2AH2

Trypanosoma cruzi trans-sialidase in complex with 2,3-difluorosialic acid (covalent intermediate)

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	7.5	291	PEG 4000, Tris-HCl, isopropanol, pH 7.5, VAPOR DIFFUSION, HANGING DROP, temperature 291K

Crystal Properties
Matthews coefficient	Solvent content
2.6	51.6

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 54.149	α = 90
b = 128.69	β = 108.74
c = 54.298	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	110	CCD	ADSC QUANTUM 4		2003-04-16	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-1	0.934	ESRF	ID14-1

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	1.6	28.4	89.2	0.042			82813	82813	1	1

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	1.6	1.63	83.8	83.8	0.201

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	FOURIER SYNTHESIS	THROUGHOUT	1.6	28.4	82813	82504	4134	89.27	0.101	0.099	0.099	0.152	RANDOM	14.981

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]
0.83		1.16	-0.5		0.41

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	33.744
r_sphericity_free	26.686
r_dihedral_angle_4_deg	17.281
r_dihedral_angle_3_deg	12.851
r_dihedral_angle_1_deg	7.185
r_sphericity_bonded	6.919
r_scangle_it	5.514
r_scbond_it	4.305
r_mcangle_it	2.657
r_rigid_bond_restr	2.413
r_mcbond_it	2.187
r_angle_refined_deg	1.768
r_angle_other_deg	0.898
r_mcbond_other	0.655
r_symmetry_hbond_refined	0.381
r_symmetry_vdw_other	0.271
r_symmetry_vdw_refined	0.228
r_nbd_refined	0.227
r_xyhbond_nbd_refined	0.207
r_nbd_other	0.201
r_nbtor_refined	0.179
r_chiral_restr	0.119
r_nbtor_other	0.084
r_bond_refined_d	0.019
r_gen_planes_refined	0.009
r_bond_other_d	0.001
r_gen_planes_other	0.001

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	4849
Nucleic Acid Atoms
Solvent Atoms	850
Heterogen Atoms	44

Software

Software
Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
REFMAC	refinement
PDB_EXTRACT	data extraction
AMoRE	phasing