3KBT

Crystal structure of the ankyrin binding domain of human erythroid beta spectrin (repeats 13-15) in complex with the spectrin binding domain of human erythroid ankyrin (ZU5-ANK)

X-RAY DIFFRACTION

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5	283	Protein complex at 7.5 mg/mL mixed 1:1 with 0.05 M MES pH 6.5, 0.2 M ammonium acetate, 0.01 M calcium chloride, 10% PEG-4000, 5 mM dithiothreitol, VAPOR DIFFUSION, HANGING DROP, temperature 283K

Crystal Properties
Matthews coefficient	Solvent content
2.71	54.54

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 90.45	α = 90
b = 95.66	β = 90
c = 137.93	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	CCD	RAYONIX MX-225		2008-12-21	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 21-ID-F	0.97872	APS	21-ID-F

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	2.75	40	96.5	0.047	20.2	3.9	31768	30405			33.3

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.75	2.87	98		0.308	4.6	4

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 (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	SAD	THROUGHOUT	2.75	37.82	28791	1572	95.7	0.24728	0.24483	0.29216	RANDOM	33.255

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]
-0.44			-0.03		0.47

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.124
r_dihedral_angle_4_deg	20.046
r_dihedral_angle_3_deg	18.07
r_dihedral_angle_1_deg	8.627
r_scangle_it	3.4
r_scbond_it	1.939
r_angle_refined_deg	1.475
r_mcangle_it	1.127
r_mcbond_it	0.547
r_chiral_restr	0.105

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	35.124
r_dihedral_angle_4_deg	20.046
r_dihedral_angle_3_deg	18.07
r_dihedral_angle_1_deg	8.627
r_scangle_it	3.4
r_scbond_it	1.939
r_angle_refined_deg	1.475
r_mcangle_it	1.127
r_mcbond_it	0.547
r_chiral_restr	0.105
r_bond_refined_d	0.014
r_gen_planes_refined	0.007

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	7076
Nucleic Acid Atoms
Solvent Atoms
Heterogen Atoms

Software

Software
Software Name	Purpose
MAR345	data collection
SHARP	phasing
REFMAC	refinement
XDS	data reduction
SCALA	data scaling

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), 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.