Abstract
Ribonuclease digestion of 50 S-derived LiCl cores led to 22 ribonucleoprotein particles which were isolated by repeated sucrose gradient centrifugations. The protein content was determined and ranged from 2 to 28 proteins. Most of the fragments showed a unique RNA pattern as judged by acrylamide gel electrophoresis. Functional tests were performed with selected fragments. No fragment was active in the poly(U) or the peptidyl-transferase assay. Chloramphenicol binding studies revealed that in addition to the dominant role of protein L16, the protein L11 (or L6) is involved directly in the drug binding. Finally, tests for ATPase and GTPase activity showed that protein L18 is involved in GTPase activity.
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