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- PDB-5bkk: bbTBA-bound closed MthK channel in nanodisc -

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Basic information

Entry
Database: PDB / ID: 5bkk
TitlebbTBA-bound closed MthK channel in nanodisc
ComponentsCalcium-gated potassium channel MthK
KeywordsTRANSPORT PROTEIN / ion channel
Function / homology
Function and homology information


monoatomic cation transmembrane transporter activity / potassium ion transport / identical protein binding / metal ion binding / plasma membrane
Similarity search - Function
Regulator of K+ conductance, N-terminal / TrkA-N domain / RCK N-terminal domain profile. / Regulator of K+ conductance, C-terminal / Regulator of K+ conductance, C-terminal domain superfamily / TrkA-C domain / RCK C-terminal domain profile. / Potassium channel domain / Ion channel / NAD(P)-binding domain superfamily
Similarity search - Domain/homology
: / Chem-PGW / Chem-YQ4 / Calcium-gated potassium channel MthK
Similarity search - Component
Biological speciesMethanothermobacter thermautotrophicus (archaea)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.5 Å
AuthorsFan, C. / Nimigean, C.M.
CitationJournal: Nat Chem Biol / Year: 2024
Title: Calcium-gated potassium channel blockade via membrane-facing fenestrations.
Authors: Chen Fan / Emelie Flood / Nattakan Sukomon / Shubhangi Agarwal / Toby W Allen / Crina M Nimigean /
Abstract: Quaternary ammonium blockers were previously shown to bind in the pore to block both open and closed conformations of large-conductance calcium-activated potassium (BK and MthK) channels. Because ...Quaternary ammonium blockers were previously shown to bind in the pore to block both open and closed conformations of large-conductance calcium-activated potassium (BK and MthK) channels. Because blocker entry was assumed through the intracellular entryway (bundle crossing), closed-pore access suggested that the gate was not at the bundle crossing. Structures of closed MthK, a Methanobacterium thermoautotrophicum homolog of BK channels, revealed a tightly constricted intracellular gate, leading us to investigate the membrane-facing fenestrations as alternative pathways for blocker access directly from the membrane. Atomistic free energy simulations showed that intracellular blockers indeed access the pore through the fenestrations, and a mutant channel with narrower fenestrations displayed no closed-state TPeA block at concentrations that blocked the wild-type channel. Apo BK channels display similar fenestrations, suggesting that blockers may use them as access paths into closed channels. Thus, membrane fenestrations represent a non-canonical pathway for selective targeting of specific channel conformations, opening novel ways to selectively drug BK channels.
History
DepositionMar 19, 2021Deposition site: RCSB / Processing site: RCSB
Revision 1.0Sep 21, 2022Provider: repository / Type: Initial release
Revision 1.1Oct 4, 2023Group: Data collection / Database references / Structure summary
Category: audit_author / chem_comp_atom ...audit_author / chem_comp_atom / chem_comp_bond / citation / citation_author / em_author_list
Item: _audit_author.name / _citation.country ..._audit_author.name / _citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _em_author_list.author

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Calcium-gated potassium channel MthK
B: Calcium-gated potassium channel MthK
C: Calcium-gated potassium channel MthK
D: Calcium-gated potassium channel MthK
E: Calcium-gated potassium channel MthK
F: Calcium-gated potassium channel MthK
G: Calcium-gated potassium channel MthK
H: Calcium-gated potassium channel MthK
hetero molecules


Theoretical massNumber of molelcules
Total (without water)300,84714
Polymers298,8498
Non-polymers1,9986
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Calcium-gated potassium channel MthK


Mass: 37356.160 Da / Num. of mol.: 8
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Methanothermobacter thermautotrophicus (archaea)
Gene: mthK, MTH_1520 / Production host: Escherichia coli (E. coli) / References: UniProt: O27564
#2: Chemical ChemComp-PGW / (1R)-2-{[(S)-{[(2S)-2,3-dihydroxypropyl]oxy}(hydroxy)phosphoryl]oxy}-1-[(hexadecanoyloxy)methyl]ethyl (9Z)-octadec-9-enoate / 1-Palmitoyl-2-Oleoyl-sn-Glycero-3-[Phospho-(1-glycerol)] / PHOSPHATIDYLGLYCEROL / Phosphatidylglycerol


Mass: 749.007 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C40H77O10P / Feature type: SUBJECT OF INVESTIGATION / Comment: phospholipid*YM
#3: Chemical ChemComp-K / POTASSIUM ION


Mass: 39.098 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: K
#4: Chemical ChemComp-YQ4 / (~{R})-phenyl-[4-[(tributyl-$l^{4}-azanyl)methyl]phenyl]methanol


Mass: 382.602 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C26H40NO / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: MthK / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Methanothermobacter thermautotrophicus (archaea)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 8.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 52.52 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.14_3260: / Classification: refinement
CTF correctionType: PHASE FLIPPING ONLY
3D reconstructionResolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 260164 / Symmetry type: POINT

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