1SQZ

Design of specific inhibitors of Phopholipase A2: Crystal structure of the complex formed between Group II Phopholipase A2 and a designed peptide Dehydro-Ile-Ala-Arg-Ser at 1.2A resolution

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.8	297	0.2M Ammonium sulphate,50% PEG, pH 7.8, VAPOR DIFFUSION, HANGING DROP, temperature 297K

Crystal Properties
Matthews coefficient	Solvent content
2.5	50

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 52.549	α = 90
b = 52.549	β = 90
c = 47.833	γ = 90

Symmetry
Space Group	P 43

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	203	CCD	MARRESEARCH	MIRROR	2003-09-29	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	EMBL/DESY, HAMBURG BEAMLINE X31	0.803	EMBL/DESY, HAMBURG	X31

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	1.2	20	99.5	0.082	17.3	19.4	40325	40325			10.3

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.2	1.24	100		0.09	14

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	1FB2	1.2	17.68	40325	39501	824	100	0.2147	0.20949	0.20934	0.21705	RANDOM	14.267

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]
0.21			0.21		-0.43

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_3_deg	16.249
r_dihedral_angle_1_deg	2.917
r_scangle_it	2.452
r_scbond_it	1.66
r_angle_refined_deg	1.542
r_mcangle_it	1.401
r_angle_other_deg	0.833
r_mcbond_it	0.779
r_nbd_refined	0.409
r_symmetry_vdw_other	0.323
r_symmetry_vdw_refined	0.3
r_symmetry_hbond_refined	0.239
r_nbd_other	0.216
r_xyhbond_nbd_refined	0.163
r_chiral_restr	0.086
r_xyhbond_nbd_other	0.039
r_bond_refined_d	0.011
r_gen_planes_refined	0.007
r_gen_planes_other	0.005
r_bond_other_d	0.002
r_dihedral_angle_2_deg
r_dihedral_angle_4_deg
r_nbtor_refined
r_nbtor_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_hbond_other
r_mcbond_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	984
Nucleic Acid Atoms
Solvent Atoms	270
Heterogen Atoms	15

Software

Software
Software Name	Purpose
REFMAC	refinement
HKL-2000	data reduction
SCALEPACK	data scaling
AMoRE	phasing