Reconstructing Three-dimensional Helical Structure With an X-Ray Free Electron Laser

TL;DR

This paper presents a novel method for reconstructing three-dimensional helical structures like TMV from randomly oriented XFEL diffraction patterns, leveraging symmetry and Fourier constraints, advancing structural biology capabilities.

Contribution

Developed a new approach for reconstructing helical structures from XFEL data using symmetry and Fourier space constraints, enabling analysis of complex biological molecules.

Findings

Successfully reconstructed TMV helical structure from simulated data.

Demonstrated the method's effectiveness for randomly oriented diffraction patterns.

Enhanced understanding of biological helical structures using XFEL technology.

Abstract

Recovery of three-dimensional structure from single particle X-ray scattering of completely randomly oriented diffraction patterns as predicted few decades back has been real due to the advent of the new emerging X-ray Free Electron Laser (XFEL) technology. As the worlds first XFEL is in operation starting from June 2009 at SLAC National Lab at Stanford, the very first few experiments being conducted on larger objects such as viruses. Many of the important structures of nature such as helical viruses or deoxyribonucleic acids (DNA) consist of helical repetition of biological subunits. Hence development of method for reconstructing helical structure from collected XFEL data has been a top priority research. In this work we have developed a method for solving helical structure such as TMV (tobacco mosaic virus) from a set of randomly oriented simulated diffraction patterns exploiting symmetry and Fourier space constraint of the diffraction volume.