9CMM | pdb_00009cmm

Two protofilament structure of alpha1B and betaI/IVb microtubule bound to GMPCPP

ELECTRON MICROSCOPY

---

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	5N5N

Sample
alpha1B and betaI/IVb microtubule

Specimen Preparation
Sample Aggregation State	FILAMENT
Vitrification Instrument	LEICA EM GP
Cryogen Name	ETHANE
Sample Vitrification Details	Double-cycled GMPCPP microtubules were diluted to 2.5uM in Brb80 buffer. 5 ul of microtubules were applied to glow-discharged cryo-EM grid and allowed to absorb for 30 sec.

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	1279335
Reported Resolution (Å)	3.1
Resolution Method	FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type	POINT
Point Symmetry	C1

Map-Model Fitting and Refinement
Id	1 (9BP6)
Refinement Space	REAL
Refinement Protocol	FLEXIBLE FIT
Refinement Target	Cross-correlation
Overall B Value	80
Fitting Procedure
Details

Data Acquisition
Detector Type	GATAN K2 SUMMIT (4k x 4k)
Electron Dose (electrons/Å**2)	56

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	TFS KRIOS
Minimum Defocus (nm)	500
Maximum Defocus (nm)	2500
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS	2.7
Imaging Mode	BRIGHT FIELD
Specimen Holder Model
Nominal Magnification	130000
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details

EM Software
Task	Software Package	Version
PARTICLE SELECTION	RELION	3.0
IMAGE ACQUISITION	SerialEM
CTF CORRECTION	Gctf
MODEL FITTING	Coot
MODEL FITTING	ISOLDE
INITIAL EULER ASSIGNMENT	RELION	3.0
FINAL EULER ASSIGNMENT	RELION	3.0
RECONSTRUCTION	RELION	3.0
MODEL REFINEMENT	PHENIX	1.20.1_4487:

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION		124408	Manual picking