Different effects of the Ca2+-binding protein, KChIP1, on two Kv4 subfamily members, Kv4.1 and Kv4.2

被引:31
作者
Nakamura, TY [1 ]
Nandi, S [1 ]
Pountney, DJ [1 ]
Artman, M [1 ]
Rudy, B [1 ]
Coetzee, WA [1 ]
机构
[1] NYU, Sch Med, New York, NY 10016 USA
关键词
Kv4-subunit; K+ channel-interacting protein 1; regulatory subunit; molecular diversity; potassium channel;
D O I
10.1016/S0014-5793(01)02560-1
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 Ca2+-binding protein, K+ channel-interacting protein 1 (KChIP1), modulates Kv4 channels. We show here that KChIP1 affects Kv4.1 and Kv4.2 currents differently. KChIP1 slows Kv4.2 inactivation but accelerates the Kv4.1 inactivation time course. Kv4.2 activation is shifted in a hyperpolarizing direction, whereas a depolarizing shift occurs for Kv4,1, On the other hand, KChIP1 increases the current amplitudes and accelerates recovery from inactivation of both currents, An involvement of the Kv4 N-terminus in these differential effects is demonstrated using chimeras of Kv4.2 and Kv4.1, These results reveal a no, el interaction of KChIP1 with these two Kv4 members. This represents a mechanism to further increase the functional diversity of K+ channels. (C) 2001 Federation of European Biochemical Societies. Published by Elsevier Science B.V. All rights reserved.
引用
收藏
页码:205 / 209
页数:5
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