7KFX

Structural basis for a germline-biased antibody response to SARS-CoV-2 (RBD:C1A-C2 Fab)

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	7KFV

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.6	293	protein sample: 13 mg/mL in 150mM NaCl, 25 mM Tris-HCl pH 7.5 mother liquor composition (equal volume): 0.03 M Citric acid, 0.07M BIS-TRIS propane/pH 7.6, 20% (w/v) PEG 3350

Crystal Properties
Matthews coefficient	Solvent content
3.13	60.72

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 83.455	α = 90
b = 149.192	β = 90
c = 146.143	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	80	PIXEL	DECTRIS EIGER X 16M		2020-08-05	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 24-ID-C	0.9792	APS	24-ID-C

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	CC (Half)	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	2.22	200	99.1	0.136	0.159	0.995	6.86	3.58		44541		-3

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.22	2.36	97.1		0.251	0.61	3.56

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	7KFV	2.226	74.6	44541	2121	98.9	0.1926	0.1909	0.2261	RANDOM	63.35

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]
-8.7707			-4.8075		13.5782

RMS Deviations
Key	Refinement Restraint Deviation
t_other_torsion	16.82
t_omega_torsion	3.56
t_angle_deg	1.01
t_bond_d	0.008
t_dihedral_angle_d
t_gen_planes
t_it
t_chiral_improper_torsion
t_sum_occupancies
t_ideal_dist_contact

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4861
Nucleic Acid Atoms
Solvent Atoms	325
Heterogen Atoms	14

Software

Software
Software Name	Purpose
BUSTER	refinement
PHENIX	data processing
O	model building
XDS	data reduction
XDS	data scaling
PHASER	phasing

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 R01GM157729.