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Correlative Microscopy for 3D Structural Analysis of Dynamic Interactions
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Interactive structural analysis of βTrCP1 and PER2 phosphoswitch binding through dynamics simulation assay.

Najumuddin1, Muhammad Fakhar1, Mehreen Gul1

  • 1National Center for Bioinformatics, Quaid-i-Azam University, Islamabad, Pakistan.

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|June 2, 2018
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Summary

Altering the PERIOD2 (PER2) protein's interaction site with β-transducin repeat-containing protein (βTrCP1) impacts circadian rhythm regulation. This study reveals how phosphorylation changes affect PER2 stability and the circadian clock.

Keywords:
Circadian rhythmPhosphodegronPhosphorylationSleep-wake cycle

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Area of Science:

  • Molecular Biology
  • Chronobiology
  • Structural Biology

Background:

  • Circadian rhythms govern daily biological processes through rhythmic gene expression.
  • Disruptions in the sleep-wake cycle, linked to rhythmic sleep disorders, are influenced by the phosphorylation of PERIOD2 (PER2) phosphodegron.
  • PER2's interaction with β-transducin repeat-containing protein (βTrCP1) is crucial for this regulation.

Purpose of the Study:

  • To investigate the in silico interaction patterns between βTrCP1 and various PER2 phosphodegron peptides.
  • To understand the structural consequences of altering key phosphorylation sites on PER2-βTrCP1 binding.
  • To elucidate the role of phosphorylation in stabilizing the PER2-βTrCP1 interaction and its impact on circadian rhythm.

Main Methods:

  • In silico computational modeling was used to analyze protein-protein interactions.
  • The study focused on wild-type PER2 (PER2WT) and mutant PER2 peptides (PER2SER480ALA, PER2SER484ALA).
  • Analysis of binding interfaces, conformational changes, and structural alterations upon peptide binding.

Main Results:

  • Substitution of serine residues (SER480, SER484) with alanine shifted PER2 phosphodegron binding to the lower face of βTrCP1.
  • PER2 binding induced conformational changes in ARG524, forming a tunnel-like structure within βTrCP1.
  • Unphosphorylated PER2 binding to βTrCP1 may be less stable, potentially increasing cytoplasmic PER2 levels.

Conclusions:

  • The study provides insights into the structural basis of the PER2-βTrCP1 phosphoswitch mechanism in mammalian circadian rhythms.
  • Compromised binding stability in the absence of phosphorylation could disrupt the circadian clock and contribute to aging.
  • Understanding these interactions is key to comprehending circadian oscillation regulation.