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. 1992 Nov 1;287(Pt 3):833–840. doi: 10.1042/bj2870833

Characterization and purification of human retinoic acid receptor-gamma 1 overexpressed in the baculovirus-insect cell system.

A P Reddy 1, J Y Chen 1, T Zacharewski 1, H Gronemeyer 1, J J Voorhees 1, G J Fisher 1
PMCID: PMC1133083  PMID: 1332684

Abstract

The full-length cDNA for the human retinoic acid receptor-gamma 1 (RAR-gamma 1) has been expressed to high levels in Spodoptera frugiferda (Sf9) cells using the baculovirus expression system. Western blot analysis revealed that RAR-gamma 1 expression increased between 32 and 60 h post-infection. The recombinant receptor was expressed primarily as a nuclear protein and displayed a molecular mass of 50 kDa as determined by SDS/PAGE and gel-filtration chromatography, consistent with its cDNA-deduced size. Based on ligand binding, 2 x 10(6) RAR-gamma 1 molecules were expressed per Sf9 cell, a level approx. 2000 times greater than in mammalian cells. The receptor was partially purified 300-fold by sequential anion-exchange, gel-filtration and DNA affinity chromatographies. The overexpressed receptor specifically bound all-trans-retinoic acid (RA) and the synthetic retinoid CD367 with high affinity (Kd 0.15 nM and 0.23 nM respectively). The RA metabolites 4-hydroxy-RA and 4-oxo-RA were poor competitors for [3H]CD367 binding to recombinant RAR-gamma 1 (K(i) > 1 microM), indicating that 4-oxidation of RA greatly reduces its affinity for RAR-gamma 1. Gel-retardation analysis demonstrated that RAR-gamma 1 specifically bound the RA response element of the mouse RAR-beta gene. RAR-gamma 1 species expressed from recombinant baculovirus (in Sf9 cells) and vaccinia virus (in HeLa cells) exhibited similar affinities for RA and CD367 and had comparable DNA-binding properties in gel-retardation experiments. Moreover, a similar requirement for additional DNA-binding stimulatory factor(s) was observed in both cases. These results provide a basis for the use of baculovirus-expressed RAR-gamma 1 in further functional and structural studies.

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