A common lines approach for ab-initio modeling of molecules with tetrahedral and octahedral symmetry

TL;DR

This paper introduces a robust ab-initio reconstruction algorithm for molecules with tetrahedral and octahedral symmetry in cryo-electron microscopy, leveraging common lines between images to improve 3D modeling accuracy.

Contribution

The paper presents a novel algorithm that uses common lines and self common lines for symmetry-aware 3D reconstruction from noisy cryo-EM images.

Findings

Effective in noisy conditions

Successfully applied to experimental cryo-EM data

Handles molecules with tetrahedral and octahedral symmetry

Abstract

A main task in cryo-electron microscopy single particle reconstruction is to find a three-dimensional model of a molecule given a set of its randomly oriented and positioned noisy projection-images. In this work, we propose an algorithm for ab-initio reconstruction for molecules with tetrahedral or octahedral symmetry. The algorithm exploits the multiple common lines between each pair of projection-images as well as self common lines within each image. It is robust to noise in the input images as it integrates the information from all images at once. The applicability of the proposed algorithm is demonstrated using experimental cryo-electron microscopy data.