SUMO co-expression modifies KV 11.1 channel activity
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SUMO co-expression modifies KV 11.1 channel activity. / Steffensen, Annette Buur; Andersen, Martin Nybo; Mutsaers, Nancy; Mujezinovic, Amer; Schmitt, Nicole.
In: Acta Physiologica (Print), Vol. 222, No. 3, e12974, 03.2018.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - SUMO co-expression modifies KV 11.1 channel activity
AU - Steffensen, Annette Buur
AU - Andersen, Martin Nybo
AU - Mutsaers, Nancy
AU - Mujezinovic, Amer
AU - Schmitt, Nicole
N1 - This article is protected by copyright. All rights reserved.
PY - 2018/3
Y1 - 2018/3
N2 - AIM: The voltage-gated potassium channel K V 11.1 is the molecular basis for the I K r current, which plays an important role in cardiac physiology. Its malfunction is associated with both inherited and acquired cardiac arrhythmias. Native currents differ from those in experimental models, suggesting additional regulatory mechanisms. We hypothesized that the post-translational modification sumoylation fine-tunes channel activity. METHODS: The functional effects of sumoylation on K V 11.1 were addressed by employing two-electrode voltage-clamp (TEVC) experiments in Xenopus laevis oocytes. Site-directed mutagenesis enabled a further analysis of the SUMO-target amino acids. We assessed protein expression levels and used confocal imaging for localization studies. RESULTS: Co-expression with Ubc9 and SUMO alters the electrophysiological properties of K V 11.1 leading to a decrease in steady-state current amplitude largely due to faster inactivation and alteration of deactivation kinetics. We identified three lysines (K21, K93 and K116) in the PAS domain as the putative SUMO-targets. CONCLUSION: This study indicates K V 11.1 as a sumoylation target and offers three main targets: K21, K93, and K116. Furthermore, it proposes an underlying mechanism for the observed kinetic impact of the PAS domain.
AB - AIM: The voltage-gated potassium channel K V 11.1 is the molecular basis for the I K r current, which plays an important role in cardiac physiology. Its malfunction is associated with both inherited and acquired cardiac arrhythmias. Native currents differ from those in experimental models, suggesting additional regulatory mechanisms. We hypothesized that the post-translational modification sumoylation fine-tunes channel activity. METHODS: The functional effects of sumoylation on K V 11.1 were addressed by employing two-electrode voltage-clamp (TEVC) experiments in Xenopus laevis oocytes. Site-directed mutagenesis enabled a further analysis of the SUMO-target amino acids. We assessed protein expression levels and used confocal imaging for localization studies. RESULTS: Co-expression with Ubc9 and SUMO alters the electrophysiological properties of K V 11.1 leading to a decrease in steady-state current amplitude largely due to faster inactivation and alteration of deactivation kinetics. We identified three lysines (K21, K93 and K116) in the PAS domain as the putative SUMO-targets. CONCLUSION: This study indicates K V 11.1 as a sumoylation target and offers three main targets: K21, K93, and K116. Furthermore, it proposes an underlying mechanism for the observed kinetic impact of the PAS domain.
KW - Journal Article
U2 - 10.1111/apha.12974
DO - 10.1111/apha.12974
M3 - Journal article
C2 - 28888063
VL - 222
JO - Acta Physiologica
JF - Acta Physiologica
SN - 1748-1708
IS - 3
M1 - e12974
ER -
ID: 183762890