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Cell-free protein synthesis by kidney from the aging female Fischer F344 RAT

Biochimica et Biophysica Acta (BBA) - Nucleic Acids and Protein Synthesis, ISSN: 0005-2787, Vol: 652, Issue: 1, Page: 204-217
1981
  • 27
    Citations
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  • 2
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    27
    • Citation Indexes
      27
  • Captures
    2

Article Description

This is the first report to describe and characterize a cell-free protein synthesis system derived from kidney tissue. The optimum conditions for [ 3 H]valine incorporation into protein by the post-mitochondrial supernatant from whole kidneys were found to be: pH 6.9, 7.5 mM MgCl 2, 150 mM KCl, 10 mM ATP, and 2 mM GTP. The cell-free protein-synthetising activities of kidneys isolated from 4.5-, 7.5-, 22-, and 31-month-old female Fischer F344 rats were measured using the post-mitochondrial supernatant. A 73–87% decrease in cell-free protein synthesis was observed between 4.5 and 31 months of age. Both the cell sap and microsomal fractions of the kidney post-mitochondrial super-natant from old rats were less active in protein synthesis than these fractions from the kidneys of young rats. No age-related change in the activity of RNA-ase in the kidney post-mitochondrial supernatant was observed. Kidney ribosomes stripped of endogenous mRNA were found to be active in poly(uridylic acid)-directed polyphenylalanine synthesis. The effect of aging on the fidelity of translation was determined by measuring poly(uridylic acid)-directed [ 14 C]-phenylalanine and [ 3 H]leucine incorporation by kidney ribosomes isolated from rats of various ages. No age-related change in the fidelity of poly(uridylic acid) translation by kidney ribosomes was observed.

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