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- PDB-3e8g: Crystal Structure of the the open NaK channel-Na+/Ca2+ complex -

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Basic information

Entry
Database: PDB / ID: 3e8g
TitleCrystal Structure of the the open NaK channel-Na+/Ca2+ complex
ComponentsPotassium channel protein
KeywordsMEMBRANE PROTEIN / non-selective cation channel / tetrameric cation channel family / 2-transmembrane helix channels / Ionic channel
Function / homology
Function and homology information


potassium channel activity / metal ion binding / identical protein binding / membrane
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
: / Potassium channel protein
Similarity search - Component
Biological speciesBacillus cereus (bacteria)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / molecular replacement / Resolution: 2 Å
AuthorsJiang, Y. / Alam, A.
CitationJournal: Nat.Struct.Mol.Biol. / Year: 2009
Title: Structural analysis of ion selectivity in the NaK channel
Authors: Alam, A. / Jiang, Y.
History
DepositionAug 19, 2008Deposition site: RCSB / Processing site: RCSB
Revision 1.0Dec 23, 2008Provider: repository / Type: Initial release
Revision 1.1Jul 13, 2011Group: Version format compliance
Revision 1.2Nov 16, 2011Group: Atomic model
Revision 1.3Oct 25, 2017Group: Refinement description / Category: software
Revision 1.4Feb 21, 2024Group: Data collection / Database references / Derived calculations
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / 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 / _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_comp_id / _struct_conn.ptnr2_auth_seq_id / _struct_conn.ptnr2_label_asym_id / _struct_conn.ptnr2_label_atom_id / _struct_conn.ptnr2_label_comp_id / _struct_conn.ptnr2_label_seq_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)22,20613
Polymers21,4132
Non-polymers79211
Water93752
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)44,64728
Polymers42,8264
Non-polymers1,82124
Water724
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
crystal symmetry operation2_445-x-1,-y-1,z1
crystal symmetry operation3_455-y-1,x,z1
crystal symmetry operation4_545y,-x-1,z1
Buried area6860 Å2
ΔGint-57 kcal/mol
Surface area17330 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)44,17524
Polymers42,8264
Non-polymers1,34920
Water724
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
crystal symmetry operation2_445-x-1,-y-1,z1
crystal symmetry operation3_455-y-1,x,z1
crystal symmetry operation4_545y,-x-1,z1
Buried area7140 Å2
ΔGint-54 kcal/mol
Surface area18490 Å2
MethodPISA
Unit cell
Length a, b, c (Å)67.990, 67.990, 89.168
Angle α, β, γ (deg.)90.000, 90.000, 90.000
Int Tables number79
Space group name H-MI4
Components on special symmetry positions
IDModelComponents
11A-1-

CS

21A-3-

CA

31A-5-

NA

41A-8-

NA

51B-2-

CS

61B-4-

CA

71B-6-

NA

81B-7-

NA

91A-504-

HOH

101B-503-

HOH

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Components

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Protein , 1 types, 2 molecules AB

#1: Protein Potassium channel protein


Mass: 10706.538 Da / Num. of mol.: 2 / Fragment: transmembrane domain, residues 19-110
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bacillus cereus (bacteria) / Plasmid: pQE60 / Production host: Escherichia coli (E. coli) / Strain (production host): SG13009 / References: UniProt: Q81HW2

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Non-polymers , 5 types, 63 molecules

#2: Chemical ChemComp-MPD / (4S)-2-METHYL-2,4-PENTANEDIOL


Mass: 118.174 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C6H14O2 / Comment: precipitant*YM
#3: Chemical ChemComp-CS / CESIUM ION


Mass: 132.905 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Cs
#4: Chemical ChemComp-CA / CALCIUM ION


Mass: 40.078 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Ca
#5: Chemical
ChemComp-NA / SODIUM ION


Mass: 22.990 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: Na
#6: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 52 / 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: 1

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Sample preparation

CrystalDensity Matthews: 2.41 Å3/Da / Density % sol: 48.88 %
Crystal growTemperature: 293 K / Method: vapor diffusion, sitting drop / pH: 7.5
Details: 100mM Hepes, 55-70% (4S)-2-Methyl-2,4-pentanediol (MPD), 10mM CaCl2, pH 7.5, VAPOR DIFFUSION, SITTING DROP, temperature 293K

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Data collection

DiffractionMean temperature: 100 K
Diffraction sourceSource: SYNCHROTRON / Site: APS / Beamline: 19-ID
DetectorType: ADSC QUANTUM 315 / Detector: CCD
RadiationProtocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthRelative weight: 1
ReflectionResolution: 2→50 Å / Num. obs: 13398

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Phasing

PhasingMethod: molecular replacement

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Processing

Software
NameVersionClassificationNB
DENZOdata reduction
SCALEPACKdata scaling
MOLREPphasing
CNSrefinement
PDB_EXTRACT3.006data extraction
RefinementMethod to determine structure: MOLECULAR REPLACEMENT / Resolution: 2→33.99 Å / Occupancy max: 1 / Occupancy min: 0.5 / σ(F): 0
RfactorNum. reflection% reflection
Rfree0.235 662 4.8 %
Rwork0.202 --
obs-13346 97.3 %
Solvent computationBsol: 113.782 Å2
Displacement parametersBiso max: 101.3 Å2 / Biso mean: 50.48 Å2 / Biso min: 23.96 Å2
Baniso -1Baniso -2Baniso -3
1-4.982 Å20 Å20 Å2
2--4.982 Å20 Å2
3----9.963 Å2
Refinement stepCycle: LAST / Resolution: 2→33.99 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms1464 0 8 76 1548
Refine LS restraints
Refine-IDTypeDev ideal
X-RAY DIFFRACTIONc_bond_d0.006
X-RAY DIFFRACTIONc_angle_deg1.099
Xplor file
Refine-IDSerial noParam file
X-RAY DIFFRACTION1protein_rep.param
X-RAY DIFFRACTION2ion.param
X-RAY DIFFRACTION3water_rep.param
X-RAY DIFFRACTION4MPD.par

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