2H7W

Crystal structure of Chagasin, the endogenous cysteine-protease inhibitor from Trypanosoma cruzi

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.5	291	protein: 15 mg/ml in 10 mM tris-Hcl, pH 7.4, 0.1 M sodium chloride. reservoir: 15% PEG 8000, 0.1M ammonium sulphate, 0.1M cacodylate, pH 6.5, VAPOR DIFFUSION, HANGING DROP, temperature 291.0K

Crystal Properties
Matthews coefficient	Solvent content
2.18	43.48

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 48.779	α = 90
b = 48.779	β = 90
c = 183.602	γ = 120

Symmetry
Space Group	P 31 1 2

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	MAR CCD 165 mm		2006-03-17	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	LNLS BEAMLINE D03B-MX1	1.427	LNLS	D03B-MX1

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	1.7	24.175	99.9	0.072	22.5	9.7		28099			26.29

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)
	1.7	1.79	100		0.405	4.7	10.9

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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	SIRAS	THROUGHOUT	1.7	24.175	28099	26684	1414	99.85	0.20706	0.20706	0.20539	0.23776	RANDOM	23.814

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]
0.55	0.27		0.55		-0.82

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	36.2
r_dihedral_angle_3_deg	15.142
r_dihedral_angle_4_deg	8.553
r_dihedral_angle_1_deg	6.223
r_scangle_it	3.095
r_scbond_it	2.015
r_angle_refined_deg	1.468
r_mcangle_it	1.326
r_mcbond_it	0.807
r_nbtor_refined	0.32
r_nbd_refined	0.213
r_symmetry_vdw_refined	0.207
r_xyhbond_nbd_refined	0.159
r_symmetry_hbond_refined	0.14
r_chiral_restr	0.076
r_bond_refined_d	0.012
r_gen_planes_refined	0.006
r_bond_other_d
r_angle_other_deg
r_gen_planes_other
r_nbd_other
r_nbtor_other
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_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	1647
Nucleic Acid Atoms
Solvent Atoms	190
Heterogen Atoms

Software

Software
Software Name	Purpose
REFMAC	refinement
MAR345	data collection
MOSFLM	data reduction
CCP4	data scaling
SHARP	phasing