X-ray structure of a voltage-dependent K+ channel - PubMed (original) (raw)
. 2003 May 1;423(6935):33-41.
doi: 10.1038/nature01580.
Affiliations
- PMID: 12721618
- DOI: 10.1038/nature01580
X-ray structure of a voltage-dependent K+ channel
Youxing Jiang et al. Nature. 2003.
Abstract
Voltage-dependent K+ channels are members of the family of voltage-dependent cation (K+, Na+ and Ca2+) channels that open and allow ion conduction in response to changes in cell membrane voltage. This form of gating underlies the generation of nerve and muscle action potentials, among other processes. Here we present the structure of KvAP, a voltage-dependent K+ channel from Aeropyrum pernix. We have determined a crystal structure of the full-length channel at a resolution of 3.2 A, and of the isolated voltage-sensor domain at 1.9 A, both in complex with monoclonal Fab fragments. The channel contains a central ion-conduction pore surrounded by voltage sensors, which form what we call 'voltage-sensor paddles'-hydrophobic, cationic, helix-turn-helix structures on the channel's outer perimeter. Flexible hinges suggest that the voltage-sensor paddles move in response to membrane voltage changes, carrying their positive charge across the membrane.
Comment in
- Structural biology: Life's transistors.
Sigworth FJ. Sigworth FJ. Nature. 2003 May 1;423(6935):21-2. doi: 10.1038/423021a. Nature. 2003. PMID: 12721605 No abstract available. - The voltage sensor of ion channels revealed.
Gregerson KA. Gregerson KA. Trends Endocrinol Metab. 2003 Aug;14(6):251-2. doi: 10.1016/s1043-2760(03)00110-3. Trends Endocrinol Metab. 2003. PMID: 12890583 No abstract available.
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