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Updated: Jan 17, 2026

Study of the Functions and Activities of Neuronal K-Cl Co-Transporter KCC2 Using Western Blotting
Published on: December 9, 2022
N-glycosylation modulates the inactivation kinetics of the Kv3.4 ion channel
Rajnish Ranjan1,2, Emmanuelle Logette1, Mirjia Herzog1
1Blue Brain Project, Ecole Polytechnique Fédérale de Lausanne (EPFL), Campus Biotech, 1202 Geneva, Switzerland.
Abstract:
In our previous study, when mapping the kinetics of all 40 genetic subtypes of the voltage-gated potassium (Kv) family of ion channels, we observed significant heterogeneity in the inactivation delay of Kv3.4. Kv3.4 enables high-frequency firing in excitable cells and is linked to disorders such as Alzheimer's disease, epilepsy, chronic pain, and cardiovascular disease. In this study, we found that N-glycosylation, a co- and post-translational process of adding glycans branches to proteins, is a key mechanism that causes heterogeneity in the inactivation delay of Kv3.4 ion channel. Additionally, we discovered that changes in glucose availability directly affect N-glycosylation and the kinetics of Kv3.4, along with other N-glycosylated Kvs, making glucose a key regulator of Kv activity and, consequently, cell excitability. We propose that disruptions in N-glycosylation of Kv3.4 ion channels may play a role in neurological disorders linked to impaired glucose metabolism.
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