title: An in silico model to predict the potential of dietary proteins as sources of dipeptidyl peptidase IV (DPP-IV) inhibitory peptides.
abstract: An in silico approach was developed to predict the potential of 72 dietary proteins to act as a source of dipeptidyl peptidase IV (DPP-IV) inhibitory peptides. The model takes 68 DPP-IV inhibitory peptides (having an IC50 value <2000 μM) and the specific contribution of their amino acids into account. Bovine α-lactalbumin (α-La) and κ-casein (CN) displayed the highest protein coverage (PC, 43.9%) and potency index (PI, 17.9 10(-6) μM(-1)g(-1)), respectively for DPP-IV inhibitory peptides. Sequence alignment of 39 DPP-IV inhibitory peptides having IC50's<200 μM revealed the frequent occurrence of Trp at the N-terminus and Pro at position 2. Canola, chicken egg, oat and wheat were identified as potential sources of DPP-IV inhibitory peptides. In silico approaches may assist in the selection of food proteins for the enzymatic release of DPP-IV inhibitory peptides. The results are relevant to the generation of biofunctional ingredients for glycaemic management.
authors.affiliation: Department of Life Sciences and Food for Health Ireland (FHI), University of Limerick, Limerick, Ireland.
authors.forename: Alice B
authors.initials: AB
authors.lastname: Nongonierma
authors.affiliation: Department of Life Sciences and Food for Health Ireland (FHI), University of Limerick, Limerick, Ireland. Electronic address: dick.fitzgerald@ul.ie.
authors.forename: Richard J
authors.initials: RJ
authors.lastname: FitzGerald
mesh_terms: D000818:Animals; D002364:Caseins / Q000737:chemistry*; D002417:Cattle; D003198:Computer Simulation; D018819:Dipeptidyl Peptidase 4 / Q000737:chemistry*; D054873:Dipeptidyl-Peptidase IV Inhibitors / Q000737:chemistry* / Q000302:isolation & purification; D007768:Lactalbumin / Q000737:chemistry*; D010455:Peptides / Q000737:chemistry* / Q000302:isolation & purification
chemical_list: D002364:Caseins; D054873:Dipeptidyl-Peptidase IV Inhibitors; D010455:Peptides; D007768:Lactalbumin; D018819:Dipeptidyl Peptidase 4
keywords: Bioactive peptides; Dipeptidyl peptidase IV inhibitors; Food proteins; In silico model; Type 2 diabetes