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Thermospermine: An Evolutionarily Ancient but Functionally New Compound in Plants.

Taku Takahashi1

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PubMed
Summary

Thermospermine, found in plants, regulates xylem vessel growth. A study on the Arabidopsis acl5 mutant shows thermospermine controls xylem proliferation by enhancing specific mRNA translation, impacting plant development.

Keywords:
Acaulis5ArabidopsisThermospermineXylemmRNA translationuORF

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Area of Science:

  • Plant biology
  • Molecular genetics
  • Biochemistry

Background:

  • Thermospermine, a spermine isomer, is found in bacteria and plants.
  • The Arabidopsis mutant acaulis5 (acl5) exhibits defective thermospermine biosynthesis, leading to excessive xylem vessel proliferation and dwarfed growth.

Purpose of the Study:

  • To investigate the role of thermospermine in regulating xylem vessel development.
  • To elucidate the molecular mechanism by which thermospermine controls xylem proliferation.

Main Methods:

  • Analysis of the Arabidopsis acl5 mutant and its suppressor mutants.
  • Investigation of mRNA translation regulation.

Main Results:

  • The acl5 mutant shows excessive xylem vessel proliferation and dwarfed growth due to defective thermospermine biosynthesis.
  • Thermospermine was found to negatively control xylem vessel proliferation.
  • This regulation occurs through enhancing the translation of specific mRNAs containing a conserved upstream open-reading-frame (uORF) in the 5' leader region.

Conclusions:

  • Thermospermine is a crucial regulator of xylem vessel development in plants.
  • The molecular mechanism involves the modulation of translation for specific mRNAs with uORFs.
  • Understanding this pathway offers insights into plant growth and vascular development.