9PIS | pdb_00009pis

Ab initio structure of crambin by MicroED at 0.85A

ELECTRON CRYSTALLOGRAPHY

---

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 41.49	α = 90
b = 18.79	β = 90.835
c = 22.52	γ = 90

Symmetry
Space Group	P 1 21 1

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
ELECTRON CRYSTALLOGRAPHY		FREE R-VALUE	0.85	22.518	22251	1143	71.965	0.156	0.1554	0.1792	0.1641	0.1848	random selection	4.58

Temperature Factor Modeling
Anisotropic B[1][1]	Anisotropic B[1][2]	Anisotropic B[1][3]	Anisotropic B[2][2]	Anisotropic B[2][3]	Anisotropic B[3][3]
-0.6		2.3	1.412		-0.813

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_6_deg	19.08
r_dihedral_angle_3_deg	10.292
r_lrange_it	6.814
r_dihedral_angle_2_deg	6.758
r_dihedral_angle_1_deg	5.806
r_lrange_other	4.511
r_rigid_bond_restr	2.953
r_scangle_it	2.029
r_scangle_other	2.025
r_angle_refined_deg	1.653
r_mcangle_it	1.572
r_mcangle_other	1.569
r_scbond_it	1.311
r_scbond_other	1.307
r_mcbond_it	1.041
r_mcbond_other	1.024
r_angle_other_deg	0.698
r_xyhbond_nbd_refined	0.288
r_nbd_refined	0.242
r_symmetry_nbd_refined	0.239
r_symmetry_xyhbond_nbd_refined	0.209
r_symmetry_nbd_other	0.18
r_nbd_other	0.178
r_nbtor_refined	0.159
r_chiral_restr	0.083
r_symmetry_nbtor_other	0.072
r_bond_refined_d	0.017
r_gen_planes_refined	0.009
r_gen_planes_other	0.002
r_bond_other_d

Sample
crambin

Specimen Preparation
Sample Aggregation State	3D ARRAY
Vitrification Instrument	LEICA EM GP
Cryogen Name	ETHANE
Sample Vitrification Details

3D Reconstruction
Reconstruction Method	CRYSTALLOGRAPHY
Number of Particles
Reported Resolution (Å)	0.85
Resolution Method	DIFFRACTION PATTERN/LAYERLINES
Other Details
Refinement Type
Symmetry Type	3D CRYSTAL
Space Group Name
Length a	41.49
Length b	18.79
Length c	18.79
Angle Alpha	90
Angle Beta	90.84
Angle Gamma	90

Map-Model Fitting and Refinement
Id	1
Refinement Space	RECIPROCAL
Refinement Protocol	AB INITIO MODEL
Refinement Target
Overall B Value	6
Fitting Procedure
Details

Data Acquisition
Detector Type	FEI FALCON IV (4k x 4k)
Electron Dose (electrons/Å**2)	0.01

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	TFS GLACIOS
Minimum Defocus (nm)
Maximum Defocus (nm)
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS
Imaging Mode	DIFFRACTION
Specimen Holder Model	FEI TITAN KRIOS AUTOGRID HOLDER
Nominal Magnification
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	200
Imaging Details

EM Software
Task	Software Package	Version
IMAGE ACQUISITION	SerialEM
MODEL FITTING	Coot
RECONSTRUCTION	Buccaneer
MODEL REFINEMENT	REFMAC

Image Processing
CTF Correction Type	CTF Correction Details	Number of Particles Selected	Particle Selection Details
NONE