Gu Yuxiang, Li Xing, Qi Xiaofen, Ma Ying, Chan Eric Chun Yong
School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, 150001, Heilongjiang, China.
Department of Pharmacy, Faculty of Science, National University of Singapore, 18 Science Drive 4, Singapore, 117543, Singapore.
Amino Acids. 2023 Feb;55(2):161-171. doi: 10.1007/s00726-022-03202-z. Epub 2023 Jan 26.
The capacity of buffalo milk proteins to release bioactive peptides was evaluated and novel bioactive peptides were identified. The sequential similarity between buffalo milk proteins and their cow counterparts was analysed. Buffalo milk proteins were simulated to yield theoretical peptides via in silico proteolysis. The potential of selected proteins to release specific bioactive peptides was evaluated by the A value obtained from the BIOPEP-UWM database (Minkiewicz et al. in Int J Mol Sci 20(23):5978, 2019). Buffalo milk protein is a suitable precursor to produce bioactive peptides, particularly dipeptidyl peptidase IV (DPP-IV) and angiotensin I-converting enzyme (ACE) inhibitory peptides. Two novel ACE inhibitory peptides (KPW and RGP) and four potential DPP-IV inhibitory peptides (RGP, KPW, FPK and KFTW) derived from in silico proteolysis of buffalo milk proteins were screened using different integrated bioinformatic approaches (PeptideRanker, Innovagen, peptide-cutter and molecular docking). The Lineweaver-Burk plots showed that KPW (IC = 136.28 ± 10.77 μM) and RGP (104.72 ± 8.37 μM) acted as a competitive inhibitor against ACE. Similarly, KFTW (IC = 873.92 ± 32.89 μM) was also a competitive inhibitor of DPP-IV, while KPW and FPK (82.52 ± 10.37 and 126.57 ± 8.45 μM, respectively) were mixed-type inhibitors. It should be emphasized that this study does not involve any clinical trial.
评估了水牛奶蛋白释放生物活性肽的能力，并鉴定了新型生物活性肽。分析了水牛奶蛋白与其牛奶对应物之间的序列相似性。通过计算机模拟蛋白酶解模拟水牛奶蛋白以产生理论肽。通过从BIOPEP-UWM数据库（Minkiewicz等人，《国际分子科学杂志》20(23):5978, 2019）获得的A值评估所选蛋白质释放特定生物活性肽的潜力。水牛奶蛋白是生产生物活性肽的合适前体，特别是二肽基肽酶IV（DPP-IV）和血管紧张素I转换酶（ACE）抑制肽。使用不同的综合生物信息学方法（PeptideRanker、Innovagen、肽切割器和分子对接）筛选了两种源自水牛奶蛋白计算机模拟蛋白酶解的新型ACE抑制肽（KPW和RGP）和四种潜在的DPP-IV抑制肽（RGP、KPW、FPK和KFTW）。Lineweaver-Burk图表明，KPW（IC = 136.28 ± 10.77 μM）和RGP（104.72 ± 8.37 μM）作为ACE的竞争性抑制剂起作用。同样，KFTW（IC = 873.92 ± 32.89 μM）也是DPP-IV的竞争性抑制剂，而KPW和FPK（分别为82.52 ± 10.37和126.57 ± 8.45 μM）是混合型抑制剂。应该强调的是，本研究不涉及任何临床试验。
