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Related Concept Videos

Pre-mRNA Processing: Modification of pre-mRNA Ends01:35

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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, 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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RNA editing is a post-transcriptional modification where a precursor mRNA (pre-mRNA) nucleotide sequence is changed by base insertion, deletion, or modification. The extent of RNA editing varies from a few hundred bases, in mitochondrial DNA of trypanosomes, to a just single base, in nuclear genes of mammals. Even a single base change in the pre-mRNA can convert a codon for one amino acid into the codon for another amino acid or a stop codon. This type of re-coding can significantly affect the...
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The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
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Transcriptional attenuation occurs when RNA transcription is prematurely terminated due to the formation of a terminator mRNA hairpin structure.  Bacteria use these hairpins to regulate the transcription process and control the synthesis of several amino acids including histidine, lysine, threonine, and phenylalanine. Transcription attenuation takes place in the non-coding regions of mRNA.
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A unique mRNA decapping complex in trypanosomes.

Susanne Kramer1, Natalia Katarzyna Karolak2,3, Johanna Odenwald1

  • 1Biocenter, University of Würzburg, Würzburg, Germany.

Nucleic Acids Research
|June 13, 2023
PubMed
Summary
This summary is machine-generated.

Kinetoplastida use a unique decapping complex, featuring ALPH1 and XRNA, to regulate gene expression by removing the mRNA 5' cap. This complex localizes to the posterior pole, differing from other eukaryotes.

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Eukaryotic Gene Expression

Background:

  • mRNA 5' cap removal is crucial for gene expression regulation in eukaryotes.
  • The canonical decapping enzyme Dcp2 and exoribonuclease Xrn1 form a complex in opisthokonts.
  • Kinetoplastida, including Trypanosoma brucei, lack Dcp2 orthologues and utilize the ApaH-like phosphatase ALPH1 for decapping.

Purpose of the Study:

  • To characterize the composition and function of the Kinetoplastida decapping complex.
  • To investigate the role of ALPH1 and its associated proteins in mRNA decapping and localization.
  • To understand the evolutionary divergence of decapping mechanisms between Kinetoplastida and opisthokonts.

Main Methods:

  • In vitro dimerization assays for T. brucei ALPH1.
  • Affinity capture of XRNA in T. cruzi to identify interacting proteins.
  • Cellular localization studies using microscopy to track protein distribution.
  • Analysis of ALPH1 N- and C-terminal domains for functional roles.

Main Results:

  • T. brucei ALPH1 functions as a dimer within a complex including XRNA and four Kinetoplastida-specific proteins.
  • The ALPH1 complex exhibits dynamic localization to a posterior cellular structure.
  • ALPH1's N-terminus is essential for posterior pole localization, while the C-terminus mediates dimerization, interactions, and localization to RNA granules.
  • The trypanosome decapping complex composition is unique compared to opisthokonts.

Conclusions:

  • The Kinetoplastida decapping complex, centered around ALPH1 and XRNA, has a distinct composition and localization.
  • Differential roles of ALPH1 termini suggest regulatory mechanisms for decapping and RNA granule association.
  • This study highlights the unique evolutionary path of gene expression regulation in Kinetoplastida.