Biopolym. Cell. 1985; 1(2):70-79.
Cell Biology
Immunomorphological and biochemical studies on intracellular distribution of tryptophanyl-tRNA synthetase from higher eukaryotes
1Paley E. L., 1Baranov V. N., 2Zinoviev N. E., 1Kisselev L. L.
  1. Institute of Molecular Biology, Academy of Sciences of the USSR
    Moscow, USSR
  2. Institute of Carcinogenesis, All-Union Cancer Research Centre, Academy of Medical Sciences of the USSR
    Moscow, USSR


Intracellular distribution of tryptophanyl-tRNA synthetase (TRS, EC in cultivated bovine kidney cells MDBK was studied using purified monospecific polyclonal as well as monoclonal antibodies against cytoplasmic enzyme. Both light and electron microscopy was used to visualize the localization of antigen-antibody complexes within cells. The amount of TRS varied within a wide range in cytoplasm of various cells in the same culture. TRS was established to exist at free polyribosomes and as big aggregates in cytosol, at polysomes attached to membranes of rough endoplasmic reticulum as well as to external nuclear membrane. The product of cytochemical reaction was not revealed in nuclei, mitochondria, Golgi apparatus and in the region of microfilaments. Biochemical studies of isolated mitochondria from bovine tissues and from normal and malignant human tissues by means of immunoblotting and immunoprecipitation showed the presence of TRS in these organelles. Human and bovine cytoplasmic and mitochondrial TRS share common antigenic determinants.


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