title: LC-MS/MS coupled with QSAR modeling in characterising of angiotensin I-converting enzyme inhibitory peptides from soybean proteins.
abstract: The importance of soy products in reducing the risk of cardiovascular disease is well documented. Our previous computation study has indicated the presence of several potent ACE inhibitory peptides within soybean proteins which needs to be identified. The aim of the study was to identify ACE inhibitory peptides from soy proteins using LC-MS/MS coupled with quantitative structure-activity relationship (QSAR) model. Soybean protein hydrolysate digested by thermolysin showed an IC50 value of 53.6 μg/mL, decreased slightly to 51.8 μg/mL after adding pepsin, and increased to 115.6 μg/mL after adding trypsin. A total of 34 peptides were characterised from LC-MS/MS. Five novel tripeptides, IVF, LLF, LNF, LSW and LEF, with predicted IC50 values lower than 10 μM were synthesized and validated. The results showed that soybean is an excellent source of ACE inhibitory peptides.
authors.affiliation: Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, AB, Canada T6G 2P5.
authors.forename: Yuchen
authors.initials: Y
authors.lastname: Gu
authors.forename: Jianping
authors.initials: J
authors.lastname: Wu
mesh_terms: D000595:Amino Acid Sequence; D000806:Angiotensin-Converting Enzyme Inhibitors / Q000737:chemistry* / Q000302:isolation & purification; D006868:Hydrolysis; D007700:Kinetics; D008969:Molecular Sequence Data; D010449:Peptide Mapping; D010455:Peptides / Q000737:chemistry* / Q000302:isolation & purification; D007703:Peptidyl-Dipeptidase A / Q000737:chemistry; D021281:Quantitative Structure-Activity Relationship; D030262:Soybean Proteins / Q000737:chemistry*; D013025:Glycine max / Q000737:chemistry* / Q000201:enzymology; D053719:Tandem Mass Spectrometry; D013820:Thermolysin / Q000737:chemistry
chemical_list: D000806:Angiotensin-Converting Enzyme Inhibitors; D010455:Peptides; D030262:Soybean Proteins; D007703:Peptidyl-Dipeptidase A; D013820:Thermolysin
keywords: ACE inhibitory peptides; QSAR model; Soybean