Renin, a highly specific aspartyl protease, cleaves angiotensinogen, produced in the liver, to yield angiotensin I, which is further converted into angiotensin II by ACE (Angiotensin Converting Enzyme). Angiotensin II constricts blood vessels, leading to increased blood pressure. It also increases the secretion of ADH and aldosterone, and stimulates the hypothalamus to activate the thirst reflex. Since an overactive renin-angiotensin system leads to hypertension, renin is proposed as a therapeutic target for this disease
The recombinant human pro-renin was expressed in HEK cells and converted to the active renin. After affinity chromatography, the active enzyme has a purity of >99% by SDS-PAGE. The molecular mass of active human renin is approximately 40 kDa.
The activity of enzyme can be measured in FRET-based assays