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- PDB-8z3s: Activation mechanism and novel binding site of the BKCa channel a... -

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Basic information

Entry
Database: PDB / ID: 8z3s
TitleActivation mechanism and novel binding site of the BKCa channel activator CTIBD
ComponentsCalcium-activated potassium channel subunit alpha-1
KeywordsMEMBRANE PROTEIN / BKca channel / Slo1 / CTIBD
Function / homology
Function and homology information


Acetylcholine inhibits contraction of outer hair cells / micturition / Ca2+ activated K+ channels / large conductance calcium-activated potassium channel activity / response to carbon monoxide / calcium-activated potassium channel activity / negative regulation of cell volume / smooth muscle contraction involved in micturition / intracellular potassium ion homeostasis / Sensory processing of sound by inner hair cells of the cochlea ...Acetylcholine inhibits contraction of outer hair cells / micturition / Ca2+ activated K+ channels / large conductance calcium-activated potassium channel activity / response to carbon monoxide / calcium-activated potassium channel activity / negative regulation of cell volume / smooth muscle contraction involved in micturition / intracellular potassium ion homeostasis / Sensory processing of sound by inner hair cells of the cochlea / response to osmotic stress / cGMP effects / voltage-gated potassium channel activity / voltage-gated potassium channel complex / potassium ion transmembrane transport / regulation of membrane potential / potassium ion transport / caveola / response to calcium ion / vasodilation / actin binding / postsynaptic membrane / response to hypoxia / positive regulation of apoptotic process / apical plasma membrane / identical protein binding / membrane / metal ion binding / plasma membrane
Similarity search - Function
Calcium-activated potassium channel slowpoke-like RCK domain / : / Ca2+-activated K+ channel Slowpoke, TrkA_C like domain / : / Calcium-activated potassium channel BK, alpha subunit / Calcium-activated BK potassium channel alpha subunit / RCK N-terminal domain profile. / Ion transport domain / Ion transport protein / NAD(P)-binding domain superfamily
Similarity search - Domain/homology
: / CHOLESTEROL HEMISUCCINATE / Calcium-activated potassium channel subunit alpha-1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.9 Å
AuthorsLee, N. / Kim, S. / Jo, H. / Lee, N.Y. / Jin, M.S. / Park, C.S.
Funding support Korea, Republic Of, 3items
OrganizationGrant numberCountry
National Research Foundation (NRF, Korea)NRF-2019M3E5D6063908 Korea, Republic Of
National Research Foundation (NRF, Korea)NRF-2022R1A2C1005532 Korea, Republic Of
National Research Foundation (NRF, Korea)NRF-2021R1A6A3A01086747 Korea, Republic Of
CitationJournal: Life Sci Alliance / Year: 2024
Title: Activation mechanism and novel binding sites of the BK channel activator CTIBD.
Authors: Narasaem Lee / Subin Kim / Na Young Lee / Heeji Jo / Pyeonghwa Jeong / Haushabhau S Pagire / Suvarna H Pagire / Jin Hee Ahn / Mi Sun Jin / Chul-Seung Park /
Abstract: The large-conductance calcium-activated potassium (BK) channel, which is crucial for urinary bladder smooth muscle relaxation, is a potential target for overactive bladder treatment. Our prior work ...The large-conductance calcium-activated potassium (BK) channel, which is crucial for urinary bladder smooth muscle relaxation, is a potential target for overactive bladder treatment. Our prior work unveiled CTIBD as a promising BK channel activator, altering and This study investigates CTIBD's activation mechanism, revealing its independence from the Ca and membrane voltage sensing of the BK channel. Cryo-electron microscopy disclosed that two CTIBD molecules bind to hydrophobic regions on the extracellular side of the lipid bilayer. Key residues (W22, W203, and F266) are important for CTIBD binding, and their replacement with alanine reduces CTIBD-mediated channel activation. The triple-mutant (W22A/W203A/F266A) channel showed the smallest shift with a minimal impact on activation and deactivation kinetics by CTIBD. At the single-channel level, CTIBD treatment was much less effective at increasing in the triple mutant, mainly because of a drastically increased dissociation rate compared with the WT. These findings highlight CTIBD's mechanism, offering crucial insights for developing small-molecule treatments for BK-related pathophysiological conditions.
History
DepositionApr 16, 2024Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jul 31, 2024Provider: repository / Type: Initial release
Revision 1.1Sep 11, 2024Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.identifier_ORCID / _citation_author.name / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Calcium-activated potassium channel subunit alpha-1
B: Calcium-activated potassium channel subunit alpha-1
C: Calcium-activated potassium channel subunit alpha-1
D: Calcium-activated potassium channel subunit alpha-1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)507,37628
Polymers502,1664
Non-polymers5,21024
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: gel filtration, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein
Calcium-activated potassium channel subunit alpha-1 / BK channel / BKCA alpha / Calcium-activated potassium channel / subfamily M subunit alpha-1 / K(VCA) ...BK channel / BKCA alpha / Calcium-activated potassium channel / subfamily M subunit alpha-1 / K(VCA)alpha / KCa1.1 / Maxi K channel / MaxiK / Slo-alpha / Slo1 / Slowpoke homolog / Slo homolog / hSlo


