Kinetic stabilization of an oligomeric protein by a single ligand binding event

R. Luke Wiseman, Steven Johnson, Matthew S. Kelker, Ted Foss, Ian A. Wilson, Jeffery W. Kelly

Research output: Contribution to journalArticle

80 Citations (Scopus)

Abstract

Protein native state stabilization imposed by small molecule binding is an attractive strategy to prevent the misfolding and misassembly processes associated with amyloid diseases. Transthyretin (TTR) amyloidogenesis requires rate-limiting tetramer dissociation before misassembly of a partially denatured monomer ensues. Selective stabilization of the native TTR tetramer over the dissociative transition state by small molecule binding to both thyroxine binding sites raises the kinetic barrier of tetramer dissociation, preventing amyloidogenesis. Assessing the amyloidogenicity of a TTR tetramer having only one amyloidogenesis inhibitor (I) bound is challenging because the two small molecule binding constants are generally not distinct enough to allow for the exclusive formation of TTR·I in solution to the exclusion of TTR·I2 and unliganded TTR. Herein, we report a method to tether one fibril formation inhibitor to TTR by disulfide bond formation. Occupancy of only one of the two thyroxine binding sites is sufficient to inhibit tetramer dissociation in 6.0 M urea and amyloidogenesis under acidic conditions by imposing kinetic stabilization on the entire tetramer. The sufficiency of single occupancy for stabilizing the native state of TTR provides the incentive to search for compounds displaying striking negative binding cooperativity (e.g., Kd1 in nanomolar range and Kd2 in the micromolar to millimolar range), enabling lower doses of inhibitor to be employed in the clinic, mitigating potential side effects.

Original languageEnglish (US)
Pages (from-to)5540-5551
Number of pages12
JournalJournal of the American Chemical Society
Volume127
Issue number15
DOIs
StatePublished - Apr 20 2005
Externally publishedYes

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Prealbumin
Stabilization
Ligands
Binding sites
Proteins
Molecules
Kinetics
Thyroxine
Urea
Monomers
Binding Sites
Amyloid
Disulfides
Motivation

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Kinetic stabilization of an oligomeric protein by a single ligand binding event. / Wiseman, R. Luke; Johnson, Steven; Kelker, Matthew S.; Foss, Ted; Wilson, Ian A.; Kelly, Jeffery W.

In: Journal of the American Chemical Society, Vol. 127, No. 15, 20.04.2005, p. 5540-5551.

Research output: Contribution to journalArticle

Wiseman, R. Luke ; Johnson, Steven ; Kelker, Matthew S. ; Foss, Ted ; Wilson, Ian A. ; Kelly, Jeffery W. / Kinetic stabilization of an oligomeric protein by a single ligand binding event. In: Journal of the American Chemical Society. 2005 ; Vol. 127, No. 15. pp. 5540-5551.
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