REL PDBe PDBe PDBe 2008-03-17 2008-03-18 2009-03-31 2012-10-24 Jaalinoja HT Roine E Laurinmaki P Kivela HM Bamford DH Butcher SJ archaea, virus, SH1, spike, infection, adsorption Jaalinoja HT Roine E Laurinmaki P Kivela HM Bamford DH Butcher SJ PROC.NAT.ACAD.SCI.USA 105 8008 8013 2008 18515426 doi:10.1073/pnas.0801758105 SH1 virus, reconstruction of the non-icosahedrally symmetric spikes on the vertices SH1 virus, reconstruction of the non-icosahedrally symmetric spikes on the vertices 1 Haloarcula phage SH1 Haloarcula phage SH1 Haloarcula hispanica ARCHAEA VIRION STRAIN false false SH1 singleParticle particle 7.2

150-500 mM NaCl, 10mM MgCl2, 10 M MgSO4, 5 mM KCl, 3 mM CaCl2, 40 mM Tris-HCl pH 7.2

400 mesh copper grid, Quantifoil R2/2 holey

ETHANE 90 HOMEMADE PLUNGER

Vitrification instrument: EMBL design

A small vial of ethane is placed inside a larger liquid nitrogen reservoir. The grid holding 3 microliters of the sample is held in place at the bottom of a plunger by the means of fine tweezers. When the liquid ethane is ready, a piece of filter paper is then pressed against the sample to blot off excess buffer, sufficient to leave a thin layer on the grid. 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 in liquid nitrogen for later use in the microscope. FEI TECNAI F20 FLOOD BEAM BRIGHT FIELD FIELD EMISSION GUN 200 2.0 0.7 2.5 50000.0 49300.0 GATAN LIQUID NITROGEN 90 94 93

Low dose conditions.

KODAK SO-163 FILM ZEISS SCAI 7 169 Side entry liquid nitrogen-cooled cryo specimen holder

Each micrograph

C2 OTHER 34.0 FSC 0.5 CUT-OFF IMAGIC, EMAN, BSoft

Vertex reconstruction.

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