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- PDB-3e8h: Crystal Structure of the the open NaK channel-K+ complex -

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Basic information

Entry
Database: PDB / ID: 3e8h
TitleCrystal Structure of the the open NaK channel-K+ 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 / identical protein binding / membrane / 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
: / Potassium channel protein
Similarity search - Component
Biological speciesBacillus cereus (bacteria)
MethodX-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / molecular replacement / Resolution: 1.8 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 / 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_comp_id / _pdbx_struct_conn_angle.ptnr1_auth_seq_id / _pdbx_struct_conn_angle.ptnr1_label_comp_id / _pdbx_struct_conn_angle.ptnr1_label_seq_id / _pdbx_struct_conn_angle.ptnr2_auth_seq_id / _pdbx_struct_conn_angle.ptnr2_label_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_atom_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_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

Downloads & links

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Assembly

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


Theoretical massNumber of molelcules
Total (without water)22,27716
Polymers21,4132
Non-polymers86414
Water1,72996
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)44,71036
Polymers42,8264
Non-polymers1,88432
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 area6950 Å2
ΔGint-58 kcal/mol
Surface area17270 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)44,39728
Polymers42,8264
Non-polymers1,57124
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 area7160 Å2
ΔGint-54 kcal/mol
Surface area18520 Å2
MethodPISA
Unit cell
Length a, b, c (Å)68.194, 68.194, 89.294
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-

K

21A-3-

K

31A-4-

K

41A-5-

K

51A-9-

K

61A-10-

K

71B-2-

K

81B-6-

K

91B-7-

K

101B-8-

K

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Components

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


Mass: 118.174 Da / Num. of mol.: 4 / Source method: obtained synthetically / Formula: C6H14O2 / Comment: precipitant*YM
#3: Chemical
ChemComp-K / POTASSIUM ION


Mass: 39.098 Da / Num. of mol.: 10 / Source method: obtained synthetically / Formula: K
#4: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 96 / 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: 2.42 Å3/Da / Density % sol: 49.26 %
Crystal growTemperature: 293 K / Method: vapor diffusion, sitting drop / pH: 7.5
Details: 100mM GHepes buffer, 55-70% (4S)-2-Methyl-2,4-pentanediol (MPD), 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-BM
DetectorType: SBC-3 / Detector: CCD
RadiationProtocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray
Radiation wavelengthRelative weight: 1
ReflectionResolution: 1.8→50 Å / Num. obs: 18948

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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: 1.8→34.1 Å / Occupancy max: 1 / Occupancy min: 0.5 / σ(F): 0
RfactorNum. reflection% reflection
Rfree0.234 960 5.1 %
Rwork0.212 --
obs-18901 99.8 %
Solvent computationBsol: 153.066 Å2
Displacement parametersBiso max: 92.59 Å2 / Biso mean: 36.415 Å2 / Biso min: 7.8 Å2
Baniso -1Baniso -2Baniso -3
1--0.285 Å20 Å20 Å2
2---0.285 Å20 Å2
3---0.57 Å2
Refinement stepCycle: LAST / Resolution: 1.8→34.1 Å
ProteinNucleic acidLigandSolventTotal
Num. atoms1466 0 10 128 1604
Refine LS restraints
Refine-IDTypeDev idealDev ideal target
X-RAY DIFFRACTIONc_mcbond_it2.4083
X-RAY DIFFRACTIONc_scbond_it3.9015
X-RAY DIFFRACTIONc_mcangle_it3.1624
X-RAY DIFFRACTIONc_scangle_it5.2246
Xplor file
Refine-IDSerial noParam file
X-RAY DIFFRACTION1protein_rep.param
X-RAY DIFFRACTION2water.param
X-RAY DIFFRACTION3ion.param
X-RAY DIFFRACTION4MPD.par

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