Studies on the Mechanisms of Gibberellic Acid Action II. Regulation of Protein Biosynthesis and Phosphorylation by $GA_3$ in the Presence of Actinomycin D

Gibberellic Acid의 작용 기작에 관한 연구 II. Actinomycin D 처리시 $GA_3$에 의한 단백질의 생합성 및 인산화반응의 조절

As a part of the studies on the regulatory mechanism of gene expression by gibbrellic acid, the effects of $GA_3$ on the protein biosynthesis and phosphorylation in maize seedlings were investigated in the presence of actinomycin D. The activities of protein biosynthesis and phosphorylation in germinating seeds treated with $GA_3$ were greater than those of the control at the 3-day point after germination. It is assumed that the enhancement of protein biosynthesis by $GA_3$ in the presence of actinomycin D is due to the effects of $GA_3$ on the translational processes in which protein is produced from the mRNA synthesized previously.