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pre-mRNA Processing02:01

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In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
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In eukaryotic cells, nascent mRNA transcripts need to undergo many post-transcriptional modifications to reach the cell cytoplasm and translate into functional proteins. For a long time, transcription and pre-mRNA processing were considered two independent events that occur sequentially in the cell. However, it has now been well established that transcription and pre-mRNA processing are two simultaneous processes that are precisely regulated inside the cell.
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The Intermediate Value Theorem is a foundational result in calculus that guarantees the existence of solutions within certain intervals for continuous functions. Formally, the Intermediate Value Theorem states that if a function f is continuous on the closed interval [a, b], and if N is any value between f(a) and f(b), then there exists at least one c ∈ (a, b) such that f(c) = N. This theorem is instrumental in proving the existence of roots and in analyzing the behavior of continuous...
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Characterization of 16S rRNA Processing with Pre-30S Subunit Assembly Intermediates from E. coli.

Brian A Smith1, Neha Gupta2, Kevin Denny3

  • 1Department of Biology, University of Rochester, Rochester, NY 14627, USA.

Journal of Molecular Biology
|April 17, 2018
PubMed
Summary

Bacterial 16S ribosomal RNA (rRNA) maturation involves complex processing of precursor rRNA. This study reveals multiple enzymatic pathways for 3'-end maturation of 16S rRNA in Escherichia coli, highlighting pathway redundancy.

Keywords:
biogenesisendonucleaseexonucleasematurationribosome

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Area of Science:

  • Molecular Biology
  • Microbiology
  • Genetics

Background:

  • Ribosomal RNA (rRNA) is essential for protein synthesis.
  • 16S rRNA, a key component of the bacterial small ribosomal subunit, is crucial for mRNA decoding.
  • The maturation of precursor rRNA (pre-rRNA) involves precise nucleolytic processing, with 3'-end maturation being less understood than 5'-end maturation.

Purpose of the Study:

  • To investigate the molecular mechanisms and enzymes involved in the 3'-end maturation of bacterial 16S rRNA.
  • To identify the specific nucleolytic activities responsible for processing precursor 16S rRNA (17S rRNA) within small subunit (SSU) assembly intermediates.

Main Methods:

  • Utilized purified in vivo-formed small subunit (SSU) assembly intermediates (pre-SSUs) containing 17S rRNA from wild-type Escherichia coli.
  • Incubated pre-SSUs with E. coli S100 cell extracts and purified candidate enzymes (RNase R, RNase II, PNPase, RNase PH, YbeY).
  • Analyzed the processing of 17S rRNA into mature 16S rRNA and intermediate products using in vitro assays.

Main Results:

  • Exonucleases RNase R, RNase II, PNPase, and RNase PH demonstrated nucleolytic activity on the 3'-end of pre-SSU 17S rRNA in vitro.
  • The endonuclease YbeY did not show nucleolytic activity on pre-SSUs under the tested conditions.
  • Identified dominant maturation pathways: either complete 5'-end processing before 3'-end maturation, or concurrent 5' and 3' end processing.

Conclusions:

  • Bacterial 16S rRNA maturation is a multifaceted process involving multiple redundant enzymatic pathways.
  • Escherichia coli possesses complementary pathways for SSU biogenesis, allowing it to compensate for the inactivation of single enzymes.
  • The identified exonucleases play significant roles in the 3'-end maturation of 16S rRNA, contributing to the robustness of ribosomal biogenesis.