3F2X

Crystal structure of the FMN riboswitch bound to FMN, Cs+ soak.

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5	293	0.1 M MES-Na pH 6.5 10% PEG 4000 0.1 M MgCl2, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
2.84	56.73

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 71.37	α = 90
b = 71.37	β = 90
c = 140.938	γ = 120

Symmetry
Space Group	P 31 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	CCD	ADSC QUANTUM 315		2007-12-02	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 24-ID-C	1.493786	APS	24-ID-C

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (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	3.1	20	99.4	0.121	47.3	10.8	8321	7822

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	3.1	3.21	94.3		0.629	2.9	6.4	776

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	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	MOLECULAR REPLACEMENT	THROUGHOUT	3F2Q	3.11	20	7482	7336	355	98.05	0.19332	0.19332	0.19229	0.21456	RANDOM	98.423

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]
-1.18	-0.59		-1.18		1.76

RMS Deviations
Key	Refinement Restraint Deviation
r_angle_refined_deg	1.058
r_scangle_it	0.728
r_scbond_it	0.433
r_nbtor_refined	0.271
r_nbd_refined	0.146
r_xyhbond_nbd_refined	0.132
r_symmetry_vdw_refined	0.112
r_chiral_restr	0.049
r_metal_ion_refined	0.034
r_symmetry_hbond_refined	0.005
r_bond_refined_d	0.004
r_gen_planes_refined	0.002

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms
Nucleic Acid Atoms	2353
Solvent Atoms	2
Heterogen Atoms	48

Software

Software
Software Name	Purpose
CBASS	data collection
MOLREP	phasing
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling