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The small (40 S) subunit from rabbit reticulocyte ribosomes has been reconstructed from electron micrographs of a negatively stained single-particle specimen to a resolution of 3.85 nm. The reconstruction reveals a morphology consisting of a broad wedge-shaped head structure set atop a quasi-cylindrical body. Distinctive features recognized in two-dimensional projections, such as the beak, back lobes, and feet, can now be localized in three dimensions. By reference to a recent reconstruction of the monomeric 80 S ribosome we can identify the interface and exterior surfaces of the subunit, thus enabling more detailed functional interpretations.
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