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Ribozymes02:47

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The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
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Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
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Hammerhead ribozymes going viral.

Christian Hammann1

  • 1Ribogenetics Biochemistry Lab, Department of Life Sciences and Chemistry, Molecular Life Sciences Research Center, Jacobs University Bremen, Campus Ring 1, DE 28759, Bremen, Germany. c.hammann@jacobs-university.de.

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This summary is machine-generated.

Researchers discovered a link between hammerhead ribozymes and non-autonomous long terminal repeat retrotransposons in plants. This finding reveals the biological role of these self-encoded catalytic RNA molecules within plant genomes.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Plant Science

Background:

  • Genomically encoded ribozymes, such as hammerhead ribozymes, are catalytic RNA molecules found within organismal DNA.
  • Non-autonomous long terminal repeat (LTR) retrotransposons are mobile genetic elements that replicate via an RNA intermediate and rely on other retrotransposons for their mobility.
  • The biological functions of many genomically encoded ribozymes, particularly in plants, remain largely uncharacterized.

Purpose of the Study:

  • To investigate the potential association between hammerhead ribozymes and non-autonomous LTR retrotransposons in plant genomes.
  • To elucidate the biological significance of genomically encoded hammerhead ribozymes in the context of mobile genetic elements.

Main Methods:

  • Bioinformatic analysis of plant genomic sequences to identify hammerhead ribozyme and LTR retrotransposon elements.
  • Comparative genomics to assess the co-occurrence and potential interactions between these elements across different plant species.
  • Phylogenetic analysis to trace the evolutionary history of hammerhead ribozymes in relation to LTR retrotransposons.

Main Results:

  • A significant association was uncovered between hammerhead ribozyme genes and non-autonomous LTR retrotransposons in various plant genomes.
  • Specific hammerhead ribozyme motifs were frequently found integrated within or in close proximity to LTR retrotransposon sequences.
  • The presence and distribution of these associated elements suggest a functional interplay, potentially involving the catalytic activity of ribozymes in retrotransposon biology.

Conclusions:

  • Hammerhead ribozymes are genomically encoded and associated with non-autonomous LTR retrotransposons in plants.
  • This association suggests a novel biological role for hammerhead ribozymes, possibly in regulating or participating in retrotransposon activity.
  • The findings provide critical insights into the evolution and function of both ribozymes and mobile genetic elements within plant genomes.