Assembly of macromolecular complexes by satisfaction of spatial restraints from electron microscopy images.

ABSTRACT: To obtain a structural model of a macromolecular assembly by single-particle EM, a large number of particle images need to be collected, aligned, clustered, averaged, and finally assembled via reconstruction into a 3D density map. This process is limited by the number and quality of the particle images, the accuracy of the initial model, and the compositional and conformational heterogeneity. Here, we describe a structure determination method that avoids the reconstruction procedure. The atomic structures of the individual complex components are assembled by optimizing a match against 2D EM class-average images, an excluded volume criterion, geometric complementarity, and optional restraints from proteomics and chemical cross-linking experiments. The optimization relies on a simulated anne

SUBMITTER: Velazquez-Muriel J 

PROVIDER: S-EPMC3503186 | biostudies-literature | 2012 Nov

REPOSITORIES: biostudies-literature