Thermotropic behaviour of membrane lipids from brown marine alga Laminaria japonica.
Microcalorimetry was used to show that transition-temperature ranges of phospho- and glycolipids of the brown marine alga Laminaria japonica were similar (from -62 to -47 degrees C up to 62-65 degrees C), except for monogalactosyldiacylglycerol, the low-temperature limit of which was shifted to -78 degrees C. As was shown by polarizing microscopy, the low-enthalpy peaks at temperatures of approx. 30-45 degrees C corresponded to isotropic melting of galactolipids and coincided with the high-temperature limit for photosynthetic and mitochondrial activity of the algae. As a whole, a classical interrelation was observed between thermotropic behaviour and the fatty acid unsaturation of lipids.
Sanina
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NM
Academy of Ecology, Marine Biology and Biotechnology, Department of Biochemistry and Biotechnology, Far Eastern State University, Sukhanova st.8. Vladivostok, 690600, Russia. sanina@bio.dvgu.ru
Kostetsky
E Y
EY
Goncharova
S N
SN
D000064:Acclimatization; D002152:Calorimetry, Differential Scanning; D004075:Diglycerides / Q000032:analysis; D005227:Fatty Acids / Q000032:analysis*; D005231:Fatty Acids, Unsaturated / Q000032:analysis; D038983:Galactolipids; D006017:Glycolipids / Q000032:analysis / Q000737:chemistry / Q000378:metabolism*; D008563:Membrane Lipids / Q000737:chemistry / Q000378:metabolism*; D000459:Phaeophyceae / Q000502:physiology*; D010743:Phospholipids / Q000737:chemistry / Q000378:metabolism*; D012623:Seawater; D013696:Temperature
D004075:Diglycerides; D005227:Fatty Acids; D005231:Fatty Acids, Unsaturated; D038983:Galactolipids; D006017:Glycolipids; D008563:Membrane Lipids; D010743:Phospholipids; C007388:digalactosyldiacylglycerol; C009909:monogalactosyldiacylglycerol; C013694:sulfoquinovosyl diglyceride