Atomic structure of mutant PPARγ LBD complexed with 15d-PGJ2: Novel modulation mechanism of PPARγ/RXRα function by covalently bound ligands

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Abstract

15-deoxy-Δ12,14-prostaglandin J2 (15d-PGJ2) activates a nuclear receptor heterodimer, peroxisome proliferators-activated receptor γ (PPARγ)/ retinoid X receptor (RXRα) through covalent binding to Cys285 in PPARγ ligand-binding domain (LBD). Here, we present the 1.9 Å crystal structure of C285S mutant LBD complexed with 15d-PGJ2, corresponding to the non-covalently bound state. The ligand lies adjacent to a hydrogen-bond network around the helix H2 and the nearby β-sheet. Comparisons with previous structures clarified the relationships between PPARγ function and conformational alterations of LBD during the process of covalently binding ligands, such as 15d-PGJ2, and thus suggested a mechanism, by which these ligands modulate PPARγ/RXRα function through conformational changes of the loop following helix H2′ and the β-sheet. © 2008 Federation of European Biochemical Societies.

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Waku, T., Shiraki, T., Oyama, T., & Morikawa, K. (2009). Atomic structure of mutant PPARγ LBD complexed with 15d-PGJ2: Novel modulation mechanism of PPARγ/RXRα function by covalently bound ligands. FEBS Letters, 583(2), 320–324. https://doi.org/10.1016/j.febslet.2008.12.017

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