5NMS

Hsp21 dodecamer, structural model based on cryo-EM and homology modelling

ELECTRON MICROSCOPY

Sample
Hsp21 dodecamer, a chloroplast small heat shock protein chaperone

Specimen Preparation
Sample Aggregation State	PARTICLE
Vitrification Instrument	FEI VITROBOT MARK I
Cryogen Name	ETHANE
Sample Vitrification Details

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	18407
Reported Resolution (Å)	10
Resolution Method	FSC 0.143 CUT-OFF
Other Details
Refinement Type
Symmetry Type	POINT
Point Symmetry	D3

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

Data Acquisition
Detector Type	DIRECT ELECTRON DE-20 (5k x 3k)
Electron Dose (electrons/Å**2)	1.4

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	JEOL 2100F
Minimum Defocus (nm)
Maximum Defocus (nm)
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS
Imaging Mode	BRIGHT FIELD
Specimen Holder Model
Nominal Magnification
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	200
Imaging Details

EM Software
Task	Software Package	Version
PARTICLE SELECTION	EMAN	2
IMAGE ACQUISITION	EMAN	2
CTF CORRECTION	EMAN	2
MODEL FITTING	UCSF Chimera	11
INITIAL EULER ASSIGNMENT	EMAN	2
FINAL EULER ASSIGNMENT	RELION	3
RECONSTRUCTION	RELION	3

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
PHASE FLIPPING ONLY		33456

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 R01GM133198.