title: Analysis of novel angiotensin I-converting enzyme inhibitory peptides from enzymatic hydrolysates of cuttlefish (Sepia officinalis) muscle proteins.
abstract: The angiotensin I-converting enzyme (ACE) inhibitory activities of protein hydrolysates prepared from cuttlefish (Sepia officinalis) proteins by treatment with various bacterial proteases were investigated. The hydrolysate generated by the crude enzyme from Bacillus mojavensis A21 displayed the highest ACE inhibitory activity, and the higher inhibition activity (87.11 +/- 0.92% at 2 mg/mL) was obtained with hydrolysis degree of 16%. This hydrolysate was fractionated by size exclusion chromatography on a Sephadex G-25 into eight major fractions (P(1)-P(8)). Fraction P(6), which exhibited the highest ACE inhibitory activity, was then fractionated by reversed-phase high performance liquid chromatography (RP-HPLC). Eleven ACE inhibitory peptides were isolated, and their molecular masses and amino acids sequences were determined using ESI-MS and ESI-MS/MS, respectively. The structures of the most potent peptides were identified as Ala-His-Ser-Tyr, Gly-Asp-Ala-Pro, Ala-Gly-Ser-Pro and Asp-Phe-Gly. The first peptide displayed the highest ACE inhibitory activity with an IC(50) of 11.6 microM. The results of this study suggest that cuttlefish protein hydrolysates are a good source of ACE inhibitory peptides.
authors.affiliation: Laboratoire de Genie Enzymatique et de Microbiologie-Ecole Nationale d'Ingenieurs de Sfax, Sfax, Tunisia.
authors.forename: Rafik
authors.initials: R
authors.lastname: Balti
authors.forename: Naima
authors.initials: N
authors.lastname: Nedjar-Arroume
authors.forename: Estelle Yaba
authors.initials: EY
authors.lastname: Adjé
authors.forename: Didier
authors.initials: D
authors.lastname: Guillochon
authors.forename: Moncef
authors.initials: M
authors.lastname: Nasri
mesh_terms: D000806:Angiotensin-Converting Enzyme Inhibitors / Q000737:chemistry* / Q000302:isolation & purification; D000818:Animals; D001407:Bacillus / Q000201:enzymology*; D001426:Bacterial Proteins / Q000737:chemistry*; D006868:Hydrolysis; D007700:Kinetics; D009124:Muscle Proteins / Q000737:chemistry*; D010455:Peptides / Q000737:chemistry* / Q000302:isolation & purification; D007703:Peptidyl-Dipeptidase A / Q000737:chemistry; D049833:Sepia / Q000737:chemistry*
chemical_list: D000806:Angiotensin-Converting Enzyme Inhibitors; D001426:Bacterial Proteins; D009124:Muscle Proteins; D010455:Peptides; D007703:Peptidyl-Dipeptidase A