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Purification and charicterization of angiotensin I-converting enzyme (ACE) inhibitory peptides with specific structure X-Pro

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Abstract

This study aimed to specifically prepare angiotensin I-converting enzyme (ACE) inhibitory peptides rich in C-terminal proline from oyster proteins using chymotrypsin and proline-specific endopeptidases (PSEases). The hydrolysates were purified with Sephadex G25, Superdex™ 30 Increase 10/300 GL gel filtration chromatography and reverse-phase high-performance liquid chromatography (RP-HPLC). The ACE inhibitory IC50 of purified fraction (G1E1C1) was 0.032 ± 0.003 mg/mL. According to ESI–MS and ESI–MS/MS analyses, there were three novel ACE inhibitory peptides in G1E1C1 fraction. Their sequences were Ser-Ala-Pro, Ala-Met-Pro and Thr-Ser-Gly-Pro. Molecular docking of peptides to ACE was studied. Metal–acceptor interactions and conventional hydrogen bonds greatly promoted the stability of peptides to ACE interaction. Pyrrole ring of proline may lead to higher inhibitory activity of peptides. It easily formed a Pi–alkyl interaction with aromatic ring residues (His353, His387, His513, and Phe512). Pi interactions may promote the effect of peptides on ACE. Also, C atom adjacent to the N atom of the pyrrole ring easily formed a carbon hydrogen bond with Ala354. The research discovered three novel ACE inhibitory peptides and provided a method to obtain ACE inhibitory peptides with specific structure X-Pro. The research result played an important role in revealing the structure–activity relationship of ACE inhibitory peptides and designing novel peptides with enhanced biological activity.

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Acknowledgements

This work was supported by National Key R&D Program of China (Grant No. 2017YFC1600703), Fundamental Research Funds for the Central Universities (Grant No. 201864002), and the Key Research and Development Project Foundation of Shandong Province (Grant No. 2017YYSP003).

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  1. College of Food Science and Engineering, Ocean University of China, No. 5 Yushan Road, Qingdao, 266003, Shandong, China

    Tan Zhang, Meng Li, Xiaodan Fu & Haijin Mou

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  1. Tan Zhang
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Correspondence to Haijin Mou.

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Zhang, T., Li, M., Fu, X. et al. Purification and charicterization of angiotensin I-converting enzyme (ACE) inhibitory peptides with specific structure X-Pro. Eur Food Res Technol 245, 1743–1753 (2019). https://doi.org/10.1007/s00217-019-03290-4

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