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The SSU Processome Component Utp25p is a Pseudohelicase.

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Utp25, a protein essential for growth, was studied for its role in ribosome assembly. Despite sequence similarity to RNA helicases, its DEAD-box motifs are dispensable, identifying it as a pseudohelicase.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • RNA helicases are crucial for RNA metabolism and ribosome assembly.
  • The small subunit (SSU) processome contains 10 helicases and cofactors that facilitate ribosomal SSU assembly.
  • Utp25/Def is an essential protein identified as a component of the SSU processome.

Purpose of the Study:

  • To investigate the function and structural characteristics of Utp25, a protein with sequence similarity to DEAD-box RNA helicases.
  • To determine if the DEAD-box motifs of Utp25 are essential for its function.
  • To classify Utp25 within the RNA helicase family.

Main Methods:

  • Sequence similarity analysis comparing Utp25 to known DEAD-box RNA helicases.
  • Mutational analysis to assess the dispensability of Utp25's DEAD-box motifs.
  • Structural prediction using AlphaFold to model Utp25's tertiary structure.

Main Results:

  • Utp25 is essential for cellular growth.
  • Mutational ablation of Utp25's DEAD-box motifs did not impair its essential function.
  • AlphaFold structural prediction revealed significant structural similarity to DEAD-box RNA helicases.

Conclusions:

  • Utp25 functions as a pseudohelicase, lacking canonical RNA helicase activity despite structural resemblance.
  • The DEAD-box motifs in Utp25 are not required for its essential role in ribosome biogenesis.
  • This study identifies and validates Utp25 as the first pseudohelicase.