4BBO

Crystal structure of core-bradavidin

X-RAY DIFFRACTION

---

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP			ONE MICROLITER OF THE PROTEIN SOLUTION (LESS THAN 1 MG PER ML AND IN 50 MM SODIUM ACETATE, 100 MM NACL, PH 4) WAS CRYSTALLIZED BY ADDING ONE MICROLITER OF THE WELL SOLUTION (0.1 M HEPES PH 7.4, 0.8 M K,NA TARTRATE).HANGING DROPS AND VAPOUR DIFFUSION METHOD WAS USED AT RT. BEFORE CRYSTALLIZATION, 25 MICROLITERS OF THE PROTEIN SAMPLE WAS INCUBATED WITH 1 MICRO LITER OF BIOTIN SOLUTION (1 MG PER ML AND IN 5 MM TRIS PH 8.8, 8 MM CHES PH 9.5) FOR 3.5 HOURS AT 37 DEGREES OF CELCIUS.

Crystal Properties
Matthews coefficient	Solvent content
2	38.68

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 49.946	α = 90
b = 78.647	β = 90
c = 100.12	γ = 90

Symmetry
Space Group	P 21 21 21

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100				2005-04-21	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	MAX II BEAMLINE I711		MAX II	I711

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	1.6	25	100	0.09	18	9.6		52798		-3

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	1.6	1.7	100		0.55	4	9.6

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	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	MOLECULAR REPLACEMENT	THROUGHOUT	PDB ENTRY 2Y32	1.6	61.9	50108	2690	99.95	0.14843	0.14685	0.17863	RANDOM	14.577

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]
1.11			-0.78		-0.33

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	34.969
r_dihedral_angle_3_deg	10.92
r_dihedral_angle_1_deg	6.071
r_scangle_it	2.715
r_scbond_it	1.838
r_angle_refined_deg	1.457
r_mcangle_it	1.224
r_mcbond_it	0.626
r_chiral_restr	0.099
r_bond_refined_d	0.012
r_gen_planes_refined	0.006
r_bond_other_d
r_angle_other_deg
r_dihedral_angle_4_deg
r_gen_planes_other
r_nbd_refined
r_nbd_other
r_nbtor_refined
r_nbtor_other
r_xyhbond_nbd_refined
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_refined
r_symmetry_vdw_other
r_symmetry_hbond_refined
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_other
r_mcangle_other
r_scbond_other
r_scangle_other
r_long_range_B_refined
r_long_range_B_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3313
Nucleic Acid Atoms
Solvent Atoms	368
Heterogen Atoms	82

Software

Software
Software Name	Purpose
REFMAC	refinement
XDS	data reduction
PHASER	phasing