8QAB

X-ray crystal structure of a de novo designed antiparallel coiled-coil hexameric alpha-helical barrel with 4 heptad repeats, apCCHex

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP		293	0.1 M Potassium thiocyanate, 30 % w/v PEG 2000 MME

Crystal Properties
Matthews coefficient	Solvent content
1.83	32.7

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 46.078	α = 90
b = 30.914	β = 88.642
c = 51.953	γ = 90

Symmetry
Space Group	P 1 21 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	PIXEL	DECTRIS PILATUS3 6M		2021-01-29	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	DIAMOND BEAMLINE I24	0.85	Diamond	I24

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	Rpim 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	1.4	34.88	99.83	0.03595	0.03944	0.01597	1	22.17	6		29174			20.99

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	Rpim I (All)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.4	1.45	99.2		0.8515	0.9542	0.421	0.625	0.67

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
X-RAY DIFFRACTION	AB INITIO PHASING	FREE R-VALUE	1.4	34.88	1.94	29127	1415	99.83	0.1746	0.1739	0.1886	28.45

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	4.874
f_angle_d	1.1194
f_chiral_restr	0.048
f_bond_d	0.0105
f_plane_restr	0.0064

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1280
Nucleic Acid Atoms
Solvent Atoms	143
Heterogen Atoms	36

Software

Software
Software Name	Purpose
PHENIX	refinement
DIALS	data reduction
DIALS	data scaling
Arcimboldo	phasing

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.