LIPID MODULATION OF NICOTINIC ACETYLCHOLINE-RECEPTOR FUNCTION - THE ROLE OF NEUTRAL AND NEGATIVELY CHARGED LIPIDS

被引:72
作者
SUNSHINE, C [1 ]
MCNAMEE, MG [1 ]
机构
[1] UNIV CALIF DAVIS,DEPT BIOCHEM & BIOPHYS,DAVIS,CA 95616
关键词
NICOTINIC ACETYLCHOLINE RECEPTOR; FOURIER TRANSFORM; ION FLUX RESPONSE; PROTEIN LIPID INTERACTION; CHOLESTEROL; AFFINITY-STATE TRANSITION; (T-CALIFORNICA);
D O I
10.1016/0005-2736(92)90031-G
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The effects of negatively charged and neutral lipids on the function of the reconstituted nicotinic acetylcholine receptor from Torpedo californica were determined with two assays using acetylcholine receptor-containing vesicles: the ion flux response and the affinity-state transition. The receptor was reconstituted into three different lipid environments, with and without neutral lipids: (1) phosphatidylcholine/phosphatidylserine; (2) phosphatidylcholine/phosphatidic acid; and (3) phosphatidylcholine/cardiolipin. Analysis of the ion flux responses showed that: (1) all three negatively charged lipid environments gave fully functional acetylcholine receptor ion channels, provided neutral lipids were added; (2) in each lipid environment, the neutral lipids tested were functionally equivalent to cholesterol; and (3) the rate of receptor desensitization depends upon the type of neutral lipid and negatively charged phospholipid reconstituted with the receptor. The functional effects of neutral and negatively charged lipids on the acetylcholine receptor are discussed in terms of protein-lipid interactions and stabilization of protein structure by lipids.
引用
收藏
页码:240 / 246
页数:7
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