2P4A

X-ray structure of a camelid affinity matured single-domain vhh antibody fragment in complex with RNASE A

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION	5.5	295	HAMPTON RESEARCH INDEX SCREEN, SOLUTION #67, pH 5.5, VAPOR DIFFUSION, temperature 295K

Crystal Properties
Matthews coefficient	Solvent content
2.98	58.68

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 70.027	α = 90
b = 131.623	β = 90
c = 137.156	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	100	CCD	MARMOSAIC 300 mm CCD		2006-04-17	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	APS BEAMLINE 23-ID-D	1.0	APS	23-ID-D

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	1.9	20	99.1		7.1	48836	48836

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Number Reflections (All)	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	PDB entry 2P49	1.9	20	48836	46352	2484	97.96	0.18587	0.18587	0.18417	0.21807	RANDOM	27.164

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]
2.25			-1.55		-0.71

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	32.252
r_dihedral_angle_4_deg	12.246
r_dihedral_angle_3_deg	11.704
r_dihedral_angle_1_deg	5.939
r_scangle_it	2.103
r_scbond_it	1.511
r_angle_refined_deg	1.335
r_mcangle_it	0.917
r_mcbond_it	0.812
r_angle_other_deg	0.735
r_symmetry_hbond_refined	0.257
r_nbd_refined	0.194
r_nbd_other	0.192
r_symmetry_vdw_other	0.184
r_symmetry_vdw_refined	0.152
r_mcbond_other	0.132
r_xyhbond_nbd_refined	0.121
r_nbtor_other	0.081
r_chiral_restr	0.06
r_bond_refined_d	0.008
r_gen_planes_refined	0.004
r_bond_other_d	0.001
r_gen_planes_other	0.001
r_nbtor_refined
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3704
Nucleic Acid Atoms
Solvent Atoms	361
Heterogen Atoms	10

Software

Software
Software Name	Purpose
REFMAC	refinement
HKL-3000	data collection
HKL-3000	data reduction
HKL-3000	data scaling
MOLREP	phasing