Experiment: 7TZR

Crystal structure of the E. coli thiM riboswitch bound to N-methyl-1-(quinoxalin-6-yl)methanamine (compound 16)

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	2GDI

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	4.8	291	TPP riboswitch RNA (0.2 mM) and 16 (2 mM) were heated in a buffer containing 50 mM potassium acetate (pH 6.8) and 3 (compound 16) mM MgCl2. Reservoir solution containing 0.1 M sodium acetate (pH 4.8), 0.35 M ammonium acetate, and 28% (v/v) PEG4000

Crystal Properties
Matthews coefficient	Solvent content
2.03	39.48

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 150.156	α = 90
b = 29.608	β = 94.321
c = 95.507	γ = 90

Symmetry
Space Group	C 1 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 EIGER X 16M		2019-03-29	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	NSLS-II BEAMLINE 17-ID-2	0.9252	NSLS-II	17-ID-2

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	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	2.7	30	95.2	0.152	0.101	0.981	9.9	2.9		11400			42.65

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Rpim I (All)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.7	2.8	92.3		0.581	0.407	0.656	1.3	2.5

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	2GDI	2.7	29.05	1.36	11382	1153	94.47	0.2095	0.2036	0.2044	0.2609	0.2619	43.91

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	18.8432
f_angle_d	0.8475
f_chiral_restr	0.039
f_plane_restr	0.0057
f_bond_d	0.0032

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	3399
Solvent Atoms	34
Heterogen Atoms	29

Software

Software
Software Name	Purpose
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHASER	phasing
Coot	model building