Protein-lipid interactions in antipodal plasma membranes of rat colonocytes.

Protein-lipid interactions in antipodal plasma membranes of rat colonocytes.
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大鼠结肠细胞反足质膜中的蛋白质-脂质相互作用。

DOI:
10.1016/0005-2736(84)90093-2
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发表时间:
1984
期刊:
Biochimica et biophysica acta
影响因子:
--
通讯作者:
Keresztes,RS
Keresztes,RS
中科院分区:
--
文献类型:
--
作者:
Brasitus,TA;Keresztes,RS

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本文报道了从大鼠近端结肠上皮细胞中分离顶膜的方法。差速离心法得到一种“粗制”的膜组分,用蔗糖密度离心法进一步纯化。最终的膜组分在碱性磷酸酶和半胱氨酸敏感的碱性磷酸酶比活性上比匀浆增加了20-28倍。从结肠细胞制备的顶膜和基侧膜的脂-蛋白相互作用和脂质动力学研究表明:(1)稳态荧光偏振研究表明,顶膜具有低的脂质流动性;(2)结肠基侧膜具有比顶膜更大的脂流动性;(3)这些反脚膜的组成差异似乎解释了这些脂流动性的差异;(4)用二苯基己三烯进行的荧光偏振研究发现,这些膜的顶膜和脂质体在21-23℃发生了热致转变;(5)碱性磷酸酶和l-半胱氨酸敏感的碱性磷酸酶活性似乎在功能上依赖于顶膜脂质的物理状态。
The isolation of apical membranes from rat proximal colonic epithelial cells is described. Differential centrifugation yielded a ‘crude’ membrane fraction which was further purified using sucrose density centrifugation. The final membrane fraction was enriched 20–28-fold over homogenate in alkaline phosphatase and cysteine-sensitive alkaline phosphatase specific activities. Lipid-protein interactions and lipid dynamics examined in apical and basolateral membranes prepared from colonocytes demonstrated: (1) apical membrane, as assessed by steady-state fluorescence polarization studies have a low lipid fluidity; (2) colonic basolateral membranes possess a greater lipid fluidity than apical membranes; (3) compositional differences in these antipodal membranes appear to explain these differences in lipid fluidity; (4) fluorescence polarization studies using diphenylhexatriene detect a thermotropic transition at 21–23°C in apical membranes and liposomes prepared from lipid extracts of these membranes; (5) alkaline phosphatase andl-cysteine-sensitive alkaline phosphatase activities appear to be functionally dependent on the physical state of the apical membrane's lipid.
膜脂可以调节大鼠肠微绒毛膜的鸟苷酸环化酶活性。
DOI: --
发表时间: 1980
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