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Mirror-Image 5S Ribonucleoprotein Complexes.

Jun-Jie Ling1, Chuyao Fan1, Hong Qin1

  • 1School of Life Sciences, Tsinghua-Peking Center for Life Sciences, Beijing Frontier Research Center for Biological Structure, Center for Synthetic and Systems Biology, Ministry of Education Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, Ministry of Education Key Laboratory of Bioinformatics, Tsinghua University, Beijing, 100084, China.

Angewandte Chemie (International Ed. in English)
|December 17, 2019
PubMed
Summary
This summary is machine-generated.

Scientists synthesized mirror-image ribosomal proteins and 5S ribosomal RNA, assembling them into chiral-specific ribonucleoprotein complexes. This is a key step toward creating a mirror-image ribosome for a reversed central dogma.

Keywords:
chemical protein synthesischiralitynative chemical ligationribonucleoproteinssolid-phase peptide synthesis

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Area of Science:

  • Synthetic Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The central dogma of molecular biology describes the flow of genetic information.
  • Establishing a mirror-image version of the central dogma requires a functional mirror-image translation system.
  • Ribosomes are complex molecular machines responsible for protein synthesis (translation).

Purpose of the Study:

  • To chemically synthesize natural and mirror-image versions of key ribosomal proteins (L5, L18, L25) from Escherichia coli.
  • To investigate the in vitro folding and assembly of these synthetic mirror-image ribosomal proteins with mirror-image 5S ribosomal RNA.
  • To explore the chiral specificity of RNA-protein interactions within the ribosome.

Main Methods:

  • Chemical synthesis of natural and mirror-image ribosomal proteins, including post-translational modifications.
  • In vitro folding assays for synthetic ribosomal proteins.
  • Assembly of synthesized proteins with enzymatically transcribed mirror-image 5S ribosomal RNA into ribonucleoprotein complexes.
  • Analysis of RNA-protein binding specificity using chiral-specific interactions.

Main Results:

  • Successful chemical synthesis of natural and mirror-image versions of E. coli ribosomal proteins L5, L18, and L25.
  • Demonstrated in vitro folding of synthetic mirror-image ribosomal proteins, albeit with limited efficiency.
  • Assembly of mirror-image ribosomal proteins with mirror-image 5S ribosomal RNA into functional ribonucleoprotein complexes.
  • Confirmed chiral-specific RNA-protein interactions, where mirror-image components do not bind to natural counterparts.

Conclusions:

  • The synthesis and assembly of mirror-image 5S ribonucleoprotein complexes represent a significant advancement.
  • These findings are crucial steps toward the ultimate goal of constructing a functional mirror-image ribosome.
  • The study highlights the critical role of chirality in molecular recognition within the ribosomal machinery.