4NOI

2.17 Angstrom Crystal Structure of DNA-directed RNA Polymerase Subunit Alpha from Campylobacter jejuni.

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	6.5	295	Protein: 23 mG/mL, 0.25 M Sodium chloride, 0.01 M Tris-HCL buffer pH 8.3; Screen: PACT (F3), 0.2M Sodium iodine, 0.1M Bis-Tris propane pH 6.5, 20% (w/v) PEG 3350, VAPOR DIFFUSION, SITTING DROP, temperature 295K

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 99.173	α = 90
b = 62.743	β = 112.52
c = 93.621	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	CCD	MARMOSAIC 225 mm CCD	Beryllium lenses	2011-03-17	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 21-ID-F	0.97872	APS	21-ID-F

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	R Sym 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	2.17	30	99.4	0.077	0.077	21.1	3.1	54356	54356		-3	68.2

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.17	2.21	100		0.566	0.566	2.1	3.1	2715

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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	SAD	THROUGHOUT	2.17	29.49	26429	26429	1407	98.5	0.1762	0.1762	0.17363	0.22505	RANDOM	49.352

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]
1.93		-0.05	-1.91		0.01

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	29.204
r_dihedral_angle_4_deg	12.947
r_dihedral_angle_3_deg	11.161
r_long_range_B_refined	8.814
r_long_range_B_other	8.733
r_scangle_other	6.77
r_scbond_it	4.521
r_scbond_other	4.52
r_mcangle_it	4.135
r_mcangle_other	4.135
r_dihedral_angle_1_deg	3.287
r_mcbond_it	2.984
r_mcbond_other	2.977
r_angle_refined_deg	1.521
r_angle_other_deg	0.701
r_chiral_restr	0.086
r_gen_planes_refined	0.019
r_gen_planes_other	0.017
r_bond_refined_d	0.011
r_bond_other_d	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3560
Nucleic Acid Atoms
Solvent Atoms	217
Heterogen Atoms	17

Software

Software
Software Name	Purpose
Blu-Ice	data collection
SHELXS	phasing
REFMAC	refinement
HKL-3000	data reduction
HKL-3000	data scaling