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- PDB-4r6z: Crystal Structure of CNG mimicking NaK mutant, NaK-ETPP, Cs+ complex -

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Basic information

Entry
Database: PDB / ID: 4r6z
TitleCrystal Structure of CNG mimicking NaK mutant, NaK-ETPP, Cs+ complex
ComponentsPotassium channel protein
KeywordsTRANSPORT PROTEIN / ALPHA-HELICAL membrane protein / Chimera channel
Function / homology
Function and homology information


stabilization of membrane potential / potassium ion leak channel activity / outward rectifier potassium channel activity / membrane / identical protein binding / metal ion binding
Similarity search - Function
Two pore domain potassium channel / Helix Hairpins - #70 / Potassium channel domain / Ion channel / Helix Hairpins / Orthogonal Bundle / Mainly Alpha
Similarity search - Domain/homology
: / GLYCINE / Potassium channel protein
Similarity search - Component
Biological speciesBacillus cereus ATCC 14579 (bacteria)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2.3 Å
AuthorsDe March, M. / Napolitano, L.M.R. / Onesti, S.
CitationJournal: Proc.Natl.Acad.Sci.USA / Year: 2015
Title: A structural, functional, and computational analysis suggests pore flexibility as the base for the poor selectivity of CNG channels.
Authors: Napolitano, L.M. / Bisha, I. / De March, M. / Marchesi, A. / Arcangeletti, M. / Demitri, N. / Mazzolini, M. / Rodriguez, A. / Magistrato, A. / Onesti, S. / Laio, A. / Torre, V.
History
DepositionAug 26, 2014Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 1, 2015Provider: repository / Type: Initial release
Revision 1.1Jul 22, 2015Group: Database references
Revision 1.2Jan 31, 2018Group: Experimental preparation / Category: exptl_crystal_grow
Item: _exptl_crystal_grow.pdbx_details / _exptl_crystal_grow.temp
Revision 1.3Sep 20, 2023Group: Data collection / Database references ...Data collection / Database references / Derived calculations / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / pdbx_initial_refinement_model / pdbx_struct_conn_angle / struct_conn / struct_ref_seq_dif / struct_site
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _pdbx_struct_conn_angle.ptnr1_auth_asym_id / _pdbx_struct_conn_angle.ptnr1_auth_comp_id / _pdbx_struct_conn_angle.ptnr1_auth_seq_id / _pdbx_struct_conn_angle.ptnr1_label_asym_id / _pdbx_struct_conn_angle.ptnr1_label_atom_id / _pdbx_struct_conn_angle.ptnr1_label_comp_id / _pdbx_struct_conn_angle.ptnr1_label_seq_id / _pdbx_struct_conn_angle.ptnr2_auth_asym_id / _pdbx_struct_conn_angle.ptnr2_auth_seq_id / _pdbx_struct_conn_angle.ptnr2_label_asym_id / _pdbx_struct_conn_angle.ptnr3_auth_asym_id / _pdbx_struct_conn_angle.ptnr3_auth_comp_id / _pdbx_struct_conn_angle.ptnr3_auth_seq_id / _pdbx_struct_conn_angle.ptnr3_label_asym_id / _pdbx_struct_conn_angle.ptnr3_label_comp_id / _pdbx_struct_conn_angle.ptnr3_label_seq_id / _pdbx_struct_conn_angle.value / _struct_conn.pdbx_dist_value / _struct_conn.ptnr1_auth_asym_id / _struct_conn.ptnr1_auth_comp_id / _struct_conn.ptnr1_auth_seq_id / _struct_conn.ptnr1_label_asym_id / _struct_conn.ptnr1_label_atom_id / _struct_conn.ptnr1_label_comp_id / _struct_conn.ptnr1_label_seq_id / _struct_conn.ptnr2_auth_asym_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id / _struct_ref_seq_dif.details / _struct_site.pdbx_auth_asym_id / _struct_site.pdbx_auth_comp_id / _struct_site.pdbx_auth_seq_id

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Potassium channel protein
B: Potassium channel protein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)23,05521
Polymers21,2532
Non-polymers1,80219
Water1,15364
1
A: Potassium channel protein
hetero molecules

A: Potassium channel protein
hetero molecules

A: Potassium channel protein
hetero molecules

A: Potassium channel protein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)46,01640
Polymers42,5064
Non-polymers3,51036
Water724
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
crystal symmetry operation2_775-x+2,-y+2,z1
crystal symmetry operation3_755-y+2,x,z1
crystal symmetry operation4_575y,-x+2,z1
Buried area9930 Å2
ΔGint-298 kcal/mol
Surface area16140 Å2
MethodPISA
2
B: Potassium channel protein
hetero molecules

