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A description of any additional details concerning the sample support.
This grid plus sample was kept at -170 deg C for a month before use
1
A 3-microliter sample of each PDC preparation (~0.35 mg/ml containing
20 microgram/ml bacitracin) was deposited, blotted, and quick-frozen
in liquid ethane on a glow-discharged carbon-coated holey grid.
The vitrified samples were recorded at ~1 micrometer under focus at
~10 e/Angstroms-squared dose for image processing. A second exposure
of ~2-3 micrometer under focus was recorded and used as an aid
in analyzing the images with the focal pair method. The images were
recorded on Kodak SO 163 film at a nominal magnification of x50,000
in a JEOL JEM 1200 electron microscope operated at 100 kV.
2
Orientation of 4300 Ribosome projections identified by 3D projection
matching using low resolution reference. (Penczek et al., 1994).
Reconstruction (SIRT) simultaneously performed CTF correction
(Zhu et al. submitted).
3