.
Apparent Role of Phosphatidylcholine in the Metabolism of Petroselinic Acid in Developing Umbelliferae Endosperm.

Cahoon EB, Ohlrogge JB.

Department of Botany and Plant Pathology, Michigan State University, East Lansing, Michigan 48824.

Studies were conducted to characterize the metabolism of the unusual fatty acid petroselinic acid (18:1cis[delta]6) in developing endosperm of the Umbelliferae species coriander (Coriandrum sativum L.) and carrot (Daucus carota L.). Analyses of fatty acid compositions of glycerolipids of these tissues revealed a dissimilar distribution of petroselinic acid in triacylglycerols (TAG) and the major polar lipids phosphatidylcholine (PC) and phosphatidylethanolamine (PE). Petroselinic acid comprised 70 to 75 mol% of the fatty acids of TAG but only 9 to 20 mol% of the fatty acids of PC and PE. Although such data appeared to suggest that petroselinic acid is at least partially excluded from polar lipids, results of [1-14C]acetate radiolabeling experiments gave a much different picture of the metabolism of this fatty acid. In time-course labeling of carrot endosperm, [1-14C]acetate was rapidly incorporated into PC in high levels. Through 30 min, radiolabel was most concentrated in PC, and of this, 80 to 85% was in the form of petroselinic acid. One explanation for the large disparity in amounts of petroselinic acid in PC as determined by fatty acid mass analyses and 14C radiolabeling is that turnover of these lipids or the fatty acids of these lipids results in relatively low accumulation of petroselinic acid mass. Consistent with this, the kinetics of [1-14C]acetate time-course labeling of carrot endosperm and "pulse-chase" labeling of coriander endosperm suggested a possible flux of fatty acids from PC into TAG. In time-course experiments, radiolabel initially entered PC at the highest rates but accumulated in TAG at later time points. Similarly, in pulse-chase studies, losses in absolute amounts of radioactivity from PC were accompanied by significant increases of radiolabel in TAG. In addition, stereospecific analyses of unlabeled and [1-14C]acetate-labeled PC of coriander endosperm indicated that petroselinic acid can be readily incorporated into both the sn-1 and sn-2 positions of this lipid. Because petroselinic acid is neither synthesized nor further modified on polar lipids, the apparent metabolism of this fatty acid through PC (and possibly through other polar lipids) may define a function of PC in TAG assembly apart from its involvement in fatty acid modification reactions.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12232131&dopt=Abstract [PubMed - as supplied by publisher]

Plant Physiol. 1994 Mar;104(3):889-898.
Interactions between Light and the Circadian Clock in the Regulation of CAT2 Expression in Arabidopsis.

Zhong HH, Young JC, Pease EA, Hangarter RP, McClung CR.

Department of Biological Sciences, Dartmouth College, Hanover, New Hampshire 03755-3576 (H.H.Z., E.A.P., C.R.M.).

In Arabidopsis seedlings germinated and grown in continuous light, CAT2 mRNA abundance peaks 1 d after imbibition, consistent with the role of catalase in detoxifying H2O2 generated during the [beta]-oxidation of fatty acids stored in the seed. A second peak of CAT2 mRNA abundance, of lower amplitude than the initial peak, appears 6 d after imbibition and may be associated with the development of photosynthetic competence and induction of photorespiration. This second peak in steady-state CAT2 mRNA abundance is regulated by light and is not seen in etiolated seedlings. CAT2 mRNA accumulation is induced by exposure to high-fluence blue or far-red light but not by red light. In addition, light induction is unaffected by several mutations that block blue light-mediated inhibition of hypocotyl elongation (blu1, blu2, blu3, hy4), suggesting phytochrome involvement. When etiolated seedlings are transferred to continuous white light, CAT2 mRNA rapidly (within 30 min) accumulates. It is interesting that in these seedlings CAT2 mRNA abundance undergoes pronounced oscillations with a circadian (24 h) periodicity, indicating control by the endogenous circadian clock. No such oscillations are detected in CAT2 mRNA abundance in etiolated seedlings prior to illumination. Control of CAT2 expression by the circadian clock is also seen in 5-week-old plants grown in a light-dark cycle and transferred either to continuous dark or to continuous light; in continuous light the circadian oscillations in CAT2 mRNA abundance persist for at least five circadian cycles, indicating the robustness of this circadian rhythm.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12232134&dopt=Abstract [PubMed - as supplied by publisher]

Plant Physiol. 1994 Mar;104(3):989-995.
Phosphopantethenylated Precursor Acyl Carrier Protein Is Imported into Spinach (Spinacia oleracea) Chloroplasts.

Savage LJ, Post-Beittenmiller D.

Department of Botany and Plant Pathology, Michigan State University, East Lansing, Michigan 48824-1312.

Acyl carrier protein (ACP) is an essential cofactor of fatty acid synthase. In plants, ACP is synthesized in the cytosol as a larger precursor protein and then is imported into the plastid where it is processed to a smaller mature form. The active form of ACP uses a covalently linked 4[prime]-phosphopantetheine prosthetic group derived from coenzyme A to covalently bind the acyl intermediates during fatty acid synthesis. The prosthetic group is added to ACP by holoACP synthase. This enzyme activity is associated with both the plastidial subcellular fraction and the soluble, or cytoplasmic, fraction. To gain further insight into potential in vivo pathways for the synthesis and maturation of ACP, in this study we examined whether precursor holoACP can be imported by isolated spinach (Spinacia oleracea) chloroplasts. Precursor holoACP containing a [35S]phosphopantetheine prosthetic group was prepared, and the radiolabel was used to demonstrate import of the phosphopantethenylated protein into isolated chloroplasts. In addition, timed chloroplast import assays indicated that in vitro import of the phosphopantethenylated protein is at least as efficient as import of the precursor apoprotein. Evidence was also obtained for a low level turnover of the prosthetic group among endogenous plastidial ACPs when coenzyme A was supplied exogenously.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12232143&dopt=Abstract [PubMed - as supplied by publisher]

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