The Enzyme Renin Converts The Pro Enzyme Angiotensin I Posted on August 20, 2025 by anatomy The Enzyme Renin Converts The Pro Enzyme Angiotensin I: Renin, secreted by the kidneys, catalyzes the conversion of angiotensinogen to angiotensin I, which is further converted to angiotensin II, a vasoconstrictor that raises blood pressure.