regulation of protein activity YH, AO If you can detect your protein on a western blot, and it is migrating to the apparent molecular weight that you expect, you can say for definite that the protein is being expressed. This means that the primary structure (i.e. the amino acid chain) has been synthesised. Activity depends on, for example, correct folding of the enzyme, the presence of any required cofactors, proper targetting (e.g. if its a membrane protein) and that there are mutations crucial catalytic residues. Western blotting tells you nothing about these things. (Reference: http://www.protocol-online.org/biology-forums/posts/30248.html) protein activity regulation regulated // activity, regulates // activity, essential // activity, controlled // activity, controls // activity, activity under control, essential for // activity a regulation process that regulates an activity of a protein regulation