title: Purification and characterization of angiotensin I converting enzyme inhibitory peptides from the rotifer, Brachionus rotundiformis.
abstract: Angiotensin I converting enzyme (ACE) inhibitory peptide was isolated from the marine rotifer, Brachionus rotundiformis. ACE inhibitory peptides were separated from rotifer hydrolysate prepared by Alcalase, alpha-chymotrypsin, Neutrase, papain, and trypsin. The Alcalase hydrolysate had the highest ACE inhibitory activity compared to the other hydrolysates. The IC(50) value of Alcalase hydrolysate for ACE inhibitory activity was 0.63 mg/ml. We attempted to isolate ACE inhibitory peptides from Alcalase prepared rotifer hydrolysate using gel filtration on a Sephadex G-25 column and high performance liquid chromatography on an ODS column. The IC(50) value of purified ACE inhibitory peptide was 9.64 microM, and Lineweaver-Burk plots suggest that the peptide purified from rotifer protein acts as a competitive inhibitor against ACE. Amino acid sequence of the peptide was identified as Asp-Asp-Thr-Gly-His-Asp-Phe-Glu-Asp-Thr-Gly-Glu-Ala-Met, with a molecular weight 1538 Da. The results of this study suggest that peptides derived from rotifers may be beneficial as anti-hypertension compounds in functional foods resource.
authors.affiliation: Faculty of Marine Bioscience and Technology, Kangnung-Wonju National University, 120 Gangneung Daehakro, Gangneung 210-720, Republic of Korea.
authors.forename: Jung Kwon
authors.initials: JK
authors.lastname: Lee
authors.forename: Suhee
authors.initials: S
authors.lastname: Hong
authors.forename: Joong-Kyun
authors.initials: JK
authors.lastname: Jeon
authors.forename: Se-Kwon
authors.initials: SK
authors.lastname: Kim
authors.forename: Hee-Guk
authors.initials: HG
authors.lastname: Byun
mesh_terms: D000595:Amino Acid Sequence; D000806:Angiotensin-Converting Enzyme Inhibitors / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D000818:Animals; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D006868:Hydrolysis / Q000187:drug effects; D010455:Peptides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D007703:Peptidyl-Dipeptidase A / Q000378:metabolism; D011492:Protein Hydrolysates / Q000737:chemistry / Q000494:pharmacology; D011817:Rabbits; D012403:Rotifera / Q000737:chemistry*; D020539:Sequence Analysis, Protein
chemical_list: D000806:Angiotensin-Converting Enzyme Inhibitors; D010455:Peptides; D011492:Protein Hydrolysates; D007703:Peptidyl-Dipeptidase A