4CI0

Electron cryo-microscopy of F420-reducing NiFe hydrogenase Frh

ELECTRON MICROSCOPY

Sample
F420 REDUCING HYDROGENASE

Specimen Preparation
Sample Aggregation State	PARTICLE
Vitrification Instrument	FEI VITROBOT MARK I
Cryogen Name	ETHANE
Sample Vitrification Details	VITRIFICATION 1 -- CRYOGEN- ETHANE, HUMIDITY- 70, TEMPERATURE- 103, INSTRUMENT- FEI VITROBOT MARK I, METHOD- BLOTTING 2.5 SECONDS BEFORE PLUNGING,

3D Reconstruction
Reconstruction Method	SINGLE PARTICLE
Number of Particles	26000
Reported Resolution (Å)	3.36
Resolution Method
Other Details	FRH IS A FRHABG DODECAMER WITH TETRAHEDRAL SYMMETRY. SUBMISSION BASED ON EXPERIMENTAL DATA FROM EMDB EMD-2513. (DEPOSITION ID: 12073).
Refinement Type
Symmetry Type	POINT
Point Symmetry	T

Map-Model Fitting and Refinement
Id	1 (3ZFS)
Refinement Space	REAL
Refinement Protocol	FLEXIBLE FIT
Refinement Target
Overall B Value
Fitting Procedure
Details	METHOD--FLEXIBLE REFINEMENT PROTOCOL--CRYO-EM

Data Acquisition
Detector Type	FEI FALCON II (4k x 4k)
Electron Dose (electrons/Å**2)	22

Imaging Experiment	1
Date of Experiment	2013-05-27
Temperature (Kelvin)	79
Microscope Model	FEI POLARA 300
Minimum Defocus (nm)	800
Maximum Defocus (nm)	2500
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS	2.2
Imaging Mode	BRIGHT FIELD
Specimen Holder Model
Nominal Magnification	78000
Calibrated Magnification	106000
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	300
Imaging Details	DATA WAS COLLECTED IN MOVIE MODE

EM Software
Task	Software Package	Version
MODEL FITTING	Coot
RECONSTRUCTION	RELION

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
	EACH IMAGE

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.