B: Potassium channel protein
hetero molecules

B: Potassium channel protein
hetero molecules

B: Potassium channel protein
hetero molecules


Theoretical massNumber of molelcules
Total (without water)46,20344
Polymers42,5064
Non-polymers3,69740
Water724
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
crystal symmetry operation2_775-x+2,-y+2,z1
crystal symmetry operation3_755-y+2,x,z1
crystal symmetry operation4_575y,-x+2,z1
Buried area8790 Å2
ΔGint-299 kcal/mol
Surface area17880 Å2
MethodPISA
Unit cell
Length a, b, c (Å)68.170, 68.170, 90.400
Angle α, β, γ (deg.)90.00, 90.00, 90.00
Int Tables number79
Space group name H-MI4
Components on special symmetry positions
IDModelComponents
11A-201-

CS

21A-202-

CS

31B-201-

CS

41B-202-

CS

51B-203-

CS

61A-303-

HOH

71A-313-

HOH

81A-314-

HOH

91A-319-

HOH

101A-320-

HOH

111B-314-

HOH

DetailsTetrameric channel with pore on 4-fold axis

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Components

#1: Protein Potassium channel protein /


Mass: 10626.555 Da / Num. of mol.: 2 / Fragment: residues 20-110 / Mutation: D66E, G67T, N68P, F69P
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bacillus cereus ATCC 14579 (bacteria) / Strain: ATCC 14579 / DSM 31 / Gene: BC_0669 / Plasmid: pQE60 / Production host: Escherichia coli (E. coli) / Strain (production host): XL1-Blue / References: UniProt: Q81HW2
#2: Chemical
ChemComp-CS / CESIUM ION


Mass: 132.905 Da / Num. of mol.: 5 / Source method: obtained synthetically / Formula: Cs
#3: Chemical ChemComp-MPD / (4S)-2-METHYL-2,4-PENTANEDIOL / 2-Methyl-2,4-pentanediol


Mass: 118.174 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C6H14O2 / Comment: precipitant*YM
#4: Chemical
ChemComp-GLY / GLYCINE / Glycine


Type: peptide linking / Mass: 75.067 Da / Num. of mol.: 12 / Source method: obtained synthetically / Formula: C2H5NO2
#5: Water ChemComp-HOH / water / Water


Mass: 18.015 Da / Num. of mol.: 64 / Source method: isolated from a natural source / Formula: H2O

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Experimental details

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Experiment

ExperimentMethod: X-RAY DIFFRACTION / Number of used crystals: 2

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Sample preparation

CrystalDensity Matthews: 2.47 Å3/Da / Density % sol: 50.22 %
Crystal growMethod: vapor diffusion, hanging drop
Details: CNG-ETPP(K+) crystals grown in 100mM MES pH 6.5, 60-66% (w/v) MPD, 100mM Glycine. Soaking overnight in 70% MPD, 10mM DM, 100mM Hepes pH 7.5 and 100mM CsCl, VAPOR DIFFUSION, HANGING DROP
PH range: 6.5 - 7.5

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Data collection

DiffractionMean temperature: 100 K
Diffraction sourceSource: SYNCHROTRON / Site: ESRF / Beamline: ID29 / Wavelength: 1.2398 Å
DetectorType: PSI PILATUS 6M / Detector: PIXEL / Date: Jul 26, 2013
RadiationMonochromator: Si 111 / Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthWavelength: 1.2398 Å / Relative weight: 1
ReflectionResolution: 2.3→54.43 Å / Num. obs: 1330 / % possible obs: 98.9 % / Observed criterion σ(F): 1.7 / Observed criterion σ(I): 1.7
Reflection shell
Resolution (Å)Rmerge(I) obsMean I/σ(I) obsDiffraction-ID% possible all
2.3-54.430.1143.1198.9
2.3-2.420.431.7198.9

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Processing

Software
NameVersionClassification
DNAdata collection
MOLREPphasing
REFMAC5.7.0refinement
MOSFLMdata reduction
SCALAdata scaling
RefinementMethod to determine structure: MOLECULAR REPLACEMENT
Starting model: 3K0D

3k0d


Resolution: 2.3→54.43 Å / σ(F): 1.7 / Stereochemistry target values: Engh & Huber / Details: REFINEMENT WITH TWIN OPTION in REFMAC5
RfactorNum. reflectionSelection details
Rfree0.182 432 RANDOM
Rwork0.152 --
all0.165 --
obs0.153 8657 -
Refinement stepCycle: LAST / Resolution: 2.3→54.43 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms1356 0 81 64 1501
Refine LS restraints
Refine-IDTypeDev ideal
X-RAY DIFFRACTIONr_angle_refined_deg1.9813
X-RAY DIFFRACTIONr_bond_refined_d0.0184

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