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CryoEM structure of MyosinVI-actin complex in the rigor (nucleotide-free) state, backbone-averaged with side chains truncated to alanine
ELECTRON MICROSCOPY
Sample
myosin VI-actin in the rigor (nucleotide-free) state
Sample Components
myosin VI
actin
calmodulin
Specimen Preparation
Sample Aggregation State
FILAMENT
Vitrification Instrument
LEICA EM GP
Cryogen Name
ETHANE
Sample Vitrification Details
Sample was applied to a glow-discharged holey carbon grid. 3 uL actin was incubated for 60 seconds. 3 uL of myosin VI was added and incubated for 60 ...
Sample was applied to a glow-discharged holey carbon grid. 3 uL actin was incubated for 60 seconds. 3 uL of myosin VI was added and incubated for 60 seconds. 3 uL solution was removed. An additional 3 uL of myosin VI was applied. After 60 seconds, 3 uL solution was removed, and the grid was blotted for 3 seconds from the backside with filter paper.
3D Reconstruction
Reconstruction Method
HELICAL
Number of Particles
56116
Reported Resolution (Å)
4.6
Resolution Method
FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type
HELICAL
Axial Symmetry
C1
Axial Rise
28.06
Angular Rotation
-166.73
Map-Model Fitting and Refinement
Id
1
Refinement Space
REAL
Refinement Protocol
FLEXIBLE FIT
Refinement Target
Overall B Value
150
Fitting Procedure
Details
2BKI chain B was grafted onto Chains A-F of 6BNP, then assembled by rigid body docking into the 7.5 A low pass-filtered density map, followed by flexi ...
2BKI chain B was grafted onto Chains A-F of 6BNP, then assembled by rigid body docking into the 7.5 A low pass-filtered density map, followed by flexible fitting with DireX. The resulting model was subjected to MDFF using the 7.5 A low pass-filtered density map. Atomistic models were backbone-averaged in Phenix and side chains were truncated to alanine. This treatment has resulted in the errors noted in the associated caveats.
Data Acquisition
Detector Type
GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å**2)
1.5
Imaging Experiment
1
Date of Experiment
Temperature (Kelvin)
Microscope Model
FEI TECNAI 20
Minimum Defocus (nm)
1500
Maximum Defocus (nm)
3000
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS
2
Imaging Mode
BRIGHT FIELD
Specimen Holder Model
GATAN 626 SINGLE TILT LIQUID NITROGEN CRYO TRANSFER HOLDER