REL PDBe PDBe PDBe 2007-09-07 2007-09-11 2008-04-07 2012-10-24 Electron cryomicroscopy reveals different F1+F2 protein States in intact parainfluenza virions. Ludwig K Schade B Boettcher C Korte T Ludwig K Schade B Bottcher C Korte T Ohlwein N Baljinnyam B Veit M Herrmann A Electron cryomicroscopy reveals different F1+F2 protein States in intact parainfluenza virions. J.VIROL. 82 3775 3781 2008 18216117 doi:10.1128/JVI.02154-07 F-Protein in intact Parainfluenzavirus 5 F-Protein in intact Parainfluenzavirus 5
sample of fusion active virions (proven by fluorescence spectroscopy)of PIV5 (strain W3A)
F-Protein Homotrimer 1 0.15 F-Protein Parainfluenza virus 5 W3A viral membrane 0.15 Homotrimer false singleParticle particle 7.4
PBS (150 mM NaCl, 5.8 mM NaH2PO4/Na2HPO4)
 NEGATIVE
30 seconds absorption 60 seconds staining (1% phospho-tungstic acid, pH 7.4) vitrified in liquid ethane
200 mesh carbon coated collodium-supported copper grids
 ETHANE HOMEMADE PLUNGER
Vitrification instrument: self-construction
A small vial of ethane is placed inside a larger liquid nitrogen reservoir. The grid holding a few microliters of the sample is held in place at the bottom of a plunger by the means of fine tweezers. Once the ethane in the vial is completely frozen, it needs to be slightly melted. When the liquid ethane is ready, a piece of filter paper is then pressed against the sample to blot of excess buffer, sufficient to leave a thin layer on the grid. After a redetermined time, the filter paper is removed, and the plunger is allowed to drop into the liquid ethane. Once the grid enters the liquid ethane, the sample is rapidly frozen,and the grid is transferred under liquid nitrogen to a storage box immersed liquid nitrogen for later use in the microscope. FEI TECNAI F20 FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 160 2 1.501 2.066 50000.0 51064.0 GATAN LIQUID NITROGEN 92 objective lens astigmatism was corrected at 100,000 times magnification KODAK SO-163 FILM PRIMESCAN 4 175 12 8. Side entry liquid nitrogen-cooled cryo specimen holder
well resolved spike-like proteins protruding from the viral membrane suitable for single particle analysis were interactively selected
MSA-based
 C3 OTHER 15.0 FSC 3 SIGMA CUT-OFF Imagic 5700 emd_1421.map.gz 1 IMAGE STORED AS SIGNED BYTE 110 110 110 -54 -55 -55 110 110 110 171.6 171.6 171.6 90 90 90 X Y Z -128.0 122.0 -124.686999999999998 18.075700000000001 1.56 1.56 1.56 -95.0 EMDB In-situ 3D reconstruction of the ectodomain of the PIV5 F protein determined from cryo-negative stain electron micrographs
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emd_5723.tif