6V4K

Structure of TrkH-TrkA in complex with ADP

6V4K の概要

• エントリーDOI: 10.2210/pdb6v4k/pdb
• 分子名称: Trk system potassium uptake protein, Potassium transporter peripheral membrane component, ADENOSINE-5'-DIPHOSPHATE (3 entities in total)
• 機能のキーワード: ion channel, trkh, trka, nucleotide binding, transport protein
• 由来する生物種: Vibrio parahaemolyticus; 詳細
• タンパク質・核酸の鎖数: 8
• 化学式量合計: 414898.65

構造登録者

Zhou, M.,Zhang, H. (登録日: 2019-11-27, 公開日: 2020-02-12, 最終更新日: 2023-10-11)

主引用文献

Zhang, H.,Pan, Y.,Hu, L.,Hudson, M.A.,Hofstetter, K.S.,Xu, Z.,Rong, M.,Wang, Z.,Prasad, B.V.V.,Lockless, S.W.,Chiu, W.,Zhou, M.
TrkA undergoes a tetramer-to-dimer conversion to open TrkH which enables changes in membrane potential.
Nat Commun, 11:547-547, 2020

PubMed Abstract: TrkH is a bacterial ion channel implicated in K uptake and pH regulation. TrkH assembles with its regulatory protein, TrkA, which closes the channel when bound to ADP and opens it when bound to ATP. However, it is unknown how nucleotides control the gating of TrkH through TrkA. Here we report the structures of the TrkH-TrkA complex in the presence of ADP or ATP. TrkA forms a tetrameric ring when bound to ADP and constrains TrkH to a closed conformation. The TrkA ring splits into two TrkA dimers in the presence of ATP and releases the constraints on TrkH, resulting in an open channel conformation. Functional studies show that both the tetramer-to-dimer conversion of TrkA and the loss of constraints on TrkH are required for channel gating. In addition, deletion of TrkA in Escherichia coli depolarizes the cell, suggesting that the TrkH-TrkA complex couples changes in intracellular nucleotides to membrane potential.

PubMed: 31992706
DOI: 10.1038/s41467-019-14240-9

実験手法

X-RAY DIFFRACTION (3.53004144504 Å)