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Tectonics of a K(+) channel: The importance of the N-terminus for channel gating.

Hoffgaard, Franziska and Kast, S. M. and Moroni, Anna and Thiel, Gerhard and Hamacher, Kay (2015):
Tectonics of a K(+) channel: The importance of the N-terminus for channel gating.
In: Biochimica et biophysica acta, pp. 3197-3204, 1848, (12), ISSN 0006-3002,
[Article]

Abstract

The small K(+) channel Kcv represents the pore module of complex potassium channels. It was found that its gating can be modified by sensor domains, which are N-terminally coupled to the pore. This implies that the short N-terminus of the channel can transmit conformational changes from upstream sensors to the channel gates. To understand the functional role of the N-teminus in the context of the entire channel protein, we apply combinatorial screening of the mechanical coupling and long-range interactions in the Kcv potassium channel by reduced molecular models. The dynamics and mechanical connections in the channel complex shows that the N-terminus is indeed mechanically connected to the pore domain. This includes a long rang coupling to the pore and the inner and outer transmembrane domains. Since the latter domains host the two gates of the channel, the data support the hypothesis that mechanical perturbation of the N-terminus can be transmitted to the channel gates. This effect is solely determined by the topology of the channel; sequence details only have an implicit effect on the coarse-grained dynamics via the fold and not through biochemical details at a smaller scale. This observation has important implications for engineering of synthetic channels on the basis of a K(+) channel pore.

Item Type: Article
Erschienen: 2015
Creators: Hoffgaard, Franziska and Kast, S. M. and Moroni, Anna and Thiel, Gerhard and Hamacher, Kay
Title: Tectonics of a K(+) channel: The importance of the N-terminus for channel gating.
Language: English
Abstract:

The small K(+) channel Kcv represents the pore module of complex potassium channels. It was found that its gating can be modified by sensor domains, which are N-terminally coupled to the pore. This implies that the short N-terminus of the channel can transmit conformational changes from upstream sensors to the channel gates. To understand the functional role of the N-teminus in the context of the entire channel protein, we apply combinatorial screening of the mechanical coupling and long-range interactions in the Kcv potassium channel by reduced molecular models. The dynamics and mechanical connections in the channel complex shows that the N-terminus is indeed mechanically connected to the pore domain. This includes a long rang coupling to the pore and the inner and outer transmembrane domains. Since the latter domains host the two gates of the channel, the data support the hypothesis that mechanical perturbation of the N-terminus can be transmitted to the channel gates. This effect is solely determined by the topology of the channel; sequence details only have an implicit effect on the coarse-grained dynamics via the fold and not through biochemical details at a smaller scale. This observation has important implications for engineering of synthetic channels on the basis of a K(+) channel pore.

Journal or Publication Title: Biochimica et biophysica acta
Volume: 1848
Number: 12
Divisions: 10 Department of Biology
10 Department of Biology > Plant Membrane Biophysics
10 Department of Biology > Computational Biology and Simulation
Date Deposited: 01 Oct 2015 06:32
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