抄録
Activation of sixteen acetylamino acids by rat liver pH 5 enzyme fraction was studied. When the assay was made by pyrophosphate-ATP exchange reaction, only acetylmethionine and acetylleucine were apparently active. However no incorporation of radioactivity of acetyl-C14-L-methionine into s-RNA could be observed, and radioactive acetate was identified from the reaction mixture, indicating the presence of an acetylase in the crude enzyme preparation. Thus the conclusion that acetyl-amino acids examined could not be activated by the rat liver enzyme, was presented.
The authors are grateful to Dr. H. Asoka for his help in part in the presnt studies. The present work has been aided in part by a grant from the Ministry of Education for which the authors are grateful.
