Outward Rectification of Voltage-Gated K+ Channels Evolved at Least Twice in Life History

Riedelsberger, Janin and Dreyer, Ingo and Gonzalez, Wendy (2015). Outward Rectification of Voltage-Gated K+ Channels Evolved at Least Twice in Life History. "Plos One", v. 10 (n. 9); pp. 1-17. ISSN 1932-6203. https://doi.org/10.1371/journal.pone.0137600.

Description

Title: Outward Rectification of Voltage-Gated K+ Channels Evolved at Least Twice in Life History
Author/s:
  • Riedelsberger, Janin
  • Dreyer, Ingo
  • Gonzalez, Wendy
Item Type: Article
Título de Revista/Publicación: Plos One
Date: September 2015
ISSN: 1932-6203
Volume: 10
Subjects:
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Biotecnología - Biología Vegetal
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Voltage-gated potassium (K+) channels are present in all living systems. Despite high structural similarities in the transmembrane domains (TMD), this K+ channel type segregates into at least two main functional categories—hyperpolarization-activated, inward-rectifying (Kin) and depolarization-activated, outward-rectifying (Kout) channels. Voltage-gated K+ channels sense the membrane voltage via a voltage-sensing domain that is connected to the conduction pathway of the channel. It has been shown that the voltage-sensing mechanism is the same in Kin and Kout channels, but its performance results in opposite pore conformations. It is not known how the different coupling of voltage-sensor and pore is implemented. Here, we studied sequence and structural data of voltage-gated K+ channels from animals and plants with emphasis on the property of opposite rectification. We identified structural hotspots that alone allow already the distinction between Kin and Kout channels. Among them is a loop between TMD S5 and the pore that is very short in animal Kout, longer in plant and animal Kin and the longest in plant Kout channels. In combination with further structural and phylogenetic analyses this finding suggests that outward-rectification evolved twice and independently in the animal and plant kingdom.

More information

Item ID: 41450
DC Identifier: http://oa.upm.es/41450/
OAI Identifier: oai:oa.upm.es:41450
DOI: 10.1371/journal.pone.0137600
Official URL: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0137600
Deposited by: Memoria Investigacion
Deposited on: 23 Jun 2016 15:12
Last Modified: 23 Jun 2016 15:12
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