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Poly(UG) repeats fold into a specific quadruplex structure, the pUG fold, crucial for RNAi amplification. This fold requires potassium ions and tolerates some sequence variations, aiding in predicting its occurrence in eukaryotic transcriptomes.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Poly(UG) repeats form a left-handed parallel quadruplex structure known as the pUG fold.
  • This pUG fold plays a role in the epigenetic amplification of RNA interference (RNAi) in *C. elegans*.
  • pUG sequences are frequently found in eukaryotic transcriptomes.

Purpose of the Study:

  • To elucidate the sequence and ionic requirements for the formation of the pUG fold.
  • To understand how sequence variations and ionic conditions affect pUG fold stability.
  • To improve the prediction of pUG fold formation in biological contexts.

Main Methods:

  • Investigated the folding requirements of poly(UG) RNA sequences.
  • Tested various nucleotide substitutions and deoxyribose modifications.
  • Assessed the impact of different cations (K+, Na+, NH4+, Mg2+) and polyamines (spermine, spermidine) on folding.
  • Examined the influence of flanking sequences on pUG fold stability.

Main Results:

  • The pUG fold preferentially incorporates 12 guanosines and tolerates nucleotide substitutions, with some variants folding more efficiently than poly(UG) RNA.
  • (GA)12 repeats form a similar fold with lower stability.
  • The fold tolerates some deoxyribose substitutions but not a fully deoxyribose backbone.
  • High affinity and specificity for potassium ions (K+); no folding observed in sodium or ammonium.
  • Magnesium ions and polyamines do not significantly stabilize the fold.
  • Surrounding sequences can either stabilize or interfere with pUG fold formation.

Conclusions:

  • The pUG fold has specific sequence and ion requirements, primarily favoring potassium ions.
  • Sequence flexibility and the influence of flanking regions are critical factors in pUG fold formation.
  • These findings enhance the understanding and predictive capability of pUG fold occurrence and function in eukaryotes.