Protein structure

From DrugPedia: A Wikipedia for Drug discovery

A number of residues are necessary to perform a particular biochemical function, and around 40-50 residues appears to be the lower limit for a functional domain size. Protein sizes range from this lower limit to several thousand residues in multi-functional or structural proteins. However, the current estimate for the average protein length is around 300 residues.Very large aggregates can be formed from protein subunits, for example many thousand actin molecules assemble into a collagen filament.