OLIGOMERIC PROPERTIES OF ALPHA-DENDROTOXIN-SENSITIVE POTASSIUM-ION CHANNELS PURIFIED FROM BOVINE BRAIN

被引:127
作者
PARCEJ, DN [1 ]
SCOTT, VES [1 ]
DOLLY, JO [1 ]
机构
[1] UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,DEPT BIOCHEM,LONDON SW7 2AY,ENGLAND
关键词
D O I
10.1021/bi00160a018
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
Neuronal acceptors for alpha-dendrotoxin (alpha-DTX) have recently been purified from mammalian brain and shown to consist of two classes of subunit, a larger (almost-equal-to 78 000 M(r)) protein (alpha) whose N-terminal sequence is identical to that of a cloned, alpha-DTX-sensitive K+ channel, and a novel M(r) 39 000 (beta) polypeptide of unknown function. However, little information is available regarding the oligomeric composition of these native molecules. By sedimentation analysis of alpha-DTX acceptors isolated from bovine cortex, two species have been identified. A minority of these oligomers contain only the larger protein, while the vast majority possess both subunits. Based on accurate determination of the molecular weights of these two forms it is proposed that alpha-DTX-sensitive K+ channels exist as alpha4beta4 complexes because this combination gives the best fit to the experimental data.
引用
收藏
页码:11084 / 11088
页数:5
相关论文
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