Abstract
A reticulocyte translation system was depleted of functional EF-2 by treatment with diphtheria toxin (DT) fragment A and NAD. After dialysis to remove NAD, the system was reconstituted using preparation of EF-2 derived from pyBHK cells. Untreated and reconstituted lysates permitted similar rates of translation. As expected, when DT-treated EF-2 was used to reconstitute the system, no translation occurred. Furthermore EF-2, reacting with the endogenous ADP-ribosyl transferase from pyBHK cells, was also unable to restore protein synthesis in the reconstituted system. These studies suggest that eukaryotic cellular ADP-ribosyl transferases may play a role in regulating protein synthesis.
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