7ZK3 | pdb_00007zk3

Structure of 1PBC- and calcium-bound mTMEM16A(ac) chloride channel at 2.85 A resolution

PDB DOI: https://doi.org/10.2210/pdb7ZK3/pdb
EM Map EMD-14753: EMDB EMDataResource

Classification: MEMBRANE PROTEIN
Organism(s): Mus musculus
Expression System: Homo sapiens
Mutation(s): No
Membrane Protein: Yes OPM PDBTM mpstruc

Deposited: 2022-04-12 Released: 2022-05-25
Deposition Author(s): Lam, A.K.M., Rutz, S., Dutzler, R.
Funding Organization(s): European Research Council (ERC), University of Zurich

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 2.85 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

wwPDB Validation 3D Report Full Report

This is version 1.2 of the entry. See complete history.

Literature

Inhibition mechanism of the chloride channel TMEM16A by the pore blocker 1PBC.

Lam, A.K.M., Rutz, S., Dutzler, R.

(2022) Nat Commun 13: 2798-2798

PubMed: 35589730 Search on PubMed Search on PubMed Central
DOI: https://doi.org/10.1038/s41467-022-30479-1
Primary Citation Related Structures:
7ZK3

PubMed Abstract:
TMEM16A, a calcium-activated chloride channel involved in multiple cellular processes, is a proposed target for diseases such as hypertension, asthma, and cystic fibrosis. Despite these therapeutic promises, its pharmacology remains poorly understood. Here, we present a cryo-EM structure of TMEM16A in complex with the channel blocker 1PBC and a detailed functional analysis of its inhibition mechanism. A pocket located external to the neck region of the hourglass-shaped pore is responsible for open-channel block by 1PBC and presumably also by its structural analogs. The binding of the blocker stabilizes an open-like conformation of the channel that involves a rearrangement of several pore helices. The expansion of the outer pore enhances blocker sensitivity and enables 1PBC to bind at a site within the transmembrane electric field. Our results define the mechanism of inhibition and gating and will facilitate the design of new, potent TMEM16A modulators.

Organizational Affiliation

Department of Biochemistry, University of Zurich, Winterthurer Str. 190, CH-8057, Zurich, Switzerland. a.lam@bioc.uzh.ch.

Macromolecule Content

Total Structure Weight: 222.91 kDa
Atom Count: 11,898
Modeled Residue Count: 1,442
Deposited Residue Count: 1,920
Unique protein chains: 1

Macromolecules

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Anoctamin-1	A, B	960	Mus musculus	Mutation(s): 0 Gene Names: Ano1, Tmem16a Membrane Entity: Yes
UniProt
Find proteins for Q8BHY3 (Mus musculus) Explore Q8BHY3 Go to UniProtKB: Q8BHY3
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	Q8BHY3
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
JRF (Subject of Investigation/LOI) Query on JRF Download:Ideal Coordinates CCD File SDF format, chain E [auth A] SDF format, chain I [auth B] MOL2 format, chain E [auth A] MOL2 format, chain I [auth B] mmCIF format, chain E [auth A] mmCIF format, chain I [auth B]	E [auth A], I [auth B]	1-Hydroxy-3-(trifluoromethyl)pyrido[1,2-a]benzimidazole-4-carbonitrile C₁₃ H₆ F₃ N₃ O NSMPADIWUYJQKF-UHFFFAOYSA-N		Interactions Focus chain E [auth A] Focus chain I [auth B] Interactions & Density Focus chain E [auth A] Focus chain I [auth B]
CA (Subject of Investigation/LOI) Query on CA Download:Ideal Coordinates CCD File SDF format, chain F [auth A] SDF format, chain H [auth B] SDF format, chain J [auth B] SDF format, chain G [auth B] SDF format, chain D [auth A] SDF format, chain C [auth A] MOL2 format, chain F [auth A] MOL2 format, chain H [auth B] MOL2 format, chain J [auth B] MOL2 format, chain G [auth B] MOL2 format, chain D [auth A] MOL2 format, chain C [auth A] mmCIF format, chain F [auth A] mmCIF format, chain H [auth B] mmCIF format, chain J [auth B] mmCIF format, chain G [auth B] mmCIF format, chain D [auth A] mmCIF format, chain C [auth A]	C [auth A] D [auth A] F [auth A] G [auth B] H [auth B] C [auth A], D [auth A], F [auth A], G [auth B], H [auth B], J [auth B]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N		Interactions Focus chain C [auth A] Focus chain D [auth A] Focus chain F [auth A] Focus chain G [auth B] Focus chain H [auth B] Focus chain J [auth B] Interactions & Density Focus chain C [auth A] Focus chain D [auth A] Focus chain F [auth A] Focus chain G [auth B] Focus chain H [auth B] Focus chain J [auth B]