THE INCORPORATION OF LEUCINE-C 14 INTO PROTEIN BY A CELL-FREE PREPARATION FROM MAIZE KERNELS

Abstract
A system from developing maize endosperm consisting of washed particles plus a pH 5.2 fraction from the supernatant that actively incorporates leucine-Cl4 into protein is described. The system requires a source of energy and GTP. The incorporation is inhibited by treatment with ribonuclease or chlor-amphenicol. When operating optimally, the incorporation efficiency is 1 to 2% of the added isotope, making this system comparable to the mammalian systems.