6M9J

Racemic-GSTSTA from degenerate octameric repeats in InaZ, residues 707-712

ELECTRON CRYSTALLOGRAPHY

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 14.03	α = 90
b = 9.22	β = 104.48
c = 20.77	γ = 90

Symmetry
Space Group	P 1 21/c 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	electron					2017-11-27

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	CC (Half)	Net I Over Average Sigma (I)	Redundancy	Number Reflections (All)	Number Reflections (Observed)	Observed Criterion Sigma (F)	Observed Criterion Sigma (I)	B (Isotropic) From Wilson Plot
1	0.9	7.629	77.6	0.128	0.151	0.991	5.46	3.401		2906			46.14

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	0.9	0.92	79.9		0.332	0.387	0.962	2.52	3.165

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	Mean Isotropic B
ELECTRON CRYSTALLOGRAPHY		THROUGHOUT	0.9	7.629	1.4	2896	290	77.43	0.2342	0.2325	0.2518	3.552

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]

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	7.023
f_angle_d	1.119
f_chiral_restr	0.071
f_bond_d	0.008
f_plane_restr	0.004

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	36
Nucleic Acid Atoms
Solvent Atoms	3
Heterogen Atoms

Software

Software
Software Name	Purpose
XSCALE	data scaling
PHENIX	refinement
PDB_EXTRACT	data extraction
XDS	data reduction
SHELXD	phasing

Sample
L-GSTSTA from ice nucleation protein, inaZ, and its enantiomer, D-GSTSTA

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

3D Reconstruction
Reconstruction Method	CRYSTALLOGRAPHY
Number of Particles
Reported Resolution (Å)
Resolution Method	DIFFRACTION PATTERN/LAYERLINES
Other Details
Refinement Type
Symmetry Type	3D CRYSTAL
Space Group Name
Length a	14.03
Length b	9.22
Length c	9.22
Angle Alpha	90
Angle Beta	104.5
Angle Gamma	90

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

Data Acquisition
Detector Type	TVIPS TEMCAM-F416 (4k x 4k)
Electron Dose (electrons/Å**2)	0.01

Imaging Experiment	1
Date of Experiment
Temperature (Kelvin)
Microscope Model	FEI TECNAI F20
Minimum Defocus (nm)
Maximum Defocus (nm)
Minimum Tilt Angle (degrees)
Maximum Tilt Angle (degrees)
Nominal CS
Imaging Mode	DIFFRACTION
Specimen Holder Model
Nominal Magnification
Calibrated Magnification
Source	FIELD EMISSION GUN
Acceleration Voltage (kV)	200
Imaging Details

EM Software
Task	Software Package	Version
MODEL FITTING	Coot	0.8.9.1
CRYSTALLOGRAPHY MERGING	XSCALE
RECONSTRUCTION	SHELXD
MODEL REFINEMENT	PHENIX	1.12_2829

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

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.