1CII

COLICIN IA

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	vapor diffusion - hanging drop - streak seeding	5.2		PROTEIN WAS CRYSTALLIZED BY HANGING-DROP VAPOR DIFFUSION AGAINST RESERVOIRS OF 1.0 M NH4(SO4)2, 20 MM NA-CITRATE (PH 5.2), 200 MM NACL, STARTING WITH 6 MICROLITERS OF PROTEIN AT 2 MG/ML IN 20 MM NA-CITRATE (PH 5.2), 200 MM NACL, 5 MM DTT, AND 4 MICROLITERS RESERVOIR SOLUTION. THESE DROPS OF MUTANT PROTEIN WERE STREAK-SEEDED FROM STOCKS GENERATED FROM CRUSHED DIFFRACTION-QUALITY WILD-TYPE COLICIN IA CRYSTALS. CRYSTALS WERE HARVESTED TO 1.1 M NA2SO4, 200 MM NACL, 20 MM NA-CITRATE (PH 5.2), AND 5 MM DTT. FOR DERIVATIZATION, CRYSTALS WERE WASHED IN DTT-FREE HARVEST BUFFER AND SOAKED FOR ONE WEEK IN 1 MM CH3HGCL., vapor diffusion - hanging drop - streak seeding

Crystal Properties
Matthews coefficient	Solvent content
5.9	78

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 64.4	α = 90
b = 178.6	β = 90
c = 285.5	γ = 90

Symmetry
Space Group	C 2 2 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	90	IMAGE PLATE	MAR scanner 300 mm plate	PT-COATED FUSED SILICA MIRROR	1994-04-21	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SSRL BEAMLINE BL7-1		SSRL	BL7-1

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	3	25	84	0.13	0.13	5.7	3.4		28266

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)
	3	3.11	73		0.309	0.309	1.7	2.3

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	MIR	THROUGHOUT	3	8	28260	2000	84.1	0.241	0.241	0.312	RANDOM	66.5

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]

RMS Deviations
Key	Refinement Restraint Deviation
x_dihedral_angle_d	19.34
x_scbond_it	2
x_scangle_it	2
x_improper_angle_d	1.53
x_mcbond_it	1.5
x_mcangle_it	1.5
x_angle_deg	1.48
x_bond_d	0.009
x_bond_d_na
x_bond_d_prot
x_angle_d
x_angle_d_na
x_angle_d_prot
x_angle_deg_na
x_angle_deg_prot
x_dihedral_angle_d_na
x_dihedral_angle_d_prot
x_improper_angle_d_na
x_improper_angle_d_prot

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4714
Nucleic Acid Atoms
Solvent Atoms
Heterogen Atoms

Software

Software
Software Name	Purpose
PHASES	phasing
SOLOMON	phasing
X-PLOR	model building
XTALVIEW	refinement
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	phasing