Mass: 125541.461 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: KCNMA1, KCNMA, SLO / Cell line (production host): HEK293S GnTi / Production host: Homo sapiens (human) / References: UniProt: Q12791
#2: Chemical
ChemComp-A1L04 / 4-[4-(4-chlorophenyl)-3-(trifluoromethyl)-1,2-oxazol-5-yl]benzene-1,3-diol


Mass: 355.696 Da / Num. of mol.: 8 / Source method: obtained synthetically / Formula: C16H9ClF3NO3 / Feature type: SUBJECT OF INVESTIGATION
#3: Chemical
ChemComp-Y01 / CHOLESTEROL HEMISUCCINATE


Mass: 486.726 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C31H50O4
#4: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Mg
#5: Chemical
ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 8 / Source method: obtained synthetically / Formula: Ca
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: Calcium-activated potassium channel subunit alpha-1 (Slo1)
Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.5 MDa / Experimental value: YES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human) / Cell: HEK293S GnTi / Plasmid: pEG Bacman
Buffer solutionpH: 8
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMTris hydrochlorideTris-HCl1
2450 mMPotassium chlorideKCl1
310 mMCalcium chlorideCaCl21
40.01 %Glyco-diosgeninGDN1
50.045 mg/ml1-palmitoyl-2-oleoyl-glycero-3-phosphocholinePOPC1
60.045 mg/ml1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanolaminePOPE1
70.01 mg/ml1-palmitoyl-2-oleoyl-sn-glycero-3-phosphatePOPA1
SpecimenConc.: 5.5 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 278 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 73000 X / Nominal defocus max: 2600 nm / Nominal defocus min: 1400 nm / Cs: 2.7 mm
Specimen holderCryogen: NITROGEN
Image recordingAverage exposure time: 13.67 sec. / Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of real images: 4806

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Processing

EM software
IDNameVersionCategoryDetails
1cryoSPARC3.3.2particle selectionBlob Picker
2cryoSPARC3.3.2particle selectionTemplate Picker
5cryoSPARC3.3.2CTF correctionPatch CTF Estimation
8UCSF Chimeramodel fitting
9PHENIXmodel fitting
13cryoSPARC3.3.2classificationHeterogeneous Refinement
14cryoSPARC3.3.23D reconstructionNon-uniform Refinement
15PHENIXmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 700885
SymmetryPoint symmetry: C4 (4 fold cyclic)
3D reconstructionResolution: 3.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 288878 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT
Atomic model buildingPDB-ID: 6V38

6v38


Accession code: 6V38 / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00529884
ELECTRON MICROSCOPYf_angle_d0.68540639
ELECTRON MICROSCOPYf_dihedral_angle_d15.6694252
ELECTRON MICROSCOPYf_chiral_restr0.0464644
ELECTRON MICROSCOPYf_plane_restr0.0045047

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