Demonstration of a Direct Interaction Between Sigma-1 Receptors and Acid-sensing Ion Channels
Overview
Affiliations
The sigma-1 receptor is a widely expressed protein that interacts with a variety of ion channels, including the acid-sensing ion channel (ASIC) 1a. Here we used atomic force microscopy to determine the architecture of the ASIC1a/sigma-1 receptor complex. When isolated His(8)-tagged ASIC1a was imaged in complex with anti-His(6) antibodies, the angle between pairs of bound antibodies was 135 degrees , consistent with the known trimeric structure of the channel. When ASIC1a was coexpressed with FLAG/His(6)-tagged sigma-1 receptor, ASIC1a became decorated with small particles, and pairs of these particles bound at an angle of 131 degrees . When these complexes were incubated with anti-FLAG antibodies, pairs of antibodies bound at an angle of 134 degrees , confirming that the small particles were sigma-1 receptors. Of interest, we found that the sigma-1 receptor ligand haloperidol caused an approximately 50% reduction in ASIC1a/sigma-receptor binding, suggesting a way in which sigma-1 ligands might modulate channel properties. For the first time, to our knowledge, we have resolved the structure of a complex between the sigma-1 receptor and a target ion channel, and demonstrated that the stoichiometry of the interaction is 1 sigma-1 receptor/1 ASIC1a subunit.
Zhao F, Yang T, Zhou L, Li R, Liu J, Zhao J Aging (Albany NY). 2023; 15(10):4182-4201.
PMID: 37199665 PMC: 10258007. DOI: 10.18632/aging.204721.
Munguia-Galaviz F, Miranda-Diaz A, Cardenas-Sosa M, Echavarria R Int J Mol Sci. 2023; 24(3).
PMID: 36768323 PMC: 9916216. DOI: 10.3390/ijms24031997.
Alvarez-Perez B, Bago-Mas A, Deulofeu M, Vela J, Merlos M, Verdu E Int J Mol Sci. 2022; 23(19).
PMID: 36233233 PMC: 9569697. DOI: 10.3390/ijms231911933.
Revisiting the sigma-1 receptor as a biological target to treat affective and cognitive disorders.
Salaciak K, Pytka K Neurosci Biobehav Rev. 2021; 132:1114-1136.
PMID: 34736882 PMC: 8559442. DOI: 10.1016/j.neubiorev.2021.10.037.
Sigma-1 Receptor: A Potential Therapeutic Target for Traumatic Brain Injury.
Shi M, Chen F, Chen Z, Yang W, Yue S, Zhang J Front Cell Neurosci. 2021; 15:685201.
PMID: 34658788 PMC: 8515188. DOI: 10.3389/fncel.2021.685201.