4NQW

Structure of Mycobacterium tuberculosis extracytoplasmic function sigma factor SigK in complex with the cytosolic domain of its cognate anti-sigma factor RskA

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	Microbatch underoil	7.5	295	0.1M HEPES, 1M sodium acetate trihydrate, 0.05M cadmium sulphate hydrate, 12%(v/v) 2,5 hexanediol, pH 7.5, Microbatch underoil, temperature 295K

Crystal Properties
Matthews coefficient	Solvent content
1.97	37.57

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 57.39	α = 90
b = 57.39	β = 90
c = 150.87	γ = 90

Symmetry
Space Group	P 41 21 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	IMAGE PLATE	MAR scanner 345 mm plate		2010-01-28	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU MICROMAX-007 HF	1.5418

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	2.4	28.695		0.093	20.1	14.8	9753	9747

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	2.4	2.53	100		0.339	8.1		1480

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	SAD	THROUGHOUT	2.4	28.69	8305	916	87.82	0.21018	0.20463	0.25986	RANDOM	32.018

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]
0.05			0.05		-0.1

RMS Deviations
Key	Refinement Restraint Deviation
r_sphericity_free	33.799
r_dihedral_angle_2_deg	29.253
r_dihedral_angle_3_deg	16.172
r_sphericity_bonded	12.088
r_dihedral_angle_4_deg	11.957
r_dihedral_angle_1_deg	4.052
r_rigid_bond_restr	1.602
r_angle_refined_deg	0.842
r_angle_other_deg	0.727
r_chiral_restr	0.046

RMS Deviations
Key	Refinement Restraint Deviation
r_sphericity_free	33.799
r_dihedral_angle_2_deg	29.253
r_dihedral_angle_3_deg	16.172
r_sphericity_bonded	12.088
r_dihedral_angle_4_deg	11.957
r_dihedral_angle_1_deg	4.052
r_rigid_bond_restr	1.602
r_angle_refined_deg	0.842
r_angle_other_deg	0.727
r_chiral_restr	0.046
r_bond_refined_d	0.005
r_gen_planes_refined	0.003
r_bond_other_d	0.001
r_gen_planes_other	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1740
Nucleic Acid Atoms
Solvent Atoms	89
Heterogen Atoms	10

Software

Software
Software Name	Purpose
MAR345dtb	data collection
SOLVE	phasing
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.