Angiotensin-converting enzyme
Angiotensin-converting enzyme - glycoprotein, is present mainly in the lungs and in small amounts in the brushing of the epithelium of the proximal tubules of the kidneys, the endothelium of the blood vessels and the blood plasma. ACE catalyzes the conversion of angiotensin 1 into angiotensin 2 (one of the most potent vasoconstrictors) and hydrolyses the bradykinin vasodilator to an inactive peptide.