Virtual screening for angiotensin I-converting enzyme inhibitory peptides from Phascolosoma esculenta

Abstract

Background

Many short peptides have proved to exhibit potential anti-hypertensive activity through the inhibition of the Angiotensin I-converting enzyme (ACE) activity and the regulation of blood pressure. However, the traditional experimental screening method for ACE inhibitory peptides is time consuming and costly, accompanied with the limitations as incomplete hydrolysis and peptides loss during purification process. Virtual methods with the aid of computer can break such bottle-neck of experimental work. In this study, an attempt was made to establish a library of di- and tri-peptides derived from proteins of Phascolosoma esculenta, a kind of seafood, through BIOPEP (http://www.uwm.edu.pl/biochemia/index.php/pl/biopep), and to screen highly active ACE inhibitory peptides by molecular docking with the help of LibDock module of Discovery Studio 3.5 software.

Results

Two hundred and eighty four (284) di- and tri-peptides, derived from P. esculenta proteins after a virtual hydrolysis with pepsin, trypsin and a mixture of pepsin and trypsin, were predicted to possess ACE inhibitory activity, among which there are 99 ACE inhibitory peptides with estimated IC₅₀ less than 50 μM. Nine peptides were synthesized for the comparison between the estimated and the experimentally determined IC₅₀. The results indicated that errors between the estimated and measured log(1/IC₅₀) are all less than 1.0 unit.

Conclusions

Virtual method for peptide library construction and ACE inhibitory peptides screening efficiently demonstrated that P. esculenta proteins are prospect resource for food-origin ACE inhibitory peptide.

Keywords

Virtual screening / Angiotensin I-converting enzyme (ACE) / ACE inhibitory peptide / Phascolosoma esculenta

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