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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Biochemistry

Background:

  • La-related proteins (LARPs) are crucial RNA-binding proteins regulating gene expression.
  • LARPs possess a conserved La-module (La motif and RNA recognition motif) for RNA binding.
  • LARP1 is vital for ribosomal protein synthesis and mRNA stabilization, but its La-module structure was unknown.

Purpose of the Study:

  • To structurally and functionally characterize the La-module of LARP1.
  • To investigate the RNA binding specificity and mechanism of the LARP1 La-module.
  • To elucidate the role of LARP1 RNA binding in cellular mRNA stabilization.

Main Methods:

  • X-ray crystallography to determine high-resolution structures of the LARP1 La-module.
  • Biochemical assays to assess poly(A) RNA binding affinity and specificity.
  • Quantitative mRNA stabilization assays and poly(A) tail sequencing in cells.

Main Results:

  • The LARP1 La-module lacks an RNA recognition motif (RRM) domain, differing from other LARPs.
  • The La motif alone binds poly(A) RNA with submicromolar affinity and high specificity for the 3' end.
  • Key residues (Q333, Y336, F348) in the La motif are critical for poly(A) RNA binding.
  • LARP1 RNA binding is functionally relevant in cells, contributing to poly(A) 3' protection.

Conclusions:

  • The LARP1 La-module exhibits unique structural features and RNA binding properties.
  • LARP1's La motif is sufficient for specific poly(A) RNA recognition and stabilization.
  • Structural insights into LARP1 RNA binding advance understanding of posttranscriptional regulation.