Novel insight into the formation and inhibition mechanism of dipeptidyl peptidase-Ⅳinhibitory peptides from fermented mandarin fish(Chouguiyu)

• Published in: 食品科学与人类健康（英文） 2023, Vol.12 (6), p.2408-2416
• Main Authors: Daqiao Yang, Chunsheng Li, Laihao Li, Xianqing Yang, Shengjun Chen, Yanyan Wu, Yang Feng
• Format: Article
• Language: English
• ISSN: 2213-4530; 2213-4530
• DOI: 10.1016/j.fshw.2023.03.008

Fermented foods are a potential source to produce novel dipeptidyl peptidase-Ⅳ inhibitory peptides(D4IPs).In this study,the fermented mandarin fish(Chouguiyu)was used to screen D4IPs and their formation mechanism was studied by metagenomics and peptidomics.A total of 400 D4IPs with DPP-Ⅳinhibition structure and high hydrophobicity were identified.The correlation network map showed that Lactococcus,Bacillus,Lysobacter,Pelagivirga,Kocuria,Escherichia,Streptococcus,and Peptostreptococcus were significantly correlated with the most D4IPs.Four stable D4IPs,including KAGARALTDAETAT,GEKVDFDDIQK,VVDADEMYLKGK,and GQKDSYVGDEAQ were respectively from the precursor proteins parvalbumin,troponin,myosin,and actin,and were mainly formed by the hydrolysis of subtilisin(EC 3.4.21.62),aspartic proteinase(EC 3.4.23.1),thermolysin(EC 3.4.24.27),oligopeptidase B(EC 3.4.21.83),and proteinase P1(EC 3.4.21.96)from Bacillus,Kocuria,Lysobacter,Lactococcus,and Peptostreptococcus.The inhibition mainly resulted from the hydrogen bond and salt bridge between D4IPs and DPP-Ⅳ enzyme.This study provides important information on the proteases and related microbial strains to directionally prepare D4IPs in Chouguiyu.