3G20

Crystal structure of the major pseudopilin from the type 2 secretion system of enterohaemorrhagic Escherichia coli

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	9.5	298	1.0M Na citrate, 0.1M CHES pH 9.5, VAPOR DIFFUSION, SITTING DROP, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
2.02	39.25

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 26.12	α = 106.94
b = 36.83	β = 99.05
c = 61.27	γ = 90.17

Symmetry
Space Group	P 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 325 mm CCD		2008-04-30	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SSRL BEAMLINE BL9-2	0.97945	SSRL	BL9-2

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	1.78	35.01	94.2	0.064			41532	39113		-3	23.85

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	1.78	1.82	88.8		0.545	1.8

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	PDB entry 3FU1	1.78	35.01	20713	19947	999	96.3	0.17	0.17	0.168	0.222	RANDOM	12.079

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]
-0.83	0.44	-0.04	0.63	-0.95	-0.36

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	31.815
r_dihedral_angle_4_deg	21.463
r_dihedral_angle_3_deg	12.22
r_dihedral_angle_1_deg	5.72
r_scangle_it	2.362
r_scbond_it	1.516
r_angle_refined_deg	1.227
r_angle_other_deg	0.85
r_mcangle_it	0.802
r_mcbond_it	0.413

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	31.815
r_dihedral_angle_4_deg	21.463
r_dihedral_angle_3_deg	12.22
r_dihedral_angle_1_deg	5.72
r_scangle_it	2.362
r_scbond_it	1.516
r_angle_refined_deg	1.227
r_angle_other_deg	0.85
r_mcangle_it	0.802
r_mcbond_it	0.413
r_mcbond_other	0.11
r_chiral_restr	0.068
r_bond_refined_d	0.009
r_gen_planes_refined	0.006
r_bond_other_d	0.001
r_gen_planes_other	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1852
Nucleic Acid Atoms
Solvent Atoms	266
Heterogen Atoms	37

Software

Software
Software Name	Purpose
XSCALE	data scaling
PHASER	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
Blu-Ice	data collection
XDS	data reduction

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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.