pe
pep-04866 v1 CC-BY-SA-4.0

Blood-pressure-lowering peptide (LVYPFP)

A small natural peptide that blocks ACE, the enzyme that raises blood pressure; studied as a potential treatment for high blood pressure, but not an approved drug.

statusbioassayed targetACE length6 aa refs3
angiotensin-converting-enzyme-ace-inhibitorsanti-hypertensive
EARLY ENTRY This candidate is newly indexed — supporting evidence is still being added. Have a paper or data point? Contribute below.
status 2 / 5 · 0 verified on platform
prediction metrics boltz-2 1.0
ipTM0.856
pTM0.568
avg pLDDT90.7
ranking score0.896
STRUCTURE · PEP-04866 × ACE
ranking0.896
target interface 4.5Å peptide drag rotate · ctrl+scroll zoom · right-click pan
boltz-2 1.0 · mmCIF ↓ download
sequence6 aa
156
LVYPFP
Hypotheses7 directions▾ collapse

Research directions for this peptide, selected from the current sources — hypotheses you can explore and model. None of it is proven yet; tap any one to see the full thinking.

openupdated 2026-06-05

Could a single tiny protein fragment from milk hit both the enzyme behind high blood pressure and the enzyme behind high blood sugar?

If this holds, people with metabolic syndrome, where high blood pressure and type 2 diabetes often arrive together, might benefit from a single natural food ingredient instead of two separate drugs. It would not replace medication, but it could open a path to a functional dairy product with dual cardiometabolic support.

The hypothesis
LVYPFP inhibits DPP-IV (dipeptidyl peptidase IV) with biologically relevant potency, making ACE2 a secondary rather than sole cardiovascular target.
Why it’s plausible
The second reference (10.1016/j.foodchem.2017.03.123) is explicitly a DPP-IV inhibitory peptide study using milk protein isolate hydrolysates, and LVYPFP appears in that context. The sequence ends in ...YPFP, where a penultimate aromatic residue (F) and a C-terminal proline match the canonical DPP-IV inhibitor pharmacophore (Xaa-Pro C-terminus). The same structural feature that drives ACE inhibition, namely the C-terminal proline, also satisfies the DPP-IV active site preference. Dual ACE/DPP-IV inhibition by a single casein-derived hexapeptide would mean LVYPFP simultaneously targets two distinct antihypertensive/antidiabetic pathways.
Why it matters
If confirmed, LVYPFP would be a rare naturally occurring dual ACE/DPP-IV inhibitor. This would reframe its therapeutic scope from pure antihypertensive to a combined cardiometabolic agent potentially useful in metabolic syndrome, where hypertension and type 2 diabetes co-occur.
Plausibility.54
Novelty.58
Impact.77
Basis · grounding2 papers · 1 computed/note
[1]
paper
Study characterizing DPP-IV inhibitory peptides from milk protein isolate hydrolysates; LVYPFP appears in this dataset, suggesting it was measured or co-identified in a DPP-IV inhibition context.
doi: 10.1016/j.foodchem.2017.03.123
[2]
sequenceC-terminal ...YFPP motif: F at position 5 and P at position 6 satisfy the Xaa-Pro pharmacophore recognized by DPP-IV active site S1/S2 pockets.
[3]
paper
LVYPFP concentration in B. bifidum fermented milk was about double its ACE IC50, indicating physiologically relevant local concentrations that could also reach DPP-IV in the gut lumen.
doi: 10.1016/j.ijfoodmicro.2013.09.002
openupdated 2026-06-05

Is the blood-pressure-lowering activity of this peptide almost entirely due to a specific rigid shape created by two proline amino acids?

If the double-proline scaffold turns out to be the key, researchers could build smaller, cheaper, and more stable versions that keep the active shape without the full peptide. That could make future natural-origin blood pressure ingredients easier and less costly to develop.

The hypothesis
The double-proline motif (P4 and P6) in LVYPFP creates a rigid C-terminal beta-turn-like conformation that is essential for ACE inhibitory activity, such that substitution of either proline with alanine abolishes more than 80% of inhibitory potency.
Why it’s plausible
Prolines at positions 4 and 6 of a hexapeptide impose backbone rigidity and constrain the phi/psi angles of neighboring residues, particularly F5. This conformational constraint pre-organizes the C-terminal tripeptide FP into a geometry favorable for ACE active site accommodation. In known ACE inhibitor structure-activity relationships, C-terminal proline is near-essential, and a second proline two residues upstream (P4) would further restrict conformational flexibility of the pharmacophoric tail, likely amplifying binding affinity through entropic preorganization. The relatively modest IC50 (about double the detected concentration in fermented milk) could reflect the fact that the rigid conformation is already partially optimized by natural selection during casein evolution.
Why it matters
If the P4-P6 double-proline scaffold is the activity-determining feature, it provides a minimal pharmacophore for engineering more potent analogs by constraining flanking residues (L1, V2, Y3) without requiring the full hexapeptide, potentially reducing the cost and proteolytic vulnerability of derived candidates.
Plausibility.57
Novelty.47
Impact.60
Basis · grounding1 paper · 2 computed/notes
[1]
sequenceProlines at positions 4 and 6: P4 immediately precedes F5 (a known ACE S2-prime contact residue type), and P6 is the terminal zinc-coordinating residue.
[2]
paper
Discusses structure-function relationships for blood-pressure-lowering peptides and notes that amino acid composition and sequence govern antihypertensive activity; positions P and F near C-terminus are highlighted in the field.
doi: 10.1021/jf5002606
[3]
structureHigh avg_plddt of 90.65 despite being a 6-mer suggests the Boltz-2 model assigns well-defined backbone geometry to the peptide in complex, consistent with conformational preorganization.
openupdated 2026-06-05

