Structural basis of ligand recognition and gating in a heteromeric Deg-3/Des-2 nicotinic acetylcholine receptor

During evolution, nicotinic acetylcholine receptors (nAChRs) have diversified in subunit composition and ligand selectivity, enabling a conserved ion channel scaffold to support a broad range of signaling functions beyond classical synaptic transmission....

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No actionable change — this is early-stage structural biology research on a non-mammalian receptor with no direct clinical or audiological practice implications at this time.

Understanding the structural and evolutionary basis of nicotinic acetylcholine receptor gating could, in the long run, inform drug design targeting auditory hair-cell or efferent-pathway receptors, though that application is currently speculative.

1. 01PNAS 2026 study resolves the 3-D structure of a heteromeric Deg-3/Des-2 nicotinic acetylcholine receptor (nAChR).
2. 02Findings reveal molecular details of how the receptor recognizes ligands (chemical messengers) and controls its gating (opening/closing).
3. 03Subunit composition — the specific protein building blocks — shapes ligand selectivity in this receptor family.
4. 04Results shed light on how nAChRs may have evolved different chemical sensitivities across species.
5. 05No direct audiological or hearing-loss application is demonstrated in this study.

PMID

42623446

DOI

10.1073/pnas.2608998123.

Journal

Proceedings of the National Academy of Sciences

Publication type

research_article

Evidence level

4

Population

Non-mammalian (invertebrate) heteromeric nicotinic acetylcholine receptor expressed in structural biology model system

Intervention

Structural characterization of heteromeric Deg-3/Des-2 nicotinic acetylcholine receptor via cryo-EM or X-ray crystallography