An alternative conformation of ER beta bound to estradiol reveals H12 in a stable antagonist position

Autor(es)

Souza, Paulo C. T. ; Textor, Larissa C. ; Melo, Denise C. ; Nascimento, Alessandro S. ; Skaf, Munir S. ; Polikarpov, Igor

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 7, JUN 14 2017.
• Citações Web of Science: 5

Resumo

The natural ligand 17 beta-estradiol (E2) is so far believed to induce a unique agonist-bound active conformation in the ligand binding domain (LBD) of the estrogen receptors (ERs). Both subtypes, ER alpha and ER beta, are transcriptionally activated in the presence of E2 with ER beta being somewhat less active than ERa under similar conditions. The molecular bases for this intriguing behavior are mainly attributed to subtype differences in the amino-terminal domain of these receptors. However, structural details that confer differences in the molecular response of ER LBDs to E2 still remain elusive. In this study, we present a new crystallographic structure of the ER beta LBD bound to E2 in which H12 assumes an alternative conformation that resembles antagonist ERs structures. Structural observations and molecular dynamics simulations jointly provide evidence that alternative ER beta H12 position could correspond to a stable conformation of the receptor under physiological pH conditions. Our findings shed light on the unexpected role of LBD in the lower functional response of ER beta subtype. (AU)

• Processo FAPESP: 13/08293-7 - CECC - Centro de Engenharia e Ciências Computacionais
• Beneficiário: Munir Salomao Skaf
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 14/22007-0 - Simulações de dinâmica molecular coarse-graining de complexos de TLR4
• Beneficiário: Paulo Cesar Telles de Souza
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado
• Processo FAPESP: 12/24750-6 - Relações entre a obesidade e o receptor TLR4: Novos estudos através de simulações de dinâmica molecular
• Beneficiário: Paulo Cesar Telles de Souza
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado