6UUC

E. coli sigma-S transcription initiation complex with a 3-nt RNA and a mismatching ATP ("Fresh" crystal soaked with ATP for 2 hours)

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	5IPL

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	8	295	PEG3350, sodium chloride, HEPES

Crystal Properties
Matthews coefficient	Solvent content
2.71	54.61

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 133.096	α = 90
b = 154.918	β = 90
c = 231.775	γ = 90

Symmetry
Space Group	P 21 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	100	PIXEL	DECTRIS PILATUS 6M-F		2017-06-09	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	4.096	49.321	99.3	0.999	10.14	5		38147

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	4.096	4.34	97		0.108		5.06

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (All)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	FREE R-VALUE	5IPL	4.096	49.3	37791	1809	98.304	0.325	0.3218	0.3799	304.517

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]
0.083			0.539		-0.621

RMS Deviations
Key	Refinement Restraint Deviation
r_lrange_it	34.406
r_lrange_other	34.406
r_dihedral_angle_2_deg	19.706
r_mcangle_it	17.64
r_mcangle_other	17.64
r_dihedral_angle_3_deg	15.938
r_scangle_it	14.169
r_scangle_other	14.169
r_dihedral_angle_4_deg	12.909
r_mcbond_it	10.252
r_mcbond_other	10.252
r_scbond_it	7.794
r_scbond_other	7.788
r_dihedral_angle_1_deg	5.433
r_angle_refined_deg	1.161
r_metal_ion_refined	0.681
r_symmetry_xyhbond_nbd_refined	0.481
r_angle_other_deg	0.459
r_nbd_other	0.344
r_symmetry_nbd_refined	0.296
r_xyhbond_nbd_other	0.258
r_xyhbond_nbd_refined	0.243
r_nbd_refined	0.211
r_symmetry_nbd_other	0.21
r_symmetry_xyhbond_nbd_other	0.195
r_nbtor_refined	0.162
r_ncsr_local_group_1	0.106
r_gen_planes_refined	0.052
r_gen_planes_other	0.047
r_chiral_restr	0.043
r_bond_refined_d	0.005
r_bond_other_d	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	27482
Nucleic Acid Atoms	1453
Solvent Atoms
Heterogen Atoms	35

Software

Software
Software Name	Purpose
REFMAC	refinement
XDS	data reduction
XDS	data scaling
PHASER	phasing