Dipeptide (Tyr-Ile) Acting as an Inhibitor of Angiotensin-I-Converting Enzyme (ACE) from the Hydrolysate of Jellyfish Nemopilema nomurai

The jellyfish Nemopilema nomurai was hydrolyzed with papain and a novel dipeptide purified via ultrafiltration, gel filtration chromatography with Sephadex LH-20, and reverse phase chromatography using C_(18) and C_(12) columns. The IR, 1H NMR, 13C NMR, and MS spectrometer analyses showed that the dipeptide comprised tyrosine-isoleucine (Tyr-Ile). The IC_(50) and K_i values were 6.56 ± 1.12 and 3.10 ± 0.28 μM, respectively, indicating competitive inhibition of angiotensin-Ι-converting enzyme (ACE). As a novel ACE-inhibitory active peptide, Tyr-Ile may have potential for use in antihypertensive therapy. KCI Citation Count: 0