2CEX

Structure of a sialic acid binding protein (SiaP) in the presence of the sialic acid acid analogue Neu5Ac2en

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		8.5		5 MM NEU5AC2EN, 5 MM ZINC ACETATE,0.1 M TRIS-HCL PH 8.5, 0.2 M MAGNESIUM CHLORIDE, 25 % PEG 3350

Crystal Properties
Matthews coefficient	Solvent content
2.32	46.5

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 131.448	α = 90
b = 88.701	β = 105.33
c = 115.912	γ = 90

Symmetry
Space Group	C 1 2 1

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	MARRESEARCH		2005-06-26	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE BM14		ESRF	BM14

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	2.2	50	75.7	0.1	10.7	3.2		49350		3

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	2.2	2.28	12.7		0.56	1.1	1.3

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	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	2.2	111.8	46872	2500	75.6	0.201	0.197	0.28	RANDOM	30.03

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]
0.12		0.1	0.32		-0.39

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	39.814
r_dihedral_angle_3_deg	18.282
r_dihedral_angle_4_deg	11.805
r_dihedral_angle_1_deg	7.37
r_scangle_it	2.492
r_angle_refined_deg	1.727
r_scbond_it	1.678
r_mcangle_it	0.997
r_angle_other_deg	0.985
r_mcbond_it	0.629
r_symmetry_vdw_other	0.222
r_nbd_refined	0.198
r_xyhbond_nbd_refined	0.194
r_nbd_other	0.182
r_nbtor_refined	0.177
r_symmetry_hbond_refined	0.168
r_metal_ion_refined	0.164
r_symmetry_vdw_refined	0.153
r_mcbond_other	0.143
r_chiral_restr	0.11
r_nbtor_other	0.093
r_bond_refined_d	0.018
r_xyhbond_nbd_other	0.015
r_gen_planes_refined	0.006
r_bond_other_d	0.001
r_gen_planes_other	0.001
r_metal_ion_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_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	9515
Nucleic Acid Atoms
Solvent Atoms	455
Heterogen Atoms	44

Software

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