8YVO

Crystal structure of the C. difficile toxin A CROPs domain fragment 2639-2707 bound to C4.2 nanobody

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
in silico model	AlphaFold

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP		288	0.4M Potassium sodium tartrate tetrahydrate

Crystal Properties
Matthews coefficient	Solvent content
4.13	70.23

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 113.804	α = 90
b = 42.85	β = 94.11
c = 178.277	γ = 90

Symmetry
Space Group	I 1 2 1

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	100	PIXEL	RIGAKU HyPix-6000HE		2023-10-17	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SEALED TUBE	RIGAKU PhotonJet-S	1.54184

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	Rpim 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	2.1	20.42	98.6	0.145	0.167	0.082	0.984	8.4	4		50005

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Rrim I (All)	Rpim I (All)	CC (Half)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.1	2.16		96.4	0.812	0.929	0.446	0.609		4.1

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 (Observed)	R-Work	R-Free	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	2.1	20.42	47501	2501	79.94	0.21128	0.20986	0.23839	RANDOM	28.912

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]
2.95		-0.7	7.21		-10.16

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_3_deg	14.69
r_dihedral_angle_2_deg	9.122
r_dihedral_angle_1_deg	8.074
r_long_range_B_refined	6.281
r_long_range_B_other	6.176
r_scangle_other	4.486
r_mcangle_it	3.994
r_mcangle_other	3.994
r_scbond_it	3.186
r_scbond_other	3.185
r_mcbond_it	2.82
r_mcbond_other	2.819
r_angle_refined_deg	2.001
r_angle_other_deg	0.788
r_chiral_restr	0.101
r_bond_refined_d	0.012
r_gen_planes_refined	0.011
r_bond_other_d	0.003
r_gen_planes_other	0.002
r_dihedral_angle_4_deg
r_nbd_refined
r_nbd_other
r_nbtor_refined
r_nbtor_other
r_xyhbond_nbd_refined
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_refined
r_symmetry_vdw_other
r_symmetry_hbond_refined
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_scangle_it
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3012
Nucleic Acid Atoms
Solvent Atoms	350
Heterogen Atoms	32

Software

Software
Software Name	Purpose
REFMAC	refinement
CrysalisPro	data reduction
Aimless	data scaling
MOLREP	phasing