Toward Single Particle Reconstruction without Particle Picking: Breaking the Detection Limit

Tamir Bendory, Nicolas Boumal, William Leeb, Eitan Levin, Amit Singer

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Single-particle cryo-electron microscopy (cryo-EM) has recently joined X-ray crystallography and NMR spectroscopy as a high-resolution structural method to resolve biological macromolecules. In a cryo-EM experiment, the microscope produces images called micrographs. Projections of the molecule of interest are embedded in the micrographs at unknown locations, and under unknown viewing directions. Standard imaging techniques first locate these projections (detection) and then reconstruct the 3-D structure from them. Unfortunately, high noise levels hinder detection. When reliable detection is rendered impossible, the standard techniques fail. This is a problem, especially for small molecules. In this paper, we pursue a radically different approach: we contend that the structure could, in principle, be reconstructed directly from the micrographs, without intermediate detection. The aim is to bring small molecules within reach for cryo-EM. To this end, we design an autocorrelation analysis technique that allows one to go directly from the micrographs to the sought structures. This involves only one pass over the micrographs, allowing online, streaming processing for large experiments. We show numerical results and discuss challenges that lay ahead to turn this proof-of-concept into a complementary approach to state-of-the-art algorithms.

Original languageEnglish (US)
Pages (from-to)886-910
Number of pages25
JournalSIAM Journal on Imaging Sciences
Volume16
Issue number2
DOIs
StatePublished - 2023

Bibliographical note

Publisher Copyright:
© 2023 Society for Industrial and Applied Mathematics.

Keywords

  • autocorrelation analysis
  • cryo-electron microscopy
  • detection

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