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Fan, MingQi and Bell, Alex R. and Bell, David Robert and Clode, Sally and Fernandes, Alwyn and Foster, Paul M.D. and Fry, Jeffery R. and Jiang, tao and Loizou, George and MacNicoll, Alan and Rose, Martin and Miller, Brian G. and Shaikh-Omar, Osama and Tran, Lang and White, Shaun (2009) Recombinant expression of Aryl Hydrocarbon Receptor for quantitative ligand-binding analysis. Analytical Biochemistry, 384 . pp. 279-287. ISSN 0003-2697

Abstract

Recombinant expression of the Aryl Hydrocarbon Receptor (AhR) yields small amounts of ligand-

binding competent AhR. Therefore, Spodoptera frugiperda (Sf9) cells and baculovirus

have been evaluated for high level and functional expression of AhR. Rat and human AhR were

expressed as soluble protein in significant amounts. Expression of ligand-binding competent

AhR was sensitive to the protein concentration of Sf9 extract, and co-expression of the chaperone

p23 failed to affect the yield of functional ligand-binding AhR. The expression system

yielded high levels of functional protein, with the ligand-binding capacity (Bmax) typically 20-

fold higher than that obtained with rat liver cytosol. Quantitative estimates of the ligand-binding

affinity of human and rat AhR were obtained; the Kd for recombinant rat AhR was indistinguishable

from that of native rat AhR, thereby validating the expression system as a faithful

model for native AhR. The human AhR bound TCDD with significantly lower affinity than the

rat AhR. These findings demonstrate high-level expression of ligand-binding competent AhR,

and sufficient AhR for quantitative analysis of ligand-binding.

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