Exploiting fourth-generation synchrotron radiation for enzyme and photoreceptor characterization

Area of Science:

• Structural Biology
• Biophysics
• Materials Science

Background:

• The European Synchrotron Radiation Facility (ESRF) upgrade to an Extremely Brilliant Source (EBS) enables advanced time-resolved synchrotron serial crystallography (SSX).
• The new ID29 beamline at ESRF-EBS is specifically designed for SSX experiments.

Purpose of the Study:

• To report on initial experiments using the ID29 beamline at ESRF-EBS.
• To demonstrate the capability of microsecond X-ray pulses for SSX.
• To investigate protein dynamics and radiation damage in microcrystals.

Main Methods:

• Synchrotron serial crystallography (SSX) using microsecond X-ray pulses.
• Time-resolved experiments utilizing photoactivatable proteins.
• Analysis of microcrystals of photoactive yellow protein, cytochrome c nitrite reductase (ccNiR), and a myxobacterial phytochrome.

Main Results:

• Successful application of microsecond pulses for SSX with model systems.
• Investigation of radiation damage at heme-iron sites in ccNiR.
• Proof-of-concept for subsecond time-resolved SSX experiments.

Conclusions:

• The ID29 beamline at ESRF-EBS is capable of high-resolution, time-resolved SSX.
• Microsecond X-ray pulses open new avenues for studying fast biological processes.
• Further research can explore protein dynamics and radiation effects with unprecedented temporal resolution.