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Updated: Sep 17, 2025

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Human FASTK preferentially binds single-stranded and G-rich RNA.

Daria M Dawidziak1, Dawid A Dzadz1, Mikołaj I Kuska1

  • 1Structural Biology Group, Faculty of Chemistry, Biological and Chemical Research Centre, University of Warsaw, Poland.

The FEBS Journal
|July 2, 2025
PubMed
Summary
This summary is machine-generated.

Fas-activated serine/threonine kinase (FASTK) binds G-rich RNA, protecting mitochondrial mRNAs from degradation. This study reveals FASTK

Keywords:
FASTKG‐rich RNARNA degradationRNA‐binding proteins

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Area of Science:

  • Molecular Biology
  • RNA Biology
  • Biochemistry

Background:

  • Fas-activated serine/threonine kinase (FASTK) is crucial for mRNA fate regulation.
  • FASTK variants influence mRNA splicing, translation, and degradation.
  • Specific RNA recognition mechanisms of FASTK were previously unknown.

Purpose of the Study:

  • To investigate the direct RNA binding properties of human FASTK.
  • To elucidate the structural basis of FASTK-RNA interactions.
  • To understand FASTK's role in mitochondrial mRNA stability.

Main Methods:

  • Purification of human FASTK.
  • In vitro RNA binding assays using G-rich oligonucleotides.
  • Small-Angle X-ray Scattering (SAXS) for structural analysis.
  • Point mutagenesis to identify RNA-binding regions.

Main Results:

  • FASTK directly binds single-stranded, G-rich RNA, including G-quadruplex forming sequences.
  • FASTK protects mitochondrial mRNAs from degradation by the degradosome.
  • SAXS revealed FASTK as a monomer with an extended conformation in solution.
  • Mutagenesis identified an exposed RNA-binding interface in the central helical region.

Conclusions:

  • FASTK possesses intrinsic RNA-binding capabilities favoring specific G-rich structures.
  • FASTK's RNA binding directly contributes to mitochondrial mRNA stability.
  • The structural and biochemical properties of FASTK underpin its diverse roles in mRNA metabolism.