Chloride channel ClC-3 / Chloride channel, voltage gated / Chloride channel, core / Voltage gated chloride channel / Domain in cystathionine beta-synthase and other proteins. / CBS domain superfamily / CBS domain / CBS domain / CBS domain profile. 類似検索 - ドメイン・相同性
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
141553
米国
National Institutes of Health/National Cancer Institute (NIH/NCI)
008748
米国
引用
ジャーナル: bioRxiv / 年: 2025 タイトル: Structural basis of ClC-3 inhibition by TMEM9 and PI(3,5)P. 著者: Marina Schrecker / Yeeun Son / Rosa Planells-Cases / Sumanta Kar / Viktoriia Vorobeva / Uwe Schulte / Bernd Fakler / Thomas J Jentsch / Richard K Hite / 要旨: The trafficking and activity of endosomes relies on the exchange of chloride ions and protons by members of the CLC family of chloride channels and transporters, whose mutations are associated with ...The trafficking and activity of endosomes relies on the exchange of chloride ions and protons by members of the CLC family of chloride channels and transporters, whose mutations are associated with numerous diseases. Despite their critical roles, the mechanisms by which CLC transporters are regulated are poorly understood. Here, we show that two related accessory β-subunits, TMEM9 and TMEM9B, directly interact with ClC-3, -4 and -5. Cryo-EM structures reveal that TMEM9 inhibits ClC-3 by sealing the cytosolic entrance to the Cl ion pathway. Unexpectedly, we find that PI(3,5)P stabilizes the interaction between TMEM9 and ClC-3 and is required for proper regulation of ClC-3 by TMEM9. Collectively, our findings reveal that TMEM9 and PI(3,5)P collaborate to regulate endosomal ion homeostasis by modulating the activity of ClC-3.