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TitleGating choreography and mechanism of the human proton-activated chloride channel ASOR.
Journal, issue, pagesSci Adv, Vol. 8, Issue 5, Page eabm3942, Year 2022
Publish dateFeb 4, 2022
AuthorsChongyuan Wang / Maya M Polovitskaya / Bryce D Delgado / Thomas J Jentsch / Stephen B Long /
PubMed AbstractThe proton-activated chloride channel ASOR (TMEM206/PAC) permeates anions across cellular membranes in response to acidification, thereby enhancing acid-induced cell death and regulating endocytosis. ...The proton-activated chloride channel ASOR (TMEM206/PAC) permeates anions across cellular membranes in response to acidification, thereby enhancing acid-induced cell death and regulating endocytosis. The molecular mechanisms of pH-dependent control are not understood, in part because structural information for an activated conformation of ASOR is lacking. Here, we reconstitute function from purified protein and present a 3.1-Å-resolution cryo-electron microscopy structure of human ASOR at acidic pH in an activated conformation. The work contextualizes a previous acidic pH structure as a desensitized conformation. Combined with electrophysiological studies and high-resolution structures of resting and desensitized states, the work reveals mechanisms of proton sensing and ion pore gating. Clusters of extracellular acidic residues function as pH sensors and coalesce when protonated. Ensuing conformational changes induce metamorphosis of transmembrane helices to fashion an ion conduction pathway unique to the activated conformation. The studies identify a new paradigm of channel gating in this ubiquitous ion channel.
External linksSci Adv / PubMed:35108041 / PubMed Central
MethodsEM (single particle)
Resolution2.5 - 3.1 Å
Structure data

25383

7sqf

EMDB-25383, PDB-7sqf:
Structure of the human proton-activated chloride channel ASOR in activated conformation
Method: EM (single particle) / Resolution: 3.1 Å

25384

7sqg

EMDB-25384, PDB-7sqg:
Structure of the human proton-activated chloride channel ASOR in resting conformation
Method: EM (single particle) / Resolution: 2.6 Å

25385

7sqh

EMDB-25385, PDB-7sqh:
Structure of the human proton-activated chloride channel ASOR in desensitized conformation
Method: EM (single particle) / Resolution: 2.5 Å

Chemicals

ChemComp-NAG:
2-acetamido-2-deoxy-beta-D-glucopyranose / N-Acetylglucosamine

ChemComp-HOH:
WATER / Water

Source
  • homo sapiens (human)
KeywordsMEMBRANE PROTEIN / ion channel / chloride channel

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