Experiment: 3QUM

Crystal structure of human prostate specific antigen (PSA) in Fab sandwich with a high affinity and a PCa selective antibody

X-RAY DIFFRACTION

Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	2ZCH	PDB entry 2ZCH, using individual PSA and Fab as independent search models.

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	6.5	295	Protein solution: 20 ul 5D3D11 at 10.7 mg/ml and 10 ul PSA at 5 mg/ml + 31 ul 5D5A5 at 6.7mg/ml in PBS. against a precipitant of 10% PEG 4,000, 20% ethylene glycol, 100 mM Na,K phosphate. Drops consisted of 1 ul protein + precipitant equilibrated by vapor diffusion. Streak seeding and macro seeding were used, pH 6.5, VAPOR DIFFUSION, SITTING DROP, temperature 295K

Crystal Properties
Matthews coefficient	Solvent content
3.04	59.54

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 55.308	α = 90
b = 226.883	β = 96.51
c = 118.694	γ = 90

Symmetry
Space Group	P 1 21 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	CCD	MARMOSAIC 225 mm CCD	Pt coated mirrors in a Kirkpatrick-Baez (KB) geometry	2007-03-17	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID23-2	0.872600	ESRF	ID23-2

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (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	3.2	81.65	99.6	0.145	0.145	8.4	2.5	47764	47573		-3	83.924

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	3.2	3.37	98.8		0.791	0.59	1.7	2.4	6864

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (I)	Cut-off Sigma (F)	Number Reflections (All)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Factor (Observed)	R-Work (Depositor)	R-Work (DCC)	R-Free (Depositor)	R-Free (DCC)	R-Free Selection Details	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	THROUGHOUT	PDB entry 2ZCH, using individual PSA and Fab as independent search models.	3.2	58.965	-3	1.36	47764	46916	2367	98.18	0.2032	0.1984	0.2033	0.2937	0.2936	RANDOM	73.269

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]
2.2654		-1.5974	-2.5605		0.2951

RMS Deviations
Key	Refinement Restraint Deviation
f_dihedral_angle_d	22.408
f_angle_d	1.623
f_chiral_restr	0.108
f_bond_d	0.011
f_plane_restr	0.008

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	17078
Nucleic Acid Atoms
Solvent Atoms	91
Heterogen Atoms	437

Software

Software
Software Name	Purpose
ProDC	data collection
MOLREP	phasing
PHENIX	refinement
MOSFLM	data reduction
SCALA	data scaling