Structural Biology is the study of life and biological phenomena at the molecular and atomic level. The goals of structural biology include developing a comprehensive understanding of the molecular shapes and forms embraced by biological macromolecules and extending this knowledge to understand how different molecular architectures are used to perform the chemical reactions that are central to life. (See protein crystal images below)
To get a window into Structural Biology, see examples below of various proteins structures which were solved by x-ray crystallography.
Image: Structure of the Apoptosome-Procaspase-9 – CARD Complex
Image: The structure of human apolipoprotein A-I, the major protein component of high density lipoprotein.
Image: Tetrameric LacI binds two operator sequences and induces DNA looping