8RC1

MAP7 MTBD (microtubule binding domain) decorated microtubule protofilament

ELECTRON MICROSCOPY

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
in silico model	Other
in silico model	AlphaFold

Refinement

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	10.836
f_angle_d	0.445
f_chiral_restr	0.04
f_bond_d	0.003
f_plane_restr	0.003

Sample
Complex of MAP7 MTBD (microtubule binding domain) with 14pf microtubule

Specimen Preparation
Sample Aggregation State	FILAMENT
Vitrification Instrument	FEI VITROBOT MARK IV
Cryogen Name	ETHANE
Sample Vitrification Details	Microtubules stabilised by MAP7 MTBD were applied to a glow discharged grid, incubated for 30 seconds at room temperature following which excess sampl ...	Microtubules stabilised by MAP7 MTBD were applied to a glow discharged grid, incubated for 30 seconds at room temperature following which excess sample was wicked off and MAP7 MTBD was immediately added to the grid. After incubation for 60 seconds in a Vitrobot, excess liquid was blotted off and the grid was plunge frozen in liquid ethane.

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	39266
Reported Resolution (Å)	3.7
Resolution Method	FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type	POINT
Point Symmetry	C1

Map-Model Fitting and Refinement
Id	1
Refinement Space
Refinement Protocol
Refinement Target
Overall B Value
Fitting Procedure
Details

Data Acquisition
Detector Type	GATAN K3 BIOQUANTUM (6k x 4k)
Electron Dose (electrons/Å**2)	49.33

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI TITAN KRIOS
Minimum Defocus (nm)	600
Maximum Defocus (nm)	2400
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS
Imaging Mode	BRIGHT FIELD
Specimen Holder Model	FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification	81000
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details

EM Software
Task	Software Package	Version
PARTICLE SELECTION	RELION	3.1
IMAGE ACQUISITION	EPU
CTF CORRECTION	CTFFIND	4.1
MODEL FITTING	Coot	0.9.8.1
MODEL FITTING	ISOLDE
RECONSTRUCTION	RELION	3.1
MODEL REFINEMENT	PHENIX	1.20.1

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING AND AMPLITUDE CORRECTION		186522

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.