Determinants of α-conotoxin BuIA selectivity on the nicotinic acetylcholine receptor β subunit

David L. Shiembob, Ryan L. Roberts, Charles W Luetje, J. Michael McIntosh

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Neuronal nicotinic acetylcholine receptors (nAChRs) are pentamers composed of α and β subunits. Different molecular compositions of these subunits constitute various receptor subtypes that are implicated in the pathophysiology and/or treatment of several disease states but are difficult to distinguish pharmacologically. α-Conotoxins are a group of small, structurally defined peptides that may be used to molecularly dissect the nAChR-binding site. Heteromeric nAChRs generally contain either a β2 or β4 subunit in addition to an α subunit at the ligand-binding interface. α-Conotoxin BuIA kinetically distinguishes between β2- and β4-containing nAChRs, with long off times for the latter. Mutational studies were used to assess the influence of residues that line the putative acetylcholine-binding pocket but differ between β2 and β4 subunits. Residues Thr/Lys59, Val/Ile111, and Phe/Gln119 of the respective β2 and β4 subunits are critical to off-rate differences. Among these residues, Thr59 of nAChR β2 may interfere with effective access to the binding site, whereas Lys59 may facilitate this binding.

Original languageEnglish
Pages (from-to)11200-11207
Number of pages8
JournalBiochemistry
Volume45
Issue number37
DOIs
StatePublished - Sep 19 2006

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Conotoxins
Nicotinic Receptors
Binding Sites
Acetylcholine
Ligands
Peptides
Chemical analysis

ASJC Scopus subject areas

  • Biochemistry

Cite this

Shiembob, D. L., Roberts, R. L., Luetje, C. W., & McIntosh, J. M. (2006). Determinants of α-conotoxin BuIA selectivity on the nicotinic acetylcholine receptor β subunit. Biochemistry, 45(37), 11200-11207. https://doi.org/10.1021/bi0611715

Determinants of α-conotoxin BuIA selectivity on the nicotinic acetylcholine receptor β subunit. / Shiembob, David L.; Roberts, Ryan L.; Luetje, Charles W; McIntosh, J. Michael.

In: Biochemistry, Vol. 45, No. 37, 19.09.2006, p. 11200-11207.

Research output: Contribution to journalArticle

Shiembob, DL, Roberts, RL, Luetje, CW & McIntosh, JM 2006, 'Determinants of α-conotoxin BuIA selectivity on the nicotinic acetylcholine receptor β subunit', Biochemistry, vol. 45, no. 37, pp. 11200-11207. https://doi.org/10.1021/bi0611715
Shiembob, David L. ; Roberts, Ryan L. ; Luetje, Charles W ; McIntosh, J. Michael. / Determinants of α-conotoxin BuIA selectivity on the nicotinic acetylcholine receptor β subunit. In: Biochemistry. 2006 ; Vol. 45, No. 37. pp. 11200-11207.
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