2IZI

STREPTAVIDIN-BIOTIN PH 2.53 I4122 STRUCTURE

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		2.53		SYNTHETIC MOTHER LIQUOR = 75 % SATURATED AMMONIUM SULFATE, 25 % 1.0 M SODIUM ACETATE ADJUSTED TO PH 2.53. COMPLEX PRODUCED BY SOAKING STREPTAVIDIN-2-IMINOBIOTIN CO-CRYSTAL.

Crystal Properties
Matthews coefficient	Solvent content
2.99	40.1

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 57.7	α = 90
b = 57.7	β = 90
c = 186.07	γ = 90

Symmetry
Space Group	I 41 2 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray		IMAGE PLATE	RIGAKU RAXIS IV	MSC MIRRORS		M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RUH2R

Data Collection

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION		FREE R	1.5		2.4	12677		72	0.204	0.204	0.246

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	23.8
x_angle_deg	4.3
x_bond_d	0.018
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
x_improper_angle_d_na
x_improper_angle_d_prot
x_mcbond_it
x_mcangle_it
x_scbond_it
x_scangle_it

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	910
Nucleic Acid Atoms
Solvent Atoms	73
Heterogen Atoms	16

Software

Software
Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
bioteX	data reduction
X-PLOR	phasing