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Albany 2019: 20th Conversation - Abstracts

category image Albany 2019
Conversation 20
June 11-15 2019
Adenine Press (2019)

The Structure and Dynamics of Biomolecules in Their Native States

The aim of Structural Biology is to explain life processes in terms of macromolecular interactions in the cell. These interactions typically involve more than two partners, and can run up to dozens. A full description will need to characterize all structures on the atomic level, and the way these structures change in the process. Because of the crowded environment of the cell, such characterization is presently (but see below) only possible when the group of interacting molecules (often organized into processive “molecular machines”) is isolated and studied in vitro. While X-ray crystallography has provided structures of a large number of molecular structures, the need for crystals diffracting to high resolution has severely limited the number of supramolecular assemblies and the range of conformers that can be studied with this technique. Single-particle cryo-electron microscopy is about to fill this gap, allowing functional processes to be studied in great detail without imposing restraints on the structures. There are many examples now for this expansion of Structural Biology toward a full characterization of a functional process. Future developments of single-particle cryo-EM include the study of short-lived intermediates in a nonequilibrium system by time-resolved techniques, and the characterization of continuous structural changes using data mining from large ensembles of molecule images. It is very interesting and promising that another technique of cryo-EM, cryo-electron tomography of FIB-milled cell sections, has started to contribute information about processes even within the cellular context. Distinct ribosome states, for instance, have already been identified and localized by subtomogram averaging. With this advance, we get closer to the fulfillment of the most ambitious aim of Structural Biology, the visualization and interpretation of molecular interactions in situ.

Joachim Frank

Department of Biochemistry and Molecular Biophysics
Columbia University
New York, NY 10032

Ph: (212) 305 9510
Fx: (212) 305 9500
Email: jf2192@cumc.columbia.edu