2XA5

Structure of substrate binding protein SiaP (A11N) in complex with Neu5Ac

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	2V4C	PDB ENTRY 2V4C

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		7	277	30 MG/ML SIAP (IN 20 MM HEPES, 10 MM NACL AND NEU5AC, PH 8.0) AND RESERVOIR SOLUTION (100MM MES PH 6.0, 28.5% PEG 6K, 50MM SODIUM FLUORIDE); 2:1 RATIO RESPECTIVELY; TEMPERATURE 277K

Crystal Properties
Matthews coefficient	Solvent content
2.2	45

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 47.818	α = 90
b = 74.7	β = 90
c = 87.254	γ = 90

Symmetry
Space Group	P 21 21 21

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	ADSC QUANTUM 210		2009-07-27	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	ESRF BEAMLINE ID14-4		ESRF	ID14-4

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	1.09	74	99.4	0.06	13.2	5.5		128703		3.7

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	1.09	1.15	98.9		0.34	3.8	5.1

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 2V4C	1.09	32.229	122059	6500	99.4677	0.11895	0.11762	0.14436	RANDOM	11.082

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]
-0.06			-0.44		0.5

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_2_deg	38.751
r_dihedral_angle_3_deg	13.481
r_dihedral_angle_4_deg	11.455
r_scangle_it	6.217
r_dihedral_angle_1_deg	5.596
r_scbond_it	4.404
r_mcangle_it	3.194
r_mcbond_it	2.149
r_angle_refined_deg	1.933
r_rigid_bond_restr	1.561
r_angle_other_deg	1.286
r_mcbond_other	0.954
r_chiral_restr	0.126
r_bond_refined_d	0.022
r_gen_planes_refined	0.011
r_bond_other_d	0.006
r_gen_planes_other	0.004
r_nbd_refined
r_nbd_other
r_nbtor_refined
r_nbtor_other
r_xyhbond_nbd_refined
r_xyhbond_nbd_other
r_metal_ion_refined
r_metal_ion_other
r_symmetry_vdw_refined
r_symmetry_vdw_other
r_symmetry_hbond_refined
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_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	2442
Nucleic Acid Atoms
Solvent Atoms	584
Heterogen Atoms	21

Software

Software
Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALEPACK	data scaling
REFMAC	phasing