Abstract
Proteins are perhaps one of themost diverse and complex structuresin nature. The functional diversity of proteins is very broad.Enzymes perform catalytic functions, converting substrates intoproducts with an incredible speed and specificity compared withcommon organic reactions. There are structural proteins in thecytoskeleton and extracellular matrix that are responsible formaintaining cell shape, intracellular transport, cell motility, andcell adhesion. Membrane proteins ormembrane-associated proteinsperform functions such as transport and enzymatic activities. Inaddition, there are many examples of proteins that have character-istic functions and structural roles. Because of such functional andstructural diversity of proteins, it is difficult to capture their im-portant features within any one classification scheme. Furthermore,post-translational modifications such as glycosylation, phosphory-lation, and ubiquitination further complicate the functional andstructural diversity of proteins.
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