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tRNA Modification Landscapes in Streptococci: Shared Losses and Clade-Specific Adaptations.

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Summary
This summary is machine-generated.

This study maps tRNA modifications in Streptococcus pathogens, revealing a loss of iron-sulfur enzyme-dependent modifications and distinct metabolic pathways. Differences in essential modification genes highlight their crucial role in bacterial translational control.

Keywords:
DihydrouridineQueuosineTsaEpseudogenet6AtRNA modification

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genomics

Background:

  • Transfer RNA (tRNA) modifications are crucial for bacterial translational control and gene expression.
  • Gram-positive pathogens like Streptococcus mutans and Streptococcus pneumoniae possess unique tRNA modification profiles.

Purpose of the Study:

  • To comprehensively map tRNA modification genes in S. mutans and S. pneumoniae.
  • To investigate the functional significance of these modifications and associated enzymes.
  • To compare tRNA modification pathways across streptococcal species.

Main Methods:

  • Genetics
  • Mass spectrometry
  • Epitranscriptomics
  • Comparative genomics
  • Essentiality profiling

Main Results:

  • Both species exhibit reduced iron-sulfur enzyme-dependent tRNA modifications.
  • Specific modifications (D, m1A, m7G, t6A, i6A) were mapped in S. pneumoniae, with DusB1 identified as the sole D modification enzyme.
  • Distinct queuosine (Q) metabolism pathways were observed: S. mutans synthesizes Q de novo, while S. pneumoniae salvages preQ1.
  • Comparative genomics revealed conserved Q metabolism strategies across 1,599 streptococcal genomes.
  • The N-threonylcarbamoyladenosine (t6A) synthesis enzyme TsaE is essential in S. pneumoniae but not S. mutans.
  • Suppressor mutations in asnS (encoding AsnRS) partially restored viability to ΔtsaE mutants.

Conclusions:

  • tRNA modification patterns vary significantly between S. mutans and S. pneumoniae, reflecting adaptations in central metabolism and enzyme utilization.
  • The study underscores the functional importance of tRNA modifications in aminoacyl-tRNA synthetase recognition and bacterial viability.
  • Comparative analysis provides insights into the evolution and conservation of tRNA modification pathways within the Streptococcus genus.