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Characterizing the Conformational Dynamics of an Intrinsically Disordered Localization Sequence.

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Mitochondrial localization peptides (MLPs) remain disordered but subtle sequence changes alter their structure. Even single amino acid substitutions can bias MLP conformation, impacting protein targeting.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Mitochondrial localization peptides (MLPs) are crucial for protein import into mitochondria.
  • Understanding how sequence variations affect MLP conformation is vital for protein targeting research.
  • MLPs are often intrinsically disordered, posing challenges for structural characterization.

Purpose of the Study:

  • To investigate the conformational dynamics of a 15-residue MLP and its single-residue variants.
  • To determine how sequence variations at the second position influence MLP structure and conformational ensemble.
  • To establish a framework for linking sequence changes to functional targeting behavior.

Main Methods:

  • Molecular dynamics simulations of an MLP and its variants.
  • Analysis of peptide compactness, local structural preferences (alpha-helix, beta-sheet, polyproline-like), and conformational heterogeneity.
  • Enhanced sampling techniques to explore the free-energy landscape.

Main Results:

  • All MLP variants remained intrinsically disordered, with modest changes in global compactness.
  • Single-residue substitutions at the second position subtly altered local structural preferences, especially near the N-terminus.
  • Hydrophobic/small residues favored transient alpha-helical structures, while polar/charged residues promoted disorder or beta-/polyproline-like conformations.
  • Distinct mutations were identified that either preserved or significantly deviated from wild-type structural behavior.

Conclusions:

  • Even minor sequence variations in MLPs can significantly bias their dynamic structural ensemble.
  • This sequence-structure-function relationship offers a potential mechanism for modulating mitochondrial targeting efficiency.
  • Advanced sampling methods are essential for characterizing intrinsically disordered localization signals and their conformational dynamics.