2 research outputs found
Graphitized Porous Carbon for Rapid Screening of Angiotensin-Converting Enzyme Inhibitory Peptide GAMVVH from Silkworm Pupa Protein and Molecular Insight into Inhibition Mechanism
A novel hydrophobic hexapeptide with
high angiotensin-converting
enzyme (ACE) inhibitory activity was screened from silkworm pupa protein
(SPP) hydrolysate via graphitized porous carbon and reverse-phase
high-performance liquid chromatography methods. Graphitized porous
carbon derived from dopamine, possessing high surface area and high
graphitic carbon, was used to rapidly screen and enrich hydrophobic
peptides from SPP hydrolysate. The ACE inhibition pattern and mechanism
of the purified peptide were also systematically studied by the classic
Lineweaver–Burk model and by molecular docking/dynamic simulation.
The novel hydrophobic hexapeptide was identified as Gly-Ala-Met-Val-Val-His
(GAMVVH, IC<sub>50</sub> = 19.39 ± 0.21 μM) with good thermal/antidigestive
stabilities. Lineweaver–Burk plots revealed that GAMVVH behaved
as a competitive ACE inhibitor. It formed hydrogen bonds with S1 and
S2 pockets of ACE and established competitive coordination with ZnÂ(II)
of ACE. The synergy of hydrogen bonds with active pockets and ZnÂ(II)
coordination efficiently changed the three-dimensional structure of
ACE and thus inhibited bioactivity of ACE
High-Throughput and Rapid Screening of Novel ACE Inhibitory Peptides from Sericin Source and Inhibition Mechanism by Using in Silico and in Vitro Prescriptions
Several
novel peptides with high ACE-I inhibitory activity were
successfully screened from sericin hydrolysate (SH) by coupling in
silico and in vitro approaches for the first time. Most screening
processes for ACE-I inhibitory peptides were achieved through high-throughput
in silico simulation followed by in vitro verification. QSAR model
based predicted results indicated that the ACE-I inhibitory activity
of these SH peptides and six chosen peptides exhibited moderate high
ACE-I inhibitory activities (log IC<sub>50</sub> values: 1.63–2.34).
Moreover, two tripeptides among the chosen six peptides were selected
for ACE-I inhibition mechanism analysis which based on Lineweaver–Burk
plots indicated that they behave as competitive ACE-I inhibitors. The C-terminal residues
of short-chain peptides that contain more H-bond acceptor groups could
easily form hydrogen bonds with ACE-I and have higher ACE-I inhibitory
activity. Overall, sericin protein as a strong ACE-I inhibition source
could be deemed a promising agent for antihypertension applications