Nucleic Acids Research, 1977, Vol. 4, No. 12 4313-4322
© 1977
Articles |
Genetically determined differences in concentrations of isosccepting tRNAs in Escherichia coli
Max-Planck-Institut für experimentelle Medizin, Abteilung Molekulare Biologie Hermann-Rein-Str. 3, D-3400 Göttingen, GFR
Received September 16, 1977. Two examples of genetically determined altered concentrations of isoaccep-ting tRNAs are presented:
The concentrations of isoaccepting tRNAsThr are selectively changed by a mutation causing a fourfold overproduction of the cognate aminoacyl-tRNA-syn-thetase, the threonyl-tRNA synthetase, whereas the distribution of isoaccepting tRNAs of four control tRNA-species in these E. coli mitants was not affected by that mutation.
Secondly evidence is presented for a correlation between mutations in structural genes of aminoacid biosynthetic enzymes and alterations in concentrations of cognate isoaccepting tRNAs in two different E. coli strains, auxotrophic for threonine, isoleucine/valine and leucine, and arginine, respectively.