Abstract
Polyribosomes from rabbit reticulocytes have been studied in the electron microscope using positive- and negative-staining techniques. They can be seen as extended arrays of ribosomes connected by a strand approximately 10 A in width. The most frequent structure contains five ribosomes, although some larger units have six or even seven. The distance between ribosomal centers has been measured for different types of preparations. Some of these are tightly clustered with the ribosomes almost in contact, while other preparations have ribosomes separated by a gap of 100 to 150 A. This variability is probably associated with differences in sample preparation. The relation between the length of the polyribosome and the length of the messenger RNA for hemoglobin is discussed. Some evidence concerning the sub-structure of ribosomes is also presented.
Published Version
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