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Progress toward a reduced phage genetic code.

Anzhi Yao1, Sean A Reed1, Minseob Koh1

  • 1The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, United States.

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|April 4, 2018
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Summary
This summary is machine-generated.

Researchers explored removing methionine (Met) from the M13 phage proteome, successfully replacing all 24 elongation Met sites with other amino acids. However, reducing phage viability remains a challenge for complete methionine elimination.

Keywords:
Amino acid alphabet reductionBacteriophage M13DNA libraryMethionine substitution

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Synthetic Biology

Background:

  • All known life utilizes at least 20 canonical amino acids.
  • Reducing the number of amino acids in biological systems has proven difficult.
  • Methionine (Met) is an essential amino acid in protein synthesis.

Purpose of the Study:

  • To investigate the feasibility of removing methionine from a biological system.
  • To explore the genetic code minimization by eliminating methionine in filamentous phage.
  • To identify challenges associated with methionine removal in a model organism.

Main Methods:

  • Utilized filamentous phage (M13) as a model system.
  • Systematically replaced all 24 elongation methionine sites in the M13 phage genome.
  • Introduced compensatory mutations where necessary for amino acid substitutions.
  • Assessed the viability and infectivity of mutant phages.

Main Results:

  • Successfully replaced all 24 elongation methionine sites with other canonical amino acids, primarily leucine.
  • Observed reduced viability and infectivity in phages with multiple methionine substitutions.
  • Achieved simultaneous deletion of 15 out of 24 elongation methionines in the M13 proteome.

Conclusions:

  • It is feasible to replace all elongation methionines in the M13 phage proteome with other amino acids.
  • Maintaining phage viability is a significant hurdle in complete methionine elimination.
  • This study provides a foundation for future efforts in genetic code minimization.