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Updated: Apr 6, 2026

Application of Electrophysiology Measurement to Study the Activity of Electro-Neutral Transporters
Published on: February 3, 2018
Topological analysis of the Na+/H+ exchanger
Yongsheng Liu1, Arghya Basu1, Xiuju Li1
1Department of Biochemistry, University of Alberta, Edmonton, AB T6G 2H7, Canada.
The mammalian Na+/H+ exchanger isoform 1 (NHE1) structure was clarified using cysteine scanning and glycosylation studies. Results confirm NHE1
Area of Science:
- Biochemistry
- Cell Biology
- Membrane Protein Structure
Background:
- The Na+/H+ exchanger isoform 1 (NHE1) is a crucial integral membrane protein in mammalian cells.
- Understanding NHE1 structure is vital for elucidating its transport mechanism and developing disease treatments.
Purpose of the Study:
- To resolve conflicting models of the mammalian Na+/H+ exchanger isoform 1 (NHE1) structure.
- To determine the correct transmembrane topology of NHE1.
Main Methods:
- Cysteine scanning accessibility assays were employed to probe the NHE1 protein structure.
- Examination of glycosylation patterns on the mature NHE1 protein provided further structural insights.
Main Results:
- Experimental evidence supports a model where amino acids 1-127 form two transmembrane segments within the mature NHE1 protein.
- The segment between amino acids 315-411 was confirmed to be a single transmembrane segment.
Conclusions:
- The study validates a specific structural model for the mammalian Na+/H+ exchanger isoform 1 (NHE1).
- Accurate NHE1 topology is established, aiding future research on its function and inhibition.
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