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X-ray structure of the human hyperplastic discs protein: an ortholog of the C-terminal domain of poly(A)-binding protein.

The poly(A)-binding protein (PABP) recognizes the 3' mRNA poly(A) tail and plays an essential role in eukaryotic translation initiation and mRNA stabilization/degradation. PABP is a modular protein, with four N-terminal RNA-binding domains and an extensive C terminus. The C-terminal region of PABP is essential for normal growth in yeast and has been implicated in mediating PABP homo-oligomerization and protein-protein interactions. A small, proteolytically stable, highly conserved domain has been identified within this C-terminal segment. Remarkably, this domain is also present in the hyperplastic discs protein (HYD) family of ubiquitin ligases. To better understand the function of this conserved region, an x-ray structure of the PABP-like segment of the human HYD protein has been determined at 1.04-A resolution. The conserved domain adopts a novel fold resembling a right-handed supercoil of four alpha-helices. Sequence profile searches and comparative protein structure modeling identified a small ORF from the Arabidopsis thaliana genome that encodes a structurally similar but distantly related PABP/HYD domain. Phylogenetic analysis of the experimentally determined (HYD) and homology modeled (PABP) protein surfaces revealed a conserved feature that may be responsible for binding to a PABP interacting protein, Paip1, and other shared interaction partners.

Pubmed ID: 11287654


  • Deo RC
  • Sonenberg N
  • Burley SK


Proceedings of the National Academy of Sciences of the United States of America

Publication Data

April 10, 2001

Associated Grants


Mesh Terms

  • Amino Acid Sequence
  • Crystallography, X-Ray
  • Hydrogen-Ion Concentration
  • Models, Molecular
  • Molecular Sequence Data
  • Peptide Synthases
  • Protein Conformation
  • RNA-Binding Proteins
  • Sequence Homology, Amino Acid
  • Ubiquitin-Protein Ligases