6QSY

Engineered streptavidin variant (H--WY) in complex with the Strep-tag II peptide

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1RST

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION	8.5	293	polyethylene glycol 8000, lithium sulfate, tris(hydroxymethyl)aminomethane

Crystal Properties
Matthews coefficient	Solvent content
2.55	51.73

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 57.26	α = 90
b = 57.26	β = 90
c = 174.82	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	CCD	MARMOSAIC 225 mm CCD	Si mirror	2013-12-12	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	BESSY BEAMLINE 14.2	0.91841	BESSY	14.2

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Sym I (Observed)	Rrim I (All)	Rpim I (All)	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	54.415	100	0.064	0.068	0.022	22	9.5		16563

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Rrim I (All)	Rpim I (All)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.7	1.79	100		0.286	0.286	0.303	0.097	2.7	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	1RST	1.7	54.415	15703	836	99.95	0.1609	0.16	0.1792	RANDOM	19.423

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]
0.04			0.04		-0.08

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	28.955
r_dihedral_angle_4_deg	21.729
r_dihedral_angle_3_deg	10.716
r_dihedral_angle_1_deg	7.213
r_angle_refined_deg	1.716
r_angle_other_deg	0.885
r_chiral_restr	0.102
r_bond_refined_d	0.013
r_gen_planes_refined	0.008
r_bond_other_d	0.002

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	28.955
r_dihedral_angle_4_deg	21.729
r_dihedral_angle_3_deg	10.716
r_dihedral_angle_1_deg	7.213
r_angle_refined_deg	1.716
r_angle_other_deg	0.885
r_chiral_restr	0.102
r_bond_refined_d	0.013
r_gen_planes_refined	0.008
r_bond_other_d	0.002
r_gen_planes_other	0.002

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	982
Nucleic Acid Atoms
Solvent Atoms	70
Heterogen Atoms	32

Software

Software
Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling
PHASER	phasing
PDB_EXTRACT	data extraction

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.