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Related Experiment Videos

Evolutionally conserved intermediates between ubiquitin and NEDD8.

Ryo Kitahara1, Yoshiki Yamaguchi, Eri Sakata

  • 1RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-chou, Sayo-gun, Hyogo, 679-5148, Japan.

Journal of Molecular Biology
|September 19, 2006
PubMed
Summary
This summary is machine-generated.

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Ubiquitin and NEDD8 proteins share similar structures but differ in function. Differences in their thermodynamic stability and disordered states explain their distinct physiological roles.

Area of Science:

  • Biochemistry
  • Structural Biology
  • Protein Dynamics

Background:

  • Proteins with similar topologies can have divergent amino acid sequences.
  • The ubiquitin superfold is a common structural motif found in proteins with conserved topologies but poor sequence conservation.

Purpose of the Study:

  • To investigate novel similarities and differences between ubiquitin and NEDD8 proteins.
  • To understand how structural similarity relates to functional divergence.

Main Methods:

  • Variable pressure Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Analysis of conformational fluctuations and thermodynamic stability.

Main Results:

  • Ubiquitin and NEDD8 share 57% sequence identity, similar backbone topology, and functional strategies, despite different physiological functions.

Related Experiment Videos

  • Both proteins exhibit similar conformational fluctuations in enzyme-binding regions and possess a disordered conformer (I) in equilibrium with a folded conformer (N).
  • NEDD8 shows a significantly higher population of the disordered conformer (I) and a greater tendency for overall unfolding (U) compared to ubiquitin, indicating lower thermodynamic stability.

    • Conclusions:

    • Differences in the thermodynamic stabilities of disordered conformers and unfolding species are critical for the distinct physiological functions of structurally similar proteins like ubiquitin and NEDD8.
    • Protein structural similarity does not always equate to functional similarity, with dynamics and stability playing key roles.