8SH0

Structure of human POT1 DNA binding domain bound to a 5'-phosphorylated junction of a telomeric DNA hairpin with a 3'-overhang

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8	289	hDBD complex with 5prime-p-hp-ss1-12 was crystallized at 16C by the hanging drop method in a drop containing 0.8 microliter of 13 mg/ml protein-DNA complex (in 25 mM Tris (pH 8), 100 mM NaCl, and 2 mM DTT) and 0.8 microliter well solution (0.1 M NaOAc (pH 5.2) and 10% PEG 20,000). Crystals were harvested in 25 mM Tris (pH 8), 100 mM NaCl, 0.1 M NaOAc (pH 5.2), and 10% PEG 20,000 and cryoprotected in harvesting solution supplemented with 30% ethylene glycol

Crystal Properties
Matthews coefficient	Solvent content
2.33	47.31

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 67.23	α = 90
b = 67.23	β = 90
c = 143.373	γ = 120

Symmetry
Space Group	P 32 2 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 EIGER2 X 9M		2022-07-28	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 21-ID-D	1.12723	APS	21-ID-D

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	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	2.16	71.69	100	0.086	0.999	19.6	19.3		20897

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.16	2.23			1.131	0.858

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	MOLECULAR REPLACEMENT	FREE R-VALUE	2.16	45.19	1.34	20846	1745	99.96	0.1818	0.18	0.2214	63.64

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	18.9007
f_angle_d	0.6461
f_chiral_restr	0.0443
f_plane_restr	0.0043
f_bond_d	0.0034

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2339
Nucleic Acid Atoms	420
Solvent Atoms	120
Heterogen Atoms	12

Software

Software
Software Name	Purpose
PHENIX	refinement
MOSFLM	data reduction
Aimless	data scaling
PHASER	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.