6UU8

E. coli mutant sigma-S transcription initiation complex with a 7-nt RNA ("Fresh" mutant crystal soaked with GTP, UTP, and CTP for 30 minutes)

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
2.75	55.26

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 133.46	α = 90
b = 154.504	β = 90
c = 235.697	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		2017-10-12	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 24-ID-E	0.97910	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	4.4	49.4	99.4	0.998	6.92	6		31470

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	4.4	4.66	97.2		0.178	0.44	5.9

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	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	FREE R-VALUE	5IPL	4.4	49.378	31350	1496	99.04	0.358	0.3572	0.3796	0	270.499

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]
20.221			-6.7		-13.521

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	28.583
r_dihedral_angle_3_deg	19.673
r_dihedral_angle_4_deg	17.559
r_lrange_it	12.709
r_lrange_other	12.709
r_dihedral_angle_1_deg	6.672
r_mcangle_it	5.766
r_mcangle_other	5.765
r_scangle_it	4.898
r_scangle_other	4.897
r_mcbond_it	3.274
r_mcbond_other	3.274
r_scbond_it	2.67
r_scbond_other	2.67
r_angle_refined_deg	1.602
r_angle_other_deg	1.331
r_symmetry_xyhbond_nbd_refined	0.458
r_nbd_other	0.349
r_symmetry_nbd_refined	0.312
r_xyhbond_nbd_refined	0.278
r_symmetry_nbd_other	0.246
r_nbd_refined	0.231
r_xyhbond_nbd_other	0.214
r_symmetry_xyhbond_nbd_other	0.205
r_nbtor_refined	0.159
r_ncsr_local_group_1	0.15
r_chiral_restr	0.078
r_gen_planes_refined	0.027
r_gen_planes_other	0.024
r_bond_refined_d	0.009
r_bond_other_d	0.002

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	27511
Nucleic Acid Atoms	1407
Solvent Atoms
Heterogen Atoms	13

Software

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