Netrin-1 without C-terminal domain forms monomers, dimers, and higher order oligomers in solution, as evidenced by dynamic light scattering (DLS), size exclusion chromatography (SEC), and small angle X-ray scattering (SAXS). In the presence of glycine and high concentrations of sodium chloride, the dimeric form can be stabilized. The asymmetric unit contains one monomer. A dimer that resembles the shape model obtained from SAXS can be obtained by applying the following crystallographic symmetry operation: x-y, -y, -z+1/3.
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Components
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Protein , 1 types, 1 molecules A
#1: Protein
Netrin-1
Mass: 48994.285 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Mus musculus (house mouse) / Gene: Ntn1 / Plasmid: pCEP-Pu / Cell line (production host): HEK293 / Organ (production host): KIDNEY / Production host: Homo sapiens (human) / References: UniProt: O09118
Mass: 18.015 Da / Num. of mol.: 97 / Source method: isolated from a natural source / Formula: H2O
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Details
Has protein modification
Y
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Experimental details
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Experiment
Experiment
Method: X-RAY DIFFRACTION / Number of used crystals: 2
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Sample preparation
Crystal
Density Matthews: 4.8 Å3/Da / Density % sol: 74.37 %
Crystal grow
Temperature: 293 K / Method: vapor diffusion, hanging drop / pH: 7.7 Details: 0.1 M HEPES, 2.7-2.8 M NaCl, 0.02-0.2 M glycine, pH 7.7, VAPOR DIFFUSION, HANGING DROP, temperature 293K
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Data collection
Diffraction
ID
Mean temperature (K)
Crystal-ID
1
100
1
2
100
1
Diffraction source
Source
Site
Beamline
ID
Wavelength (Å)
SYNCHROTRON
CLSI
08B1-1
1
1.2544
SYNCHROTRON
SLS
X06SA
2
1.25470, 1.25520, 1.24210
Detector
Type
ID
Detector
Date
Details
RAYONIX MX-300
1
CCD
Oct 14, 2011
verticalcollimatingmirror, toroidalfocusingmirror
RAYONIX MX-225
2
CCD
Oct 12, 2005
dynamicallybendablemirror
Radiation
ID
Monochromator
Protocol
Monochromatic (M) / Laue (L)
Scattering type
Wavelength-ID
1
double crystal monochromator (DCM) with water-cooled first crystal
Resolution: 2.5→50 Å / Num. all: 27279 / Num. obs: 27279 / % possible obs: 80.9 % / Redundancy: 10.5 % / Biso Wilson estimate: 60.1 Å2 / Rmerge(I) obs: 0.129 / Net I/σ(I): 8.8
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Processing
Software
Name
Version
Classification
HKL-2000
datacollection
SHARP
phasing
REFMAC
5.8.0049
refinement
HKL-2000
datareduction
SCALEPACK
datascaling
Refinement
Method to determine structure: SIRAS / Resolution: 2.64→50 Å / Cor.coef. Fo:Fc: 0.926 / Cor.coef. Fo:Fc free: 0.862 / SU B: 29.397 / SU ML: 0.267 / SU R Cruickshank DPI: 0.359 / Cross valid method: THROUGHOUT / ESU R: 0.362 / ESU R Free: 0.299 / Stereochemistry target values: MAXIMUM LIKELIHOOD Details: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS. The diffraction pattern of Netrin-1 crystals shows strong anisotropy. The resolution limits in direction a*/b* are 44.85 - 2.80 A and in ...Details: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS. The diffraction pattern of Netrin-1 crystals shows strong anisotropy. The resolution limits in direction a*/b* are 44.85 - 2.80 A and in direction c* 44.85 - 2.64 A. Completeness of the dataset in the resolution range of INF - 2.80 A is 0.999, in the range of INF - 2.64 A it is 0.896. The Wilson B-factor calculated from the linear range of the data is 68.0 A**2. The ellipsoidal outer shell in the range of 2.90 - 2.80 A (a*/b*) and 2.74 - 2.64 A (c*) contains 2564 reflections, has a completeness of 1.0, a redundancy of 10.8, I/sigmaI of 2.0, Rmeas of 1.344, Rmerge of 1.280 and Rpim of 0.406. For refinement, an ellipsoidal trunction (limit of 2.80 A in a*/b*, limit of 2.50 A in c*), anisotropic scaling and a negative isotropic B-factor correction of 50% of the B-factor in direction of the lowest fall-off (c*) was applied according to the procedure described by M. Strong, M.R. Sawaya, S. Wang, M. Phillips, D. Cascio, D. Eisenberg, Proc Natl Acad Sci USA. 103, 8060-8-65, 2006. After above anisotropy correction and conversion to amplitudes, the completeness of the refinement dataset is as follows: INF - 2.80 A: 0.996, INF - 2.50 A: 0.807. The Wilson B-factor calculated from the linear range of data is 60.1 A**2.
Rfactor
Num. reflection
% reflection
Selection details
Rfree
0.288
1308
5.1 %
RANDOM
Rwork
0.23
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obs
0.233
24458
89.45 %
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Solvent computation
Ion probe radii: 0.8 Å / Shrinkage radii: 0.8 Å / VDW probe radii: 1.2 Å / Solvent model: MASK