2QCB

T7-tagged full-length streptavidin complexed with ruthenium ligand

X-RAY DIFFRACTION

---

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5	298	protein, 26 mg/ml in water. 4-5x molar excess of ligand. reservoir, 1.0 M sodium citrate, 0.1 M cacodylate buffer, pH 6.5 , VAPOR DIFFUSION, HANGING DROP, temperature 298K

Crystal Properties
Matthews coefficient	Solvent content
2.3	46.48

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 57.651	α = 90
b = 57.651	β = 90
c = 183.823	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	100	IMAGE PLATE	RIGAKU RAXIS IV	mirrors	2006-05-15	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU MICROMAX-007	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	1.53	50	89.3	0.034	63.4	10.7	21478	21478			23

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	1.53	1.58	27.8		0.256	3.6	2.2	650

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	MOLECULAR REPLACEMENT	THROUGHOUT	1.65	19.9	19020	19020	970	99.08	0.169	0.169	0.168	0.187	RANDOM	14.954

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]
-0.03			-0.03		0.05

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	29.918
r_dihedral_angle_3_deg	12.49
r_dihedral_angle_4_deg	11.947
r_dihedral_angle_1_deg	6.372
r_sphericity_free	4.772
r_scangle_it	2.492
r_rigid_bond_restr	2.376
r_scbond_it	2.089
r_sphericity_bonded	2.043
r_angle_other_deg	2.009
r_angle_refined_deg	1.574
r_mcangle_it	1.497
r_mcbond_it	1.242
r_mcbond_other	0.319
r_symmetry_vdw_other	0.227
r_symmetry_vdw_refined	0.217
r_nbd_other	0.209
r_nbd_refined	0.206
r_nbtor_refined	0.19
r_symmetry_hbond_refined	0.152
r_xyhbond_nbd_refined	0.147
r_nbtor_other	0.091
r_chiral_restr	0.086
r_bond_refined_d	0.009
r_gen_planes_refined	0.004
r_bond_other_d	0.001
r_gen_planes_other	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	916
Nucleic Acid Atoms
Solvent Atoms	112
Heterogen Atoms	37

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
REFMAC	refinement
PDB_EXTRACT	data extraction
CrystalClear	data collection
HKL-2000	data reduction
HKL-2000	data scaling
MOLREP	phasing