1RXJ

Crystal structure of streptavidin mutant (M2) where the L3,4 loop was replace by that of avidin

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5	293	PEG 4000, 0.1M NaAc, 0.1M NaCac, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 293K

Crystal Properties
Matthews coefficient	Solvent content
2.19	43.71

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 46.355	α = 90
b = 85.08	β = 98.17
c = 57.694	γ = 90

Symmetry
Space Group	P 1 21 1

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)	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	1.14	56.8		0.037	12.4	2		148143	1	1

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	1.14	56.8	148143	7818	96.97	0.182	0.18022	0.17914	0.20029	RANDOM	13.743

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]
-0.08		-0.23	0.39		-0.37

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_1_deg	6.985
r_scangle_it	2.47
r_sphericity_bonded	2.121
r_sphericity_free	2.092
r_scbond_it	1.593
r_mcangle_it	1.418
r_angle_refined_deg	1.247
r_rigid_bond_restr	0.874
r_mcbond_it	0.841
r_angle_other_deg	0.763
r_nbd_other	0.259
r_nbd_refined	0.188
r_symmetry_vdw_other	0.174
r_xyhbond_nbd_refined	0.135
r_symmetry_vdw_refined	0.115
r_nbtor_other	0.083
r_symmetry_hbond_refined	0.079
r_chiral_restr	0.078
r_bond_refined_d	0.007
r_gen_planes_refined	0.004
r_gen_planes_other	0.003
r_bond_other_d	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

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3559
Nucleic Acid Atoms
Solvent Atoms	598
Heterogen Atoms	100

Software

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