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Characterization of ACE Inhibitory Peptides Prepared from Pyropia pseudolinearis Protein

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Title: Characterization of ACE Inhibitory Peptides Prepared from Pyropia pseudolinearis Protein
Authors: Kumagai, Yuya Browse this author
Toji, Keigo Browse this author
Katsukura, Satoshi Browse this author
Morikawa, Rie Browse this author
Uji, Toshiki Browse this author
Yasui, Hajime Browse this author
Shimizu, Takeshi Browse this author
Kishimura, Hideki Browse this author
Keywords: red alga
Pyropia pseudolinearis
Uppurui Nori
ACE inhibitory peptides
docking simulation
Issue Date: Apr-2021
Publisher: MDPI
Journal Title: Marine drugs
Volume: 19
Issue: 4
Start Page: 200
Publisher DOI: 10.3390/md19040200
Abstract: More than 7000 red algae species have been classified. Although most of them are underused, they are a protein-rich marine resource. The hydrolysates of red algal proteins are good candidates for the inhibition of the angiotensin-I-converting enzyme (ACE). The ACE is one of the key factors for cardiovascular disease, and the inhibition of ACE activity is related to the prevention of high blood pressure. To better understand the relationship between the hydrolysates of red algal proteins and the inhibition of ACE activity, we attempted to identify novel ACE inhibitory peptides from Pyropia pseudolinearis. We prepared water soluble proteins (WSP) containing phycoerythrin, phycocyanin, allophycocyanin, and ribulose 1,5-bisphosphate carboxylase/oxygenase. In vitro analysis showed that the thermolysin hydrolysate of the WSP had high ACE inhibitory activity compared to that of WSP. We then identified 42 peptides in the hydrolysate by high-performance liquid chromatography and mass spectrometry. Among 42 peptides, 23 peptides were found in chloroplast proteins. We then synthesized the uncharacterized peptides ARY, YLR, and LRM and measured the ACE inhibitory activity. LRM showed a low IC50 value (0.15 mu mol) compared to ARY and YLR (1.3 and 5.8 mu mol). In silico analysis revealed that the LRM sequence was conserved in cpcA from Bangiales and Florideophyceae, indicating that the novel ACE inhibitory peptide LRM was highly conserved in red algae.
Type: article
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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