Cysteinyl-tRNA deacylation can be uncoupled from protein synthesis

PLoS One. 2012;7(3):e33072. doi: 10.1371/journal.pone.0033072. Epub 2012 Mar 9.

Abstract

Aminoacyl-tRNA synthetases (ARSs) are critical components of protein translation, providing ribosomes with aminoacyl-tRNAs. In return, ribosomes release uncharged tRNAs as ARS substrates. Here, we show that tRNA deacylation can be uncoupled from protein synthesis in an amino acid specific manner. While tRNAs coupled to radiolabeled Met, Leu Lys, or Ser are stable in cells following translation inhibition with arsenite, radiolabeled Cys is released from tRNA at a high rate. We discuss possible translation independent functions for tRNA(Cys).

Publication types

  • Research Support, N.I.H., Intramural

MeSH terms

  • Acylation
  • Amino Acyl-tRNA Synthetases / metabolism
  • Arsenites / pharmacology
  • Cysteine / metabolism*
  • Electrophoresis, Polyacrylamide Gel
  • HeLa Cells
  • Humans
  • Microscopy, Fluorescence
  • Protein Biosynthesis / drug effects
  • Protein Biosynthesis / physiology*
  • RNA, Transfer, Cys / metabolism*

Substances

  • Arsenites
  • RNA, Transfer, Cys
  • Amino Acyl-tRNA Synthetases
  • Cysteine
  • arsenite