PROTEINSYNTHESE DES WILDTYPES UND DER LETALMUTANTE 



745 



SUMMARY 



For the analysis of protein synthesis in the wild type and in the lethal mutant 

 I (3) tr of Drosophila melanogaster a cell-free System was worked out which con- 

 ■isted of only fractions from larvae of the two génotypes. In gênerai the 1(3 )tr- 

 ystem showed a lower labelling and incorporated amino acids into proteins of 

 pwer molecular weights than the corresponding +/— -System. The exchange of 

 ndividual fractions between thèse two Systems indicates that mRNA with a 

 edimentation coefficient of 5 — 18 S alone is responsible for the différent protein 

 ptterns. The présent results are discussed in connection with the lethality of the 

 .nutational effect. 



LITERATUR 



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