Abstract
Activity and diversity of the tRNA methyltransferases were examined during embryogenesis of the housefly, Musca domestica. A rapid rise in the activity of the tRNA methyltransferases was observed during the first 3 hr of embryogenesis. Activity increased slowly until the tenth hour of embryogenesis and then declined until hatching at 12 hr. The greatest diversity of tRNA methyltransferases, as indicated by extent of methylation, existed at 6 hr of embryogenesis; the least diversity was observed in 1-hr embryos, while 12-hr embryos showed intermediate levels. Inhibition of embryonic tRNA methyltransferases at high concentrations of enzyme was observed in all extracts examined.
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