1W2M

Ca-substituted form of E. coli aminopeptidase P

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		8.2		25% PEG 4K, 0.1 MM EDTA, 0.1 M TRIS (PH 8.2), 0.2 M NA ACETATE CRYSTALS SOAKED IN 30% ISOPROPANOL PLUS 5 MM CACL2 FOR 10 MIN PRIOR TO FREEZING

Crystal Properties
Matthews coefficient	Solvent content
4.4	71.7

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 208.359	α = 90
b = 312.688	β = 90
c = 160.198	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	113	IMAGE PLATE	RIGAKU RAXIS IIC	YALE MIRRORS	1999-06-17	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	RIGAKU RU200 H

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge 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	2.4	30	94.5	0.04	19.6	2.1		192310		-3	40.59

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R Merge I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.4	2.48	86		0.16	4.5	1.6

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	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	PDB ENTRY 1M35	2.4	182.57	182590	9688	94.8	0.176	0.175	0.2	RANDOM	26.12

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]
-0.58			-0.67		1.25

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_1_deg	5.867
r_scangle_it	3.097
r_scbond_it	1.753
r_angle_refined_deg	1.254
r_mcangle_it	1.077
r_angle_other_deg	0.833
r_mcbond_it	0.529
r_symmetry_vdw_other	0.295
r_nbd_other	0.235
r_nbd_refined	0.2
r_symmetry_vdw_refined	0.176
r_symmetry_hbond_refined	0.156
r_xyhbond_nbd_refined	0.15
r_nbtor_other	0.086
r_chiral_restr	0.073
r_bond_refined_d	0.013
r_gen_planes_refined	0.005
r_bond_other_d	0.002
r_gen_planes_other	0.002
r_dihedral_angle_2_deg
r_dihedral_angle_3_deg
r_dihedral_angle_4_deg
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_mcbond_other
r_mcangle_other
r_scbond_other
r_scangle_other
r_long_range_B_refined
r_long_range_B_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	20931
Nucleic Acid Atoms
Solvent Atoms	1072
Heterogen Atoms	60

Software

Software
Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling