Distinction of the binding modes for human nuclear receptor ERRγ between bisphenol A and 4-hydroxytamoxifen

Xiaohui Liu, Ayami Matsushima, Hiroyuki Okada, Yasuyuki Shimohigashi

研究成果: Contribution to journalArticle査読

17 被引用数 (Scopus)

抄録

Bisphenol A (BPA) strongly binds to human estrogen-related receptor γ (ERRγ). BPA is an oestrogenic endocrine disruptor that influences various physiological functions at very low doses. BPA functions as an inverse-type antagonist of ERRγ to retain its high basal constitutive activity by inhibiting the deactivating inverse agonist activity of 4-hydroxytamoxifen (4-OHT). We recently demonstrated that ERRγ receptor residues Glu275 and Arg316 function as the intrinsic binding site of BPA's phenol-hydroxyl group. We also determined the chief importance of phenol-hydroxyl↔Arg316 hydrogen bonding and the corroborative role of phenol-hydroxyl↔Glu275 hydrogen bonding. However, there appeared to be a distinct difference between the receptor binding modes of BPA and 4-OHT. In the present study, using tritium-labelled or non-labelled BPA and 4-OHT, we evaluated in detail the receptor binding capabilities of wild-type ERRγ and its mutants with amino acid alterations at positions 275 and 316. Both compounds exhibited a strong binding ability to wild-type ERRγ due to the hydrogen bonding to Glu275 and Arg316. However, 4-OHT revealed significantly reduced occupancy for both wild-type and mutant receptors. The data obtained suggest that 4-OHT barely binds to ERRγ due to the strong ability of Glu275 and Arg316 to recruit phenol compounds.

本文言語英語
ページ(範囲)247-254
ページ数8
ジャーナルJournal of biochemistry
148
2
DOI
出版ステータス出版済み - 8 2010

All Science Journal Classification (ASJC) codes

  • 生化学
  • 分子生物学

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