Experiment: 7JKU

Crystal structure of a four-tetrad, parallel, and K+ stabilized Tetrahymena thermophila telomeric G-quadruplex

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	Other		TEL26-1

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5	293	sodium cacodylate, KCl, PEG, NaCl, ethylene glycol

Crystal Properties
Matthews coefficient	Solvent content
2.29	46.2

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 32.042	α = 90
b = 39.11	β = 90
c = 59.02	γ = 90

Symmetry
Space Group	P 2 21 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	196	CCD	ADSC QUANTUM 315		2020-05-27	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 24-ID-E	0.97918	APS	24-ID-E

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	1.97	59.02	97.9	0.994	7.7	6.3		5471			56.93

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.97	2.02			0.343

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	FREE R-VALUE	TEL26-1	1.97	32.6	1.35	5285	525	94.29	0.2484	0.2467	0.2461	0.2615	0.2674	74.16

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	36.7653
f_angle_d	0.7559
f_chiral_restr	0.0378
f_bond_d	0.0062
f_plane_restr	0.0042

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	524
Solvent Atoms	9
Heterogen Atoms	4

Software

Software
Software Name	Purpose
PHENIX	refinement
Coot	model building
XDS	data scaling
PHENIX	phasing
XDS	data reduction