6HCX

Influenza Virus N9 Neuraminidase A complex with Zanamivir molecule (Tern).

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1F8E

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1	VAPOR DIFFUSION, HANGING DROP	6.6	293	N9 crystals were grown by hanging-drop vapour diffusion against a reservoir of 1.9M potassium phosphate, pH 6.8, starting with equal volumes of N9 NA (10-15 mg/ml in water) and potassium phosphate buffer 1.4M KH2PO4:3M K2HPO4 in ratio 8:4, pH 6.6 at 20 degrees celsius. Inhibitor complexes obtained by soaking N9 crystals in a solution of 1.4M potassium phosphate buffer, pH 6.8, containing 5mM of inhibitor for 3 hours at 18 degrees celsius. Soaked in glycerol cryo-buffer.

Crystal Properties
Matthews coefficient	Solvent content
2.82	56.42

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 180.935	α = 90
b = 180.935	β = 90
c = 180.935	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	100	CCD	ADSC QUANTUM 315		2001-12-12	M	SINGLE WAVELENGTH

Radiation Source
ID #	Source	Type	Wavelength List	Synchrotron Site	Beamline
1	SYNCHROTRON	SSRL BEAMLINE BL11-1	0.98	SSRL	BL11-1

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (Observed)	Rrim I (All)	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	1.29	42.68	99.9	0.093	16.3	10		122689			12.3

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	Rrim I (All)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	1.3	1.4	99.5		0.706	2.3	6.3

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	1F8E	1.3	42.68	116245	6157	99.87	0.09831	0.09691	0.1246	RANDOM	15.039

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
r_sphericity_free	37.992
r_dihedral_angle_2_deg	32.275
r_dihedral_angle_1_deg	20.182
r_dihedral_angle_4_deg	19.062
r_sphericity_bonded	12.66
r_dihedral_angle_3_deg	11.788
r_rigid_bond_restr	6.455
r_long_range_B_refined	5.515
r_long_range_B_other	5.515
r_scbond_it	5.06
r_scbond_other	5.058
r_scangle_other	4.129
r_angle_refined_deg	1.954
r_mcangle_other	1.485
r_mcangle_it	1.484
r_mcbond_it	1.245
r_mcbond_other	1.237
r_angle_other_deg	1.158
r_chiral_restr	0.123
r_bond_refined_d	0.018
r_gen_planes_refined	0.013
r_bond_other_d	0.002
r_gen_planes_other	0.002
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_scangle_it

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	3067
Nucleic Acid Atoms
Solvent Atoms	691
Heterogen Atoms	205

Software

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