Does this peptide target just one sub-unit of the blood pressure enzyme ACE, the way some newer prescription drugs do, rather than shutting the whole enzyme down?

Common prescription ACE inhibitors cause a persistent dry cough in roughly one in five people. If LVYPFP only blocks the part of ACE responsible for raising blood pressure, and leaves the other part alone, it might deliver antihypertensive benefit with less cough and fewer unwanted effects. That would be a meaningful advantage for a food-derived ingredient.

The hypothesis
LVYPFP preferentially inhibits the ACE C-domain over the N-domain, giving it a selectivity profile more similar to C-domain-selective synthetic inhibitors (such as trandolaprilat) than to non-selective inhibitors like captopril.
Why it’s plausible
Food-derived ACE inhibitory peptides with C-terminal proline and a bulky penultimate aromatic residue (phenylalanine here) tend to show C-domain preference because the ACE C-domain S2-prime pocket accommodates larger hydrophobic residues. LVYPFP has F at the penultimate position and P at the terminal position, which matches structure-activity patterns associated with C-domain selectivity. C-domain-selective ACE inhibitors preserve N-domain-mediated N-acetyl-seryl-aspartyl-lysyl-proline (AcSDKP) metabolism, potentially reducing fibrotic side effects seen with pan-ACE inhibitors.
Why it matters
C-domain selectivity would differentiate LVYPFP from most food-derived ACE inhibitors that are non-selective, suggesting it could be developed as a nutraceutical or pharmaceutical with a reduced cough side-effect burden (which is partly bradykinin-mediated via the C-domain) or reduced risk of AcSDKP accumulation-related anti-fibrotic activity loss.
Plausibility.48
Novelty.57
Impact.64
Basis · grounding1 paper · 2 computed/notes
[1]
sequenceF at position 5 (penultimate, bulky aromatic) and P at position 6 (terminal) match the structural motif associated with ACE C-domain S2-prime pocket preference.
[2]
structureBoltz-2 ipTM 0.856 with the annotated ACE target; the quality of the interface is consistent with a specific domain-selective interaction rather than a promiscuous low-affinity contact.
[3]
paper
Notes that ethnic differences and cis/trans peptide bond conformations affect antihypertensive peptide outcomes in clinical settings, implying the binding mode details matter for development.
doi: 10.1021/acs.jafc.8b02603
openupdated 2026-06-05

If you flip just the first building block of this peptide into its mirror-image form, does it last three times longer in blood without losing its activity?

Most food peptides break down quickly in blood before they can do anything useful. If a single stereochemical swap at one end of the molecule extends survival without touching the active part, it could transform a fragile food compound into a practical nutraceutical or pharmaceutical lead, at minimal added cost or complexity.

The hypothesis
Replacing leucine at position 1 with a D-leucine stereoisomer in LVYPFP increases its proteolytic half-life in serum by at least three-fold without substantially reducing ACE inhibitory potency, because the N-terminal residue is remote from the ACE zinc-binding C-terminal pharmacophore.
Why it’s plausible
The axis-hits for proteolytic-stability cite literature confirming that D-amino acid substitution at positions distal to the binding pharmacophore improves serum stability while preserving target affinity. In LVYPFP, the ACE inhibitory pharmacophore is concentrated at the C-terminal FP (and to a lesser extent Y), while L1 and V2 are likely involved in binding affinity optimization but are not the direct zinc-coordinating or S1/S2-prime contact residues. A D-Leu1 substitution would therefore be expected to block aminopeptidase cleavage at the N-terminus without disrupting the bioactive C-terminal conformation enforced by the double-proline scaffold.
Why it matters
A single stereochemical modification at L1 would represent the minimal structural change needed to address the main pharmacokinetic liability of LVYPFP (rapid N-terminal proteolysis) while preserving its natural origin story (only one non-natural residue). This would make D-Leu1-LVYPFP an attractive lead for nutraceutical or pharmaceutical development.
Plausibility.58
Novelty.42
Impact.55
Basis · grounding1 paper · 2 computed/notes
[1]
sourceD-amino acid substitution is established to improve proteolytic stability in serum and inhibit enzymatic recognition by endogenous proteases.
[2]
sequenceL1 is the N-terminal residue; N-terminal aminopeptidase cleavage is a primary degradation route for small peptides. L1 is structurally distal from the C-terminal FP pharmacophore (positions 5-6).
[3]
paper
Establishes that ACE inhibitory peptides must reach the cardiovascular system in active form; proteolytic stability is therefore the rate-limiting factor for in vivo potency.
doi: 10.1079/bjn20041189
openupdated 2026-06-05

Is there already enough of this peptide in B. bifidum fermented milk to actually lower blood pressure in people with mildly elevated readings?

