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Magnetosensitivity of Model Flavin-Tryptophan Radical Pairs in a Dynamic Protein Environment.

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Migratory songbirds may use cryptochrome proteins in their eyes as a magnetic compass. New computational methods simulate these quantum spin dynamics, revealing how molecular motion impacts magnetic field sensitivity.

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Area of Science:

  • Biophysics
  • Quantum Biology
  • Computational Chemistry

Background:

  • Cryptochrome proteins in bird retinas are hypothesized to be magnetoreceptors.
  • The magnetic compass sense in migratory songbirds relies on light-induced radical pairs within these proteins.
  • Simulating the quantum spin dynamics of these large systems presents significant computational challenges.

Purpose of the Study:

  • To develop and apply novel computational methods for simulating the quantum spin dynamics of cryptochrome-based magnetoreceptors.
  • To investigate the influence of time-dependent magnetic interactions and molecular motion on sensor performance.
  • To identify key frequencies of molecular motion affecting sensitivity to Earth-strength magnetic fields.

Main Methods:

  • Employed newly developed computational methods combining molecular dynamics simulations and electronic structure calculations.
  • Incorporated explicitly time-dependent internal magnetic interactions.
  • Efficiently and accurately modeled spin dynamics of multinuclear electron-nuclear spin systems.

Main Results:

  • Identified the frequency range of molecular motions most impactful for magnetic compass sensitivity.
  • Gained insights into how thermal modulations of electron-nuclear hyperfine interactions can enhance detection sensitivity.
  • Successfully simulated quantum spin dynamics for biologically relevant timescales (exceeding a microsecond).

Conclusions:

  • The developed computational approach provides a powerful tool for understanding cryptochrome-based magnetoreception.
  • Molecular motion and hyperfine interactions play crucial roles in the sensitivity and function of the avian magnetic compass.
  • Further research can leverage these methods to explore quantum effects in biological systems.