3TNU

Heterocomplex of coil 2B domains of human intermediate filament proteins, keratin 5 (KRT5) and keratin 14 (KRT14)

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8.5	293.2	K5/K14 2B protein solution (9 mg/mL) was mixed with an equal volume of reservoir solution containing 2.8M NaCl and 0.1M Tris-HCl (pH 8.5). Small crystals formed and were used to seed the same mixture of protein solution/reservoir solution, which yielded larger crystals, VAPOR DIFFUSION, HANGING DROP, temperature 293.2K

Crystal Properties
Matthews coefficient	Solvent content
5.11	75.93

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 150.991	α = 90
b = 150.991	β = 90
c = 141.623	γ = 120

Symmetry
Space Group	H 3 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray						M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 23-ID-B	0.97944	APS	23-ID-B

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	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	3.005	50	98.8			12377	12376

Refinement

Statistics
Diffraction ID	Structure Solution Method	Resolution (High)	Resolution (Low)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	SAD	3.005	40.528	12532	11603	578	92.65	0.2103	0.2103	0.2091	0.2335	RANDOM

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]
10.5727			10.5727		-21.1453

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	16.04
f_angle_d	0.821
f_chiral_restr	0.051
f_bond_d	0.006
f_plane_restr	0.002

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1504
Nucleic Acid Atoms
Solvent Atoms	6
Heterogen Atoms

Software

Software
Software Name	Purpose
PHENIX	refinement

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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.