Back to Search
Start Over
Revealing molecular determinants governing mambalgin-3 pharmacology at acid-sensing ion channel 1 variants.
- Source :
-
Cellular and molecular life sciences : CMLS [Cell Mol Life Sci] 2024 Jun 17; Vol. 81 (1), pp. 266. Date of Electronic Publication: 2024 Jun 17. - Publication Year :
- 2024
-
Abstract
- Acid-sensing ion channels (ASICs) are trimeric proton-gated cation channels that play a role in neurotransmission and pain sensation. The snake venom-derived peptides, mambalgins, exhibit potent analgesic effects in rodents by inhibiting central ASIC1a and peripheral ASIC1b. Despite their distinct species- and subtype-dependent pharmacology, previous structure-function studies have focussed on the mambalgin interaction with ASIC1a. Currently, the specific channel residues responsible for this pharmacological profile, and the mambalgin pharmacophore at ASIC1b remain unknown. Here we identify non-conserved residues at the ASIC1 subunit interface that drive differences in the mambalgin pharmacology from rat ASIC1a to ASIC1b, some of which likely do not make peptide binding interactions. Additionally, an amino acid variation below the core binding site explains potency differences between rat and human ASIC1. Two regions within the palm domain, which contribute to subtype-dependent effects for mambalgins, play key roles in ASIC gating, consistent with subtype-specific differences in the peptides mechanism. Lastly, there is a shared primary mambalgin pharmacophore for ASIC1a and ASIC1b activity, with certain peripheral peptide residues showing variant-specific significance for potency. Through our broad mutagenesis studies across various species and subtype variants, we gain a more comprehensive understanding of the pharmacophore and the intricate molecular interactions that underlie ligand specificity. These insights pave the way for the development of more potent and targeted peptide analogues required to advance our understating of human ASIC1 function and its role in disease.<br /> (© 2024. The Author(s).)
- Subjects :
- Animals
Humans
Rats
Amino Acid Sequence
Binding Sites
Models, Molecular
Xenopus laevis
Peptides
Acid Sensing Ion Channels metabolism
Acid Sensing Ion Channels genetics
Acid Sensing Ion Channels chemistry
Elapid Venoms chemistry
Elapid Venoms metabolism
Elapid Venoms pharmacology
Elapid Venoms genetics
Subjects
Details
- Language :
- English
- ISSN :
- 1420-9071
- Volume :
- 81
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Cellular and molecular life sciences : CMLS
- Publication Type :
- Academic Journal
- Accession number :
- 38880807
- Full Text :
- https://doi.org/10.1007/s00018-024-05276-2