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Codon discrimination and anticodon structural context.

F Lustig1, T Borén, Y S Guindy

  • 1Department of Medical Biochemistry, University of Göteborg, Sweden.

Proceedings of the National Academy of Sciences of the United States of America
|September 1, 1989
PubMed
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Altering a transfer RNA (tRNA) gene changed how it reads genetic code. The same anticodon sequence showed different reading efficiencies depending on the tRNA

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Transfer RNA (tRNA) molecules are crucial for protein synthesis, translating genetic code from messenger RNA (mRNA) into amino acid sequences.
  • The wobble hypothesis describes how the third position of a codon can pair with a non-standard base in the tRNA anticodon, allowing one tRNA to recognize multiple codons.
  • Variations in tRNA structure can influence codon recognition and the fidelity of translation.

Purpose of the Study:

  • To investigate the impact of altering the wobble position nucleotide in tRNA(1)Gly (CCC) to U on its codon recognition capabilities.
  • To compare the translational efficiency and wobble behavior of a mutated tRNA(1)Gly (UCC) with a naturally occurring mycoplasma tRNA(Gly) (UCC).
  • To determine if the structural context of a tRNA molecule affects the 'wobble' function of its anticodon.

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Main Methods:

  • Site-directed mutagenesis was employed to change the cytosine (C) at the wobble position of tRNA(1)Gly (CCC) to uracil (U), creating tRNA(1)Gly (UCC).
  • An in vitro protein-synthesizing system was used to test the codon-reading ability of the mutated tRNA.
  • Phage MS2-RNA, modified via site-directed mutagenesis, served as the mRNA template to specifically monitor the reading of all four glycine codons (GGA, GGU, GGC, GGG).

Main Results:

  • The mutated tRNA(1)Gly (UCC) showed comparable efficiency to mycoplasma tRNA(Gly) (UCC) in reading the GGA codon.
  • Mycoplasma tRNA(1)Gly (UCC) was significantly more efficient than tRNA(1)Gly (UCC) in reading the GGU and GGC codons.
  • While tRNA(1)Gly (UCC) adhered to wobble rules for GGU/GGC, mycoplasma tRNA(1)Gly (UCC) read these codons without discrimination, violating standard wobble restrictions.
  • The anticodon UCC in tRNA(1)Gly was less efficient at reading the GGG codon compared to its presence in mycoplasma tRNA(1)Gly.

Conclusions:

  • The anticodon UCC can function as an efficient 'wobbler' within the structural context of tRNA(1)Gly.
  • In the molecular environment of mycoplasma tRNA(1)Gly, the same anticodon UCC exhibits restricted wobble capabilities.
  • These findings highlight that the tRNA's structural context, not just the anticodon sequence, dictates the extent and fidelity of codon recognition through wobble pairing.