Bréhélin Claire, Kessler Felix, van Wijk Klaas J
Laboratoire de Physiologie Végétale, Institut de Biologie, Université de Neuchâtel, Neuchâtel, Switzerland.
Trends Plant Sci. 2007 Jun;12(6):260-6. doi: 10.1016/j.tplants.2007.04.003. Epub 2007 May 10.
Plastoglobules are plastid-localized lipoprotein particles that contain tocopherols and other lipid isoprenoid-derived metabolites, as well as structural proteins named plastoglobulins. Surprisingly, recent publications show that plastoglobules contain enzymes involved in the metabolism of these secondary metabolites, as well as enzymes of unknown function. The size and number of plastoglobules vary during plastid development and differentiation, and strongly increase during light stress, senescence and in mutants blocked in thylakoid formation. Given that plastoglobules are contiguous with the outer lipid leaflet of the thylakoid membrane, it is highly plausible that a function of plastoglobules is the active channeling of lipid molecules and lipid breakdown products. Understanding the function of plastoglobules should provide a foundation for improving the nutritional value and yield of plants.
质体小球是定位于质体的脂蛋白颗粒，其中含有生育酚和其他类异戊二烯衍生的脂质代谢物，以及名为质体球蛋白的结构蛋白。令人惊讶的是，最近的出版物表明，质体小球含有参与这些次生代谢物代谢的酶，以及功能未知的酶。质体小球的大小和数量在质体发育和分化过程中会发生变化，并且在光胁迫、衰老以及类囊体形成受阻的突变体中会显著增加。鉴于质体小球与类囊体膜的外脂质小叶相邻，质体小球的一个功能很可能是脂质分子和脂质分解产物的主动运输。了解质体小球的功能应该为提高植物的营养价值和产量奠定基础。
