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Hidden Structural Codes in Protein Intrinsic Disorder.

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Evolution reveals hidden structural codes in intrinsically disordered proteins. Conserved residues in papillomavirus E7 oncoprotein act as folding relays, influencing protein structure and function.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Virology

Background:

  • Intrinsically disordered proteins (IDPs) comprise over 30% of coding regions but challenge conventional protein chemistry due to their dynamic conformational ensembles.
  • Human papillomaviruses (HPVs) offer a unique model for studying sequence-structure-function relationships in proteins lacking stable tertiary structures.
  • The E7 oncoprotein of HPVs is a key example of an intrinsically disordered protein with significant biological implications.

Purpose of the Study:

  • To investigate the role of conserved residues in the intrinsically disordered N-terminal domain of the HPV E7 oncoprotein.
  • To identify evolutionary insights into the structural and functional properties of intrinsically disordered proteins.
  • To uncover potential hidden structural codes governing the conformational ensembles of IDPs.

Main Methods:

  • Comparative sequence analysis of numerous viral protein variants to identify conserved residues.
  • Site-directed mutagenesis of conserved residues within the intrinsically disordered domain of E7.
  • Biophysical characterization of mutant proteins to assess changes in structural content (α-helix, β-sheet), equilibrium propensities, and oligomerization kinetics.

Main Results:

  • Identification of a few absolutely conserved residues, predominantly leucine, within the N-terminal intrinsically disordered domain of E7.
  • Mutagenesis of these conserved residues resulted in a significant increase in α-helix and β-sheet content.
  • Observed drastic alterations in equilibrium propensities and oligomerization kinetics, indicating the presence of local structural elements opposing canonical folding.

Conclusions:

  • Evolutionary analysis highlights specific 'conformational hot spots' within intrinsically disordered proteins that are not easily detectable by standard experimental methods.
  • Conserved residues in HPV E7 act as 'folding relays,' influencing the protein's conformational landscape and function.
  • These findings suggest the existence of previously unrecognized structural codes underlying intrinsic disorder, offering new avenues for understanding protein behavior.