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首页> 外文期刊>Phycological Research >Temperature modulation and the presence of C-20 fatty acids in mono- and digalactosyldiacylglycerol of Euglena gracilis and Lepocinclis acus: A modern interpretation of euglenid galactolipids using positive-ion electrospray ionization/mass spectrometry
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Temperature modulation and the presence of C-20 fatty acids in mono- and digalactosyldiacylglycerol of Euglena gracilis and Lepocinclis acus: A modern interpretation of euglenid galactolipids using positive-ion electrospray ionization/mass spectrometry

机译：温度调节和Euglena gracilis和Lepocinclis acus的单和半乳糖基二酰基甘油中C-20脂肪酸的存在：使用正离子电喷雾电离/质谱法对半乳糖半乳糖脂的现代解释

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摘要

Mono- and digalactosyldiacylglycerol (MGDG and DGDG, respectively) are important galactolipids that comprise photosynthetic membranes in almost all photosynthetic organisms. Intact forms of MGDG and DGDG of Euglena gracilis and Lepocinclis acus, two example euglenids with secondary plastids of green algal origin, were elucidated with fatty acid regiochemistry via positive-ion electrospray ionization/mass spectrometry at two growth temperatures. At 20 degrees C, E.gracilis and L.acus produced predominantly 18:3/16:4 (sn-1/sn-2) MGDG, whereas at 30 degrees C this was supplanted by 18:2/16:2 MGDG. At both temperatures were also observed a variety of other MGDG and DGDG forms, including C-20 fatty acid-containing forms not expected in a green algal-derived plastid. In addition to providing structural details of MGDG and DGDG not available in past studies, these results suggest a previously unknown relationship between these two organisms and the red algae. This study also illustrates that temperature modulation of galactolipids occurs via modification of unsaturation of both the sn-1 and sn-2 fatty acids; this is fundamentally different from previously published studies from our laboratory on other algal classes.
机译：单和二半乳糖基二酰基甘油（分别为MGDG和DGDG）是重要的半乳糖脂，在几乎所有光合生物中都包含光合膜。通过正离子电喷雾电离/质谱法在两个生长温度下用脂肪酸区域化学法阐明了裸露的裸藻和Lepocinclis acus MGDG和DGDG的完整形式，这是两个示例藻类，具有绿色藻类次生质体。在20摄氏度时，细粒肠杆菌和链球菌主要产生18：3/16：4（sn-1 / sn-2）MGDG，而在30摄氏度时，它被18：2/16：2 MGDG取代。在两个温度下，还观察到多种其他MGDG和DGDG形式，包括绿色藻类质体中未预期的含C-20脂肪酸形式。除了提供过去研究中未提供的MGDG和DGDG的结构细节外，这些结果还暗示了这两种生物与红藻之间以前未知的关系。这项研究还表明，半乳糖脂的温度调节是通过改变sn-1和sn-2脂肪酸的不饱和度来实现的。这与我们实验室先前发表的其他藻类研究根本不同。

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