XFELs for structure and dynamics in biology.

Area of Science:

• Structural Biology
• Biophysics
• Biochemistry

Background:

• The advent of free-electron X-ray lasers (XFELs) in 2009 revolutionized biological imaging.
• XFELs offer unique capabilities to study molecular dynamics by outrunning radiation damage.
• Previous methods were limited by sample damage and the need for cryogenic conditions.

Purpose of the Study:

• To review the development and applications of XFELs in biological structure and dynamics.
• To outline research opportunities enabled by XFEL technology.
• To identify grand challenges in the field.

Main Methods:

• Serial femtosecond crystallography (SFX)
• Single-particle diffraction (SPD)
• Fast solution scattering (FSS)
• Pump-probe spectroscopy
• Mix-and-inject experiments
• Caged molecule and pH jump studies

Main Results:

• Atomic resolution imaging of molecular processes on the femtosecond timescale.
• Studies under near-physiological conditions, preserving native thermal environments.
• Overcoming radiation damage limitations inherent in traditional methods.
• Enabling the study of transient states and reaction intermediates.

Conclusions:

• XFELs provide unprecedented insights into the function of molecular machines.
• The technology facilitates the study of biological processes in their native states.
• Future research directions include tackling complex biological systems and refining experimental techniques.