2AEP

An epidemiologically significant epitope of a 1998 influenza virus neuraminidase forms a highly hydrated interface in the NA-antibody complex.

X-RAY DIFFRACTION

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Starting Model(s)

Initial Refinement Model(s)
Type	Source	Accession Code	Details
experimental model	PDB	1NN2	1NN2, 1NCA
experimental model	PDB	1NCA	1NN2, 1NCA

Crystallization

Crystalization Experiments
ID	Method	pH	Temperature	Details
1		7.5		2M AMMONIUM SULFATE, 100 mM TRIS, pH 7.5

Crystal Properties
Matthews coefficient	Solvent content
3.2	61.4

Crystal Data

Unit Cell
Length ( Å )	Angle ( ˚ )
a = 155.057	α = 90
b = 155.057	β = 90
c = 102.645	γ = 90

Symmetry
Space Group	P 4 21 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	IMAGE PLATE	RIGAKU RAXIS IV	Osmic	2003-06-11	M	SINGLE WAVELENGTH

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

Data Collection

Overall
ID #	Resolution (High)	Resolution (Low)	Percent Possible (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	2.1	20	99.98	0.104	17.64	6.25		73146

Highest Resolution Shell
ID #	Resolution (High)	Resolution (Low)	Percent Possible (All)	Percent Possible (Observed)	R-Sym I (Observed)	Mean I Over Sigma (Observed)	Redundancy	Number Unique Reflections (All)
1	2.1	2.17	100		0.321	2.06	5.5

Refinement

Statistics
Diffraction ID	Structure Solution Method	Cross Validation method	Starting model	Resolution (High)	Resolution (Low)	Cut-off Sigma (F)	Number Reflections (All)	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	1NN2, 1NCA	2.1	20	1	73178	69450	3686	100	0.19	0.188	0.224	RANDOM	32.91

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]
-0.9			-0.9		1.79

RMS Deviations
Key	Refinement Restraint Deviation
r_dihedral_angle_1_deg	7.588
r_scangle_it	4.642
r_scbond_it	2.996
r_angle_refined_deg	1.986
r_mcangle_it	1.933
r_mcbond_it	1.111
r_angle_other_deg	0.972
r_symmetry_vdw_other	0.294
r_nbd_other	0.263
r_nbd_refined	0.201
r_symmetry_hbond_refined	0.168
r_xyhbond_nbd_refined	0.167
r_symmetry_vdw_refined	0.134
r_chiral_restr	0.127
r_metal_ion_refined	0.122
r_nbtor_other	0.093
r_bond_refined_d	0.025
r_gen_planes_refined	0.011
r_gen_planes_other	0.007
r_bond_other_d	0.003
r_dihedral_angle_2_deg
r_dihedral_angle_3_deg
r_dihedral_angle_4_deg
r_nbtor_refined
r_xyhbond_nbd_other
r_metal_ion_other
r_symmetry_hbond_other
r_symmetry_metal_ion_refined
r_symmetry_metal_ion_other
r_mcbond_other
r_rigid_bond_restr
r_sphericity_free
r_sphericity_bonded

Non-Hydrogen Atoms Used in Refinement
Non-Hydrogen Atoms	Number
Protein Atoms	5125
Nucleic Acid Atoms
Solvent Atoms	506
Heterogen Atoms	180

Software

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