Electron microscopy study of Q beta replicase.
Purified preparations of Q beta replicase have been studied by electron microscopy using a negative staining technique, and a three-dimensional model of the enzyme molecule has been constructed. The molecule of this four-subunit protein appears to be a compact structure having a size of 100 +/- 10 A; it is subdivided into two unequal bipartite subparticles. The conclusion has been made that all the constituent subunits, including the ribosomal protein Sl, acquire a globular conformation when associated in the replicase complex.
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