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Related Experiment Videos

Sequence and structure evolved separately in a ribosomal ubiquitin variant.

André Catic1, Zhen-Yu J Sun, Daniel M Ratner

  • 1Department of Biology, Whitehead Institute for Biomedical Research and Massachusetts Institute of Technology, Cambridge, MA 02142, USA.

The EMBO Journal
|June 30, 2007
PubMed
Summary
This summary is machine-generated.

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This study reveals that a variant of ubiquitin in Giardia lamblia, GlUb(S27a), maintains a similar structure to ubiquitin despite evolutionary distance. This structural conservation suggests a chaperone role in the holoribosome.

Area of Science:

  • Molecular Biology
  • Structural Biology
  • Evolutionary Biology

Background:

  • Ubiquitin is a crucial protein involved in ribosome biogenesis and post-translational modification.
  • Ubiquitin is typically fused to ribosomal proteins S27a and L40 in eukaryotes.
  • Some species lack these fused ribosomal ubiquitin domains, suggesting functional divergence.

Purpose of the Study:

  • To determine the structure of a divergent ubiquitin variant, GlUb(S27a), from Giardia lamblia.
  • To investigate the structural and potential functional implications of GlUb(S27a) in the context of the holoribosome.

Main Methods:

  • Solution structure determination of GlUb(S27a).
  • Analysis of GlUb(S27a) integration into the assembled holoribosome.

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Main Results:

  • GlUb(S27a) exhibits a tertiary structure largely identical to canonical ubiquitin.
  • The GlUb(S27a) variant remains associated with the S27a ribosomal subunit within the holoribosome.
  • Primary structure conservation, essential for post-translational modification, is not observed in GlUb(S27a).

Conclusions:

  • The conserved tertiary structure of GlUb(S27a) suggests a role as a chaperone during ribosome assembly.
  • Divergence in primary structure indicates a loss of post-translational modification function for this variant.
  • This study proposes a model for the evolutionary origin of the ubiquitin superfold in eukaryotes.