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Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns—non-coding regions of a gene—or intergenic regions—stretches of DNA present between genes. Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA ends...
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A Reporter Assay to Analyze Intronic microRNA Maturation in Mammalian Cells
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Human miRNA precursors with box H/ACA snoRNA features.

Michelle S Scott1, Fabio Avolio, Motoharu Ono

  • 1Division of Biological Chemistry and Drug Discovery, College of Life Sciences, University of Dundee, Dundee, United Kingdom. michelle@compbio.dundee.ac.uk

Plos Computational Biology
|September 19, 2009
PubMed
Summary

This study explores the evolutionary links between microRNAs (miRNAs) and box H/ACA small nucleolar RNAs (snoRNAs). Researchers found that some miRNAs share features with snoRNAs, suggesting a shared evolutionary origin and potential dual functionality.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Evolutionary Biology

Background:

  • MicroRNAs (miRNAs) and small nucleolar RNAs (snoRNAs) are key non-coding RNAs with distinct cellular roles.
  • Recent findings suggest processed snoRNAs can resemble miRNAs, hinting at potential connections.
  • Genomic similarities and overlapping sequences between miRNAs and snoRNAs warrant investigation into their evolutionary relationship.

Purpose of the Study:

  • To investigate a potential evolutionary relationship between microRNAs (miRNAs) and box H/ACA snoRNAs.
  • To identify miRNAs that may have evolved from snoRNA-encoding genomic regions.
  • To explore shared features and potential dual functionality between these RNA classes.

Main Methods:

  • Comparative genomic analysis of miRNA and snoRNA locations.
  • Bioinformatic prediction of box H/ACA snoRNA features in miRNA precursors using snoGPS.
  • Structural analysis of predicted H/ACA snoRNA-like miRNA precursors.
  • Examination of genomic regions surrounding predicted snoRNA-like miRNAs for retroposon features.
  • Biochemical assays to test binding of specific miRNA precursors to dyskerin.

Main Results:

  • An overlap in genomic locations between specific miRNAs and snoRNAs was identified.
  • Twenty miRNA precursors exhibited significant similarity to box H/ACA snoRNAs.
  • These H/ACA snoRNA-like miRNAs are predicted to target rRNA pseudouridylation sites.
  • Genomic regions of these miRNAs resemble snoRNA retroposon loci.
  • Five H/ACA snoRNA-like miRNA precursors demonstrated binding to dyskerin, indicating retained snoRNA function.

Conclusions:

  • The findings suggest a possible evolutionary relationship between miRNAs and box H/ACA snoRNAs.
  • Some miRNAs may have originated from snoRNA genomic regions and retain snoRNA functionality.
  • This overlap in features indicates a potential dual role for certain small non-coding RNAs.