Structure determination from single molecule X-ray scattering with three photons per image.

ABSTRACT: Scattering experiments with femtosecond high-intensity free-electron laser pulses provide a new route to macromolecular structure determination. While currently limited to nano-crystals or virus particles, the ultimate goal is scattering on single biomolecules. The main challenges in these experiments are the extremely low signal-to-noise ratio due to the very low expected photon count per scattering image, often well below 100, as well as the random orientation of the molecule in each shot. Here we present a de novo correlation-based approach and show that three coherently scattered photons per image suffice for structure determination. Using synthetic scattering data of a small protein, we demonstrate near-atomic resolution of  3.3 Å using 3.3 × 10¹⁰ coherently scattered photo

SUBMITTER: von Ardenne B 

PROVIDER: S-EPMC6006178 | biostudies-literature | 2018 Jun

REPOSITORIES: biostudies-literature