We apply molecular and structural biology tools to study the basic genetic processes within the cell and to characterise some of the proteins involved. Structural biology is an interdisciplinary research area, requiring expertises from both the life sciences and the physical sciences. We use protein crystallography to determine the atomic structure of these proteins, as well as biochemical and biophysical approaches to understand how they work. Crystallographic studies are complemented by the concomitant use of electron microscopy to visualise the architecture of large complexes and/or small-angle X-ray scattering (SAXS) to obtain additional structural information.