The power stroke driven by ATP binding in CFTR as studied by molecular dynamics simulations

Tomoka Furukawa-Hagiya, Tadaomi Furuta, Shuntaro Chiba, Yoshiro Sohma, Minoru Sakurai

研究成果: Article査読

28 被引用数 (Scopus)

抄録

Cystic fibrosis transmembrane conductance regulator (CFTR) is a chloride channel belonging to the ATP binding cassette (ABC) protein superfamily. Currently, it remains unclear how ATP binding causes the opening of the channel gate at the molecular level. To clarify this mechanism, we first constructed an atomic model of the inward-facing CFTR using the X-ray structures of other ABC proteins. Molecular dynamics (MD) simulations were then performed to explore the structure and dynamics of the inward-facing CFTR in a membrane environment. In the MgATP-bound state, two nucleotide-binding domains (NBDs) formed a head-to-tail type of dimer, in which the ATP molecules were sandwiched between the Walker A and signature motifs. Alternatively, one of the final MD structures in the apo state was similar to that of a "closed-apo" conformation found in the X-ray analysis of ATP-free MsbA. Principal component analysis for the MD trajectory indicated that NBD dimerization causes significant structural and dynamical changes in the transmembrane domains (TMDs), which is likely indicative of the formation of a chloride ion access path. This study suggests that the free energy gain from ATP binding acts as a driving force not only for NBD dimerization but also for NBD-TMD concerted motions.

本文言語English
ページ(範囲)83-93
ページ数11
ジャーナルJournal of Physical Chemistry B
117
1
DOI
出版ステータスPublished - 2013 1月 10

ASJC Scopus subject areas

  • 物理化学および理論化学
  • 表面、皮膜および薄膜
  • 材料化学

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