1MWE

THE X-RAY STRUCTURE OF A COMPLEX OF TERN N9 INFLUENZA VIRUS NEURAMINIDASE COMPLEXED WITH SIALIC ACID AT 4 DEGREES C REVEALING A SECOND SIALIC ACID BINDING SITE

X-RAY DIFFRACTION

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Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		5.9		1.9M PHOSPHATE (PH 5.9)

Crystal Properties
Matthews coefficient	Solvent content
2.83	54

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 181.04	α = 90
b = 181.04	β = 90
c = 181.04	γ = 90

Symmetry
Space Group	I 4 3 2

Diffraction

Diffraction Experiment
ID #	Crystal ID	Scattering Type	Data Collection Temperature	Detector	Detector Type	Details	Collection Date	Monochromator	Protocol
1	1	x-ray	106	IMAGE PLATE	RIGAKU RAXIS II	YALE MIRRORS	1997-01-19	M

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	ROTATING ANODE	MACSCIENCE M18X

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	R Merge I (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	100	96.6	0.076	0.085	9.6	5.07		291377		1

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.7	1.8	91.8

Refinement

Statistics
Diffraction ID	Structure Solution Method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (Observed)	Number Reflections (R-Free)	Percent Reflections (Observed)	R-Work	R-Free	Mean Isotropic B
X-RAY DIFFRACTION	MOLECULAR REPLACEMENT	TERN N9 NEURAMINIDASE	1.7	6	1	44274		96.6

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]

RMS Deviations
Key	Refinement Restraint Deviation
x_dihedral_angle_d	25.6
x_scangle_it	3.5
x_mcangle_it	3
x_scbond_it	3
x_mcbond_it	2.5
x_angle_deg	1.9
x_improper_angle_d	1.53
x_bond_d	0.016
x_bond_d_na
x_bond_d_prot
x_angle_d
x_angle_d_na
x_angle_d_prot
x_angle_deg_na
x_angle_deg_prot
x_dihedral_angle_d_na
x_dihedral_angle_d_prot
x_improper_angle_d_na
x_improper_angle_d_prot

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3067
Nucleic Acid Atoms
Solvent Atoms	396
Heterogen Atoms	191

Software

Software
Software Name	Purpose
R-AXIS	data collection
PROTEIN	data reduction
X-PLOR	model building
X-PLOR	refinement
R-AXIS	data reduction
PROTEIN	data scaling
X-PLOR	phasing