5K7L

Single particle cryo-EM structure of the voltage-gated K+ channel Eag1 bound to the channel inhibitor calmodulin


ELECTRON MICROSCOPY

Refinement

RMS Deviations
KeyRefinement Restraint Deviation
r_dihedral_angle_2_deg30.68
r_long_range_B_refined29.639
r_long_range_B_other29.638
r_scangle_other26.614
r_scbond_it19.895
r_scbond_other19.891
r_mcangle_it16.95
r_mcangle_other16.949
r_dihedral_angle_3_deg15.408
r_dihedral_angle_4_deg12.017
RMS Deviations
KeyRefinement Restraint Deviation
r_dihedral_angle_2_deg30.68
r_long_range_B_refined29.639
r_long_range_B_other29.638
r_scangle_other26.614
r_scbond_it19.895
r_scbond_other19.891
r_mcangle_it16.95
r_mcangle_other16.949
r_dihedral_angle_3_deg15.408
r_dihedral_angle_4_deg12.017
r_mcbond_it10.272
r_mcbond_other10.264
r_dihedral_angle_1_deg4.765
r_angle_refined_deg1.188
r_angle_other_deg0.909
r_chiral_restr0.071
r_bond_refined_d0.007
r_gen_planes_refined0.004
r_bond_other_d0.001
r_gen_planes_other0.001
r_nbd_refined
r_nbd_other
r_nbtor_refined
r_nbtor_other
r_xyhbond_nbd_refined
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_refined
r_symmetry_vdw_other
r_symmetry_hbond_refined
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_scangle_it
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded
Sample
Voltage-gated K+ channel Eag1 bound to the channel inhibitor calmodulin
Sample Components
Voltage-gated potassium channel Eag1
Calmodulin
Specimen Preparation
Sample Aggregation StatePARTICLE
Vitrification InstrumentFEI VITROBOT MARK IV
Cryogen NameETHANE
Sample Vitrification DetailsPlunged into liquid ethane (FEI VITROBOT MARK IV)
3D Reconstruction
Reconstruction MethodSINGLE PARTICLE
Number of Particles145000
Reported Resolution (Å)3.78
Resolution MethodFSC 0.143 CUT-OFF
Other Details2D classification, 3D classification, and refinement were performed in RELION. Final map generation was performed in FREALIGN.
Refinement Type
Symmetry TypePOINT
Point SymmetryC4
Map-Model Fitting and Refinement
Id1
Refinement SpaceRECIPROCAL
Refinement ProtocolAB INITIO MODEL
Refinement Target
Overall B Value
Fitting Procedure
Details
Data Acquisition
Detector TypeGATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å**2)1.8
Imaging Experiment1
Date of Experiment
Temperature (Kelvin)
Microscope ModelFEI TITAN KRIOS
Minimum Defocus (nm)1500
Maximum Defocus (nm)3000
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS
Imaging ModeBRIGHT FIELD
Specimen Holder ModelFEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification
Calibrated Magnification
SourceFIELD EMISSION GUN
Acceleration Voltage (kV)300
Imaging Details
EM Software
TaskSoftware PackageVersion
PARTICLE SELECTIONRELION1.4
CTF CORRECTIONCTFFIND44
MODEL FITTINGCoot
INITIAL EULER ASSIGNMENTRELION1.4
FINAL EULER ASSIGNMENTRELION1.4
FINAL EULER ASSIGNMENTFREALIGN
RECONSTRUCTIONFREALIGN
MODEL REFINEMENTREFMAC
Image Processing
CTF Correction TypeCTF Correction DetailsNumber of Particles SelectedParticle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION240000Particles were auto-picked and manually inspected in RELION.