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This study reveals how tryptophan residues in Pseudomonas aeruginosa azurin mutants facilitate photoinduced electron transport. Dimerization enables hole hopping, influencing electron transfer pathways and protein complex dynamics.

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Area of Science:

  • Biochemistry
  • Photochemistry
  • Protein Engineering

Background:

  • Investigating photoinduced electron transfer (ET) in metalloprotein complexes is crucial for understanding biological energy transfer.
  • Pseudomonas aeruginosa azurin serves as a model system for studying electron transport dynamics.

Purpose of the Study:

  • To elucidate the role of specific tryptophan residues and dimerization in mediating photoinduced hole hopping and electron transport in azurin mutants.
  • To analyze the influence of protein structure on interfacial electron transfer pathways.

Main Methods:

  • Site-directed mutagenesis to create azurin mutants (Re126WWCuI and Re126FWCuI) with engineered tryptophan residues.
  • Spectroscopic techniques (optical excitation, transient absorption) to monitor electron transport and excited-state dynamics.
  • Concentration-dependent studies to induce and characterize protein dimerization.

Main Results:

  • Engineered tryptophan residues facilitate intramolecular multi-step electron transport (ET) from CuI to the photoexcited Re photosensitizer.
  • Protein dimerization creates intermolecular ET channels, enabling hole hopping between adjacent molecules.
  • The tryptophan quadruplex in {Re126WWCuI}2 acts as a hole storage and crossover unit, influencing ET pathway dynamics.

Conclusions:

  • Adjacent tryptophan residues significantly enhance intramolecular ET in azurin mutants.
  • Dimerization of azurin mutants introduces new intermolecular ET pathways, impacting charge recombination and overall photoreactivity.
  • Understanding these interfacial hole/electron hopping mechanisms provides insights into controlling electron transport in protein complexes.