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  • Title: [Properties of the cell-free protein synthesizing system from the fibroin region of the Bombyx mori silkgland].
    Author: Kullyev P, Karaev K, Gauze GG.
    Journal: Mol Biol (Mosk); 1976; 10(6):1355-9. PubMed ID: 1053090.
    Abstract:
    Microsomes isolated from the fibroin region of the Bombyx mori silkgland synthesize in the cell-free system a glycin rich polypeptide or polypeptides presumably representing fibroin precursors. Besides microsomes the system requires ATP and ATP-generating system, GTP, soluble protein fraction and tRNA, glycine incorporation is inhibited by puromycin and cycloheximide. It is shown that the synthesis of a polypeptide with high Gly/Lys ratio requires soluble protein fraction isolated from the silk gland at the end of the instar V. When the soluble protein fraction from the larvoe at the early instar V is used the Gly/Lys ratio in the product is markedly lower. These results permit to suggest that fibroin synthesis may be regulated at the level of tRNA aminoacylation.
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