Differential effects of amino-terminal distal and proximal domains in the regulation of human erg K(+) channel gating.
The participation of amino-terminal domains in human ether-a-go-go (eag)-related gene (HERG) K(+) channel gating was studied using deleted channel variants expressed in Xenopus oocytes. Selective deletion of the HERG-specific sequence (HERG Delta138-373) located between the conserved initial amino terminus (the eag or PAS domain) and the first transmembrane helix accelerates channel activation and shifts its voltage dependence to hyperpolarized values. However, deactivation time constants from fully activated states and channel inactivation remain almost unaltered after the deletion. The deletion effects are equally manifested in channel variants lacking inactivation. The characteristics of constructs lacking only about half of the HERG-specific domain (Delta223-373) or a short stretch of 19 residues (Delta355-373) suggest that the role of this domain is not related exclusively to its length, but also to the presence of specific sequences near the channel core. Deletion-induced effects are partially reversed by the additional elimination of the eag domain. Thus the particular combination of HERG-specific and eag domains determines two important HERG features: the slow activation essential for neuronal spike-frequency adaptation and maintenance of the cardiac action potential plateau, and the slow deactivation contributing to HERG inward rectification.
Viloria
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CG
Departamento de Bioquímica y Biología Molecular, Facultad de Medicina, C/J Clavería s/n, Universidad de Oviedo, E-33006 Oviedo, Spain.
Barros
F
F
Giráldez
T
T
Gómez-Varela
D
D
de la Peña
P
P
D000595:Amino Acid Sequence / Q000235:genetics; D000818:Animals; D027682:Cation Transport Proteins; D004268:DNA-Binding Proteins; D000072237:ERG1 Potassium Channel; D051638:Ether-A-Go-Go Potassium Channels; D006801:Humans; D015640:Ion Channel Gating / Q000235:genetics*; D008133:Long QT Syndrome / Q000378:metabolism; D008564:Membrane Potentials / Q000235:genetics; D016297:Mutagenesis, Site-Directed; D009865:Oocytes / Q000378:metabolism; D018408:Patch-Clamp Techniques; D015221:Potassium Channels / Q000235:genetics / Q000378:metabolism*; D024642:Potassium Channels, Voltage-Gated; D017510:Protein Folding; D017434:Protein Structure, Tertiary / Q000235:genetics; D017384:Sequence Deletion; D015534:Trans-Activators; D000071230:Transcriptional Regulator ERG; D014981:Xenopus
D027682:Cation Transport Proteins; D004268:DNA-Binding Proteins; C072312:ERG protein, human; D000072237:ERG1 Potassium Channel; D051638:Ether-A-Go-Go Potassium Channels; C000606913:KCNH2 protein, human; C092509:KCNH6 protein, human; D015221:Potassium Channels; D024642:Potassium Channels, Voltage-Gated; D015534:Trans-Activators; D000071230:Transcriptional Regulator ERG