Membrane lipids

（重定向自Membrane lipid）

Space-filling models of (a) sphingomyelin and (b) cholesterol.

Membrane lipids are a group of compounds (structurally similar to fats and oils) which form the double-layered surface of all cells (lipid bilayer). The three major classes of membrane lipids are phospholipids, glycolipids, and cholesterol. Lipids are amphiphilic: they have one end that is soluble in water ('polar') and an ending that is soluble in fat ('nonpolar'). By forming a double layer with the polar ends pointing outwards and the nonpolar ends pointing inwards membrane lipids can form a 'lipid bilayer' which keeps the watery interior of the cell separate from the watery exterior. The arrangements of lipids and various proteins, acting as receptors and channel pores in the membrane, control the entry and exit of other molecules and ions as part of the cell's metabolism. In order to perform physiological functions, membrane proteins are facilitated to rotate and diffuse laterally in two dimensional expanse of lipid bilayer by the presence of a shell of lipids closely attached to protein surface, called annular lipid shell.

单词	Membrane lipid
释义	Membrane lipid 英语例句库 Lipid bilayer Membrane lipids are amphipathic since they contain both hydriphilic and hydriphibic regions. 脂双层膜脂因为同时具有亲水基团和疏水基团而具有两亲性。 Membrane lipid microdomain is a newly discovered membrane confined domain which consists of sphingomyelin, choles terol , glycosphingolipid and many GPI anchored proteins. 脂微区为近年发现的广泛存在于质膜,主要由糖鞘脂、鞘磷脂、胆固醇及多GPI锚联蛋白组成的局限性结构域。英语百科 Membrane lipids （重定向自Membrane lipid） Membrane lipids are a group of compounds (structurally similar to fats and oils) which form the double-layered surface of all cells (lipid bilayer). The three major classes of membrane lipids are phospholipids, glycolipids, and cholesterol. Lipids are amphiphilic: they have one end that is soluble in water ('polar') and an ending that is soluble in fat ('nonpolar'). By forming a double layer with the polar ends pointing outwards and the nonpolar ends pointing inwards membrane lipids can form a 'lipid bilayer' which keeps the watery interior of the cell separate from the watery exterior. The arrangements of lipids and various proteins, acting as receptors and channel pores in the membrane, control the entry and exit of other molecules and ions as part of the cell's metabolism. In order to perform physiological functions, membrane proteins are facilitated to rotate and diffuse laterally in two dimensional expanse of lipid bilayer by the presence of a shell of lipids closely attached to protein surface, called annular lipid shell.
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