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We developed time-resolved ion mobility mass spectrometry to study protein dynamics. This method revealed that specific amino acids in cryptochrome are crucial for blue light-induced conformational changes.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Biophysics

Background:

  • Protein conformational changes are vital for biological functions.
  • Understanding protein dynamics requires advanced structural determination methods.
  • Cryptochromes are blue light photoreceptors with flexible C-terminal extensions (CTE) whose structure-function relationship remains unclear.

Purpose of the Study:

  • To introduce and validate a novel time-resolved ion mobility mass spectrometry approach.
  • To investigate the role of specific amino acids in the conformational dynamics of *Chlamydomonas reinhardtii* animal-like cryptochrome (Cr aCRY) upon blue light activation.
  • To elucidate the function of the C-terminal domain and its helix α22 in light-induced structural transitions.

Main Methods:

  • Development of time-resolved ion mobility mass spectrometry with blue light irradiation.
  • Application of the method to a simple photoreceptor model and the *Cr*aCRY system.
  • Analysis of mass and ion mobility spectra to monitor structural changes.

Main Results:

  • The study successfully applied time-resolved ion mobility mass spectrometry to *Cr*aCRY.
  • Aspartate 321 (D321) was identified as essential for triggering large-scale conformational changes in helix α22 and the CTE in the lit state.
  • Aspartate 323 (D323) was found to influence the timing of these conformational changes.

Conclusions:

  • The novel time-resolved ion mobility mass spectrometry method enables the study of rapid protein structural dynamics.
  • Specific amino acid residues, D321 and D323, play critical roles in the blue light-induced conformational transitions of *Cr*aCRY.
  • These findings provide insights into the mechanism of cryptochrome function and light-sensing.