1RXK

crystal structure of streptavidin mutant (M3) a combination of M1+M2

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	8.6	293	1.5M AS, 0.1M Tris-HCl, pH 8.6, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
2.78	55.79

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 80.335	α = 90
b = 81.579	β = 90
c = 90.532	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	110	CCD	ADSC QUANTUM 4		2002-12-10	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-4	1.003	ESRF	ID14-4

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	1.7	56.8	97				31858	1	1

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.7	1.73	99.6

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 (All)	R-Factor (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	1.7	56.8	30020	1607	96.2	0.213	0.20153	0.19955	0.23905	RANDOM	17.869

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]
0.09			-1.4		1.31

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_1_deg	7.404
r_scangle_it	4.426
r_scbond_it	2.79
r_mcangle_it	1.996
r_angle_refined_deg	1.647
r_mcbond_it	1.126
r_angle_other_deg	0.863
r_symmetry_vdw_other	0.298
r_nbd_other	0.259
r_nbd_refined	0.187
r_xyhbond_nbd_refined	0.178
r_symmetry_hbond_refined	0.176
r_symmetry_vdw_refined	0.12
r_chiral_restr	0.115
r_nbtor_other	0.083
r_bond_refined_d	0.016
r_gen_planes_refined	0.007
r_bond_other_d	0.002
r_gen_planes_other	0.002
r_dihedral_angle_2_deg
r_dihedral_angle_3_deg
r_dihedral_angle_4_deg
r_nbtor_refined
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_hbond_other
r_mcbond_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	1835
Nucleic Acid Atoms
Solvent Atoms	153
Heterogen Atoms	50

Software

Software
Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing