Proteins participate at almost all levels of cellular processes among their main functions:
1- Maintenance of oncotic pressure: prot. are macromolecules that hydrate in the plasma and exert a PO retaining water in the vascular medium, all prot. mainly albumin
2- Buffer role: all prot. Plasma acts as a buffer because of their hydrophobic character thus participating in the regulation of acid-base balance
3- Transport function Albumin.Tyroxine binding protein (TBP), transferrin, apoproteins..etc.
4- Enzymes and coenzymes: renin, orosomucoid (coenzymes of LPL)
5- Role in coagulation and fibrinolysis: fibrinogen, thrombin. antithrombin
6- Role in immunity: Ig (lgA JgG.lgM) and complement proteins
7- Role in the allergic: IgE and complement fractions
8- Role in inflammation: α1 antitrypsin, orosomucoides .cerulioplasmin, cytokines, CRP
9- Hormonal role: insulin, glucagon, pituitary stimulins (TSH, FSH, LH)
10- And finally a structural role (such as actin or tubulin that participate in the architecture of the cell, the keratin that makes up the hair);
