2PCU

Human carboxypeptidase A4 in complex with a cleaved hexapeptide.

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	2BO9

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, SITTING DROP	7.5	277	Crystals were obtained from sitting drops subjected to vapor diffusion and containing consisting of 100nL of hCPA4:hexapeptide (15 mg/mL in 5mM Tris HCl pH 7.5) and 100nL of reservoir solution (0.2M potassium thiocyanate / 20% PEG 3350). Crystallisation drops were dispensed on 96x3-well Greiner plates by a Tecan robot and a Cartesian nanodrop robot (Genomic Solutions) at the joint IBMB-CSIC/Barcelona Science Park Automated Crystallization Platform (PAC). Crystals appeared after incubation for 10-15 days in a Bruker steady-temperature crystal farm at 4 C., VAPOR DIFFUSION, SITTING DROP, temperature 277K

Crystal Properties
Matthews coefficient	Solvent content
2.13	42.32

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 50.304	α = 90
b = 72.494	β = 90
c = 81.575	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	110	CCD	ADSC QUANTUM 210		2006-01-01	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID29	1.036	ESRF	ID29

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	1.6	72.548	98.7	0.093	0.093	4.1	6.1		39536

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	1.6	1.69	95.1		0.346	0.346	2	3.2	5427

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	2BO9	1.6	50	39536	39478	609	98.48	0.159	0.159	0.159	0.176	RANDOM	25.621

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]
-0.94			-1.29		2.23

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	29.517
r_dihedral_angle_4_deg	15.219
r_dihedral_angle_3_deg	12.45
r_dihedral_angle_1_deg	5.995
r_scangle_it	4.138
r_scbond_it	2.669
r_mcangle_it	1.707
r_angle_refined_deg	1.626
r_mcbond_it	1.094
r_symmetry_vdw_refined	0.345
r_nbtor_refined	0.321
r_nbd_refined	0.221
r_xyhbond_nbd_refined	0.155
r_symmetry_hbond_refined	0.127
r_chiral_restr	0.12
r_bond_refined_d	0.017
r_gen_planes_refined	0.009

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2461
Nucleic Acid Atoms
Solvent Atoms	267
Heterogen Atoms	33

Software

Software
Software Name	Purpose
SCALA	data scaling
REFMAC	refinement
PDB_EXTRACT	data extraction
ProDC	data collection
MOSFLM	data reduction
CCP4	data scaling
AMoRE	phasing