Linked Life Data

16663396

Source:http://linkedlifedata.com/resource/pubmed/id/16663396

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pubmed-article:16663396pubmed:dateCreated2010-6-29lld:pubmed
pubmed-article:16663396pubmed:abstractTextA detailed analysis of the low temperature-induced alterations of Dunaliella salina (UTEX 1644) microsomal membrane lipids was carried out. Microsomal membranes were isolated from cells grown at 30 degrees C, from cells shifted to 12 degrees C for 12 hours, and from cells acclimated to 12 degrees C. Fatty acid analyses of the major lipid classes demonstrated significant changes in the fatty acid composition of phosphatidylcholinemine (PE) and phosphatidylglycerol (PG) but not phosphatidylcholine (PC) during the initial 12 hours at low temperature. These changes did not entail enhanced desaturation of linoleic acid. Subsequent to 12 hours, the proportions of linolenic acid increased in all phospholipids.Molecular species analyses of the phospholipids demonstrated that the most immediate changes following a shift to low temperature were limited to several molecular species of PE and PG. The changes observed in PE included a decrease in C(30) species and concomitant increases in C(34) and C(36) species. Compositional changes associated with PG entailed the emergence of a new molecular species (18:1/18:1) not found at 30 degrees C. The retailoring of molecular species resulted in an increase in the number of species having two unsaturated acyl chains and did not reflect a simple enhancement of desaturase activity as suggested by the fatty acid analysis. We conclude that the initial alterations in response to low temperature stress involve discrete changes in certain molecular species. These and further alterations of molecular species following acclimation to low temperature would appear to augment increases in acyl chain desaturation as a means of modifying membrane properties in response to low temperature stress.lld:pubmed
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pubmed-article:16663396pubmed:authorpubmed-author:ThompsonG AGAlld:pubmed
pubmed-article:16663396pubmed:authorpubmed-author:LynchD VDVlld:pubmed
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pubmed-article:16663396pubmed:volume74lld:pubmed
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pubmed-article:16663396pubmed:pagination193-7lld:pubmed
pubmed-article:16663396pubmed:dateRevised2010-9-14lld:pubmed
pubmed-article:16663396pubmed:year1984lld:pubmed
pubmed-article:16663396pubmed:articleTitleMicrosomal Phospholipid Molecular Species Alterations during Low Temperature Acclimation in Dunaliella.lld:pubmed
pubmed-article:16663396pubmed:affiliationDepartment of Botany, The University of Texas, Austin, Texas 78712.lld:pubmed
pubmed-article:16663396pubmed:publicationTypeJournal Articlelld:pubmed
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