期刊
NATURE STRUCTURAL & MOLECULAR BIOLOGY
卷 24, 期 10, 页码 857-+出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nsmb.3457
关键词
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资金
- National Institute of Diabetes and Digestive and Kidney Diseases [DK109919]
- National Institute of General Medical Sciences of the National Institutes of Health [GM055560]
C-type inactivation underlies important roles played by voltage-gated K+ (Kv) channels. Functional studies have provided strong evidence that a common underlying cause of this type of inactivation is an alteration near the extracellular end of the channel's ion-selectivity filter. Unlike N-type inactivation, which is known to reflect occlusion of the channel's intracellular end, the structural mechanism of C-type inactivation remains controversial and may have many detailed variations. Here we report that in voltage-gated Shaker K+ channels lacking N-type inactivation, a mutation enhancing inactivation disrupts the outermost K+ site in the selectivity filter. Furthermore, in a crystal structure of the Kv1.2-2.1 chimeric channel bearing the same mutation, the outermost K+ site, which is formed by eight carbonyl-oxygen atoms, appears to be slightly too small to readily accommodate a K+ ion and in fact exhibits little ion density; this structural finding is consistent with the functional hallmark of C-type inactivation.
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