title: Cryo-EM Structure Determination Using Segmented Helical Image Reconstruction.
abstract: Treating helices as single-particle-like segments followed by helical image reconstruction has become the method of choice for high-resolution structure determination of well-ordered helical viruses as well as flexible filaments. In this review, we will illustrate how the combination of latest hardware developments with optimized image processing routines have led to a series of near-atomic resolution structures of helical assemblies. Originally, the treatment of helices as a sequence of segments followed by Fourier-Bessel reconstruction revealed the potential to determine near-atomic resolution structures from helical specimens. In the meantime, real-space image processing of helices in a stack of single particles was developed and enabled the structure determination of specimens that resisted classical Fourier helical reconstruction and also facilitated high-resolution structure determination. Despite the progress in real-space analysis, the combination of Fourier and real-space processing is still commonly used to better estimate the symmetry parameters as the imposition of the correct helical symmetry is essential for high-resolution structure determination. Recent hardware advancement by the introduction of direct electron detectors has significantly enhanced the image quality and together with improved image processing procedures has made segmented helical reconstruction a very productive cryo-EM structure determination method.
authors: EMBL-European Molecular Biology Laboratory, Structural and Computational Biology Unit, Heidelberg, Germany.
authors: S A
authors: SA
authors: Fromm
authors: EMBL-European Molecular Biology Laboratory, Structural and Computational Biology Unit, Heidelberg, Germany. Electronic address: carsten.sachse@embl.de.
authors: C
authors: C
authors: Sachse
mesh_terms: D000199:Actins / Q000648:ultrastructure; D000465:Algorithms; D020285:Cryoelectron Microscopy / Q000295:instrumentation / Q000379:methods*; D004583:Electrons; D029968:Escherichia coli Proteins / Q000648:ultrastructure; D005583:Fourier Analysis; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods / Q000706:statistics & numerical data*; D021621:Imaging, Three-Dimensional / Q000295:instrumentation / Q000379:methods; D008958:Models, Molecular; D000072756:Protein Conformation, alpha-Helical; D012984:Software; D014027:Tobacco Mosaic Virus / Q000648:ultrastructure; D014335:Tropomyosin / Q000648:ultrastructure
chemical_list: D000199:Actins; D029968:Escherichia coli Proteins; C471255:ParM protein, E coli; D014335:Tropomyosin
keywords: Direct electron detectors; Helical assemblies; Helical symmetry; Near-atomic resolution; Segmented helical reconstruction; Single-particle helical reconstruction; Tobacco mosaic virus