If a clinical study confirmed this, fermented dairy products could be positioned as a genuine dietary tool for stage-1 hypertension, something people could reach for without a prescription. Because fermented milk has a centuries-long safety record, the development pathway would be far shorter and cheaper than a drug.

The hypothesis
LVYPFP delivered as a component of fermented dairy food (not as an isolated drug) achieves sufficient portal and systemic ACE inhibitory concentrations to produce a clinically measurable reduction in systolic blood pressure in stage-1 hypertensive humans, because its concentration in B. bifidum-fermented milk already exceeds its IC50 by approximately two-fold before gastrointestinal dilution.
Why it’s plausible
The B. bifidum fermentation study documents that LVYPFP concentration in the milk fraction is about double its IC50, which is a higher margin than typical food-derived ACE inhibitors require for in vivo efficacy (IPP and VPP, the best-characterized, are at 10-fold their IC50 in fermented milk and are clinically validated). Although LVYPFP is at a smaller multiple, small food-derived hexapeptides with two prolines show partial resistance to gastrointestinal proteolysis (proline-rich sequences are poor substrates for many gut proteases), and low-molecular-weight peptides can retain activity after digestion as noted in the axis-hits. A food-matrix delivery vehicle may improve bioavailability compared to isolated peptide administration.
Why it matters
Demonstrating in vivo antihypertensive efficacy via dietary delivery would establish LVYPFP as a functional food ingredient requiring no drug approval pathway, with a safety profile derived from centuries of fermented dairy consumption. This would make it actionable at a much lower development cost than a pharmaceutical route.
Plausibility.43
Novelty.43
Impact.73
Basis · grounding2 papers · 1 computed/note
[1]
paper
Concentration of LVYPFP in B. bifidum fermented milk fraction is about double its ACE IC50, establishing that the bioactive concentration is achieved in the food matrix.
doi: 10.1016/j.ijfoodmicro.2013.09.002
[2]
paper
Notes that low-molecular-weight peptides can retain bioactivity during gastrointestinal digestion, supporting that LVYPFP's small size is an advantage for oral delivery.
doi: 10.1038/s41598-021-84820-7
[3]
sourceVPP and IPP have demonstrated significant blood pressure reductions in clinical trials; LVYPFP shares structural features (casein origin, C-terminal proline, fermented-dairy source) with these validated peptides.
openupdated 2026-06-05

Could this peptide also inhibit the enzyme that breaks down heart-protective hormones, the same dual-action mechanism behind the drug Entresto?

Entresto is one of the most effective heart-failure drugs approved in decades, and it works by blocking two enzymes simultaneously. If LVYPFP does the same thing naturally, it could open a genuinely new line of research into food-derived support for heart failure, not just blood pressure. This is a speculative but high-upside hypothesis worth testing.

The hypothesis
LVYPFP inhibits neprilysin (NEP, CD10), an endopeptidase that degrades natriuretic peptides and shares structural similarity with ACE in its zinc-metalloprotease active site, enabling a dual ACE/NEP inhibition profile analogous to sacubitril-based therapy but from a naturally occurring food peptide.
Why it’s plausible
ACE and NEP are both zinc-dependent metallopeptidases with overlapping substrate pharmacophores. Several synthetic ACE inhibitors and their structural analogs also inhibit NEP; this cross-reactivity is the pharmacological basis of the approved drug sacubitril/valsartan (Entresto). The C-terminal proline zinc-chelating motif in LVYPFP, combined with the hydrophobic FP tail fitting NEP's large S1 pocket (which accommodates bulky aromatic residues), makes NEP inhibition plausible for this peptide. The tyrosine at position 3 could additionally occupy NEP's S2 subsite. If LVYPFP inhibits both ACE and NEP, it would simultaneously reduce angiotensin II production and prevent natriuretic peptide degradation, achieving dual blood pressure lowering and cardioprotective effects.
Why it matters
A food-derived dual ACE/NEP inhibitor would recapitulate the mechanism of a blockbuster cardiovascular drug class using a bioactive peptide accessible through dietary fermentation. This would represent a genuinely novel repurposing hypothesis with implications for heart failure as well as hypertension, extending LVYPFP's therapeutic scope far beyond its current annotation.
Plausibility.34
Novelty.67
Impact.70
Basis · grounding1 paper · 2 computed/notes
[1]
sequenceC-terminal proline (zinc chelation) and phenylalanine at penultimate position (S1 pocket occupancy) are structural features shared by NEP inhibitors such as candoxatrilat and thiorphan analogs.
[2]
paper
Notes that antihypertensive peptides function in the cardiovascular, endocrine, immune, and nervous systems; the NEP pathway is a cardinal cardiovascular regulatory axis distinct from the one currently annotated.
doi: 10.1016/j.foodchem.2012.08.080
[3]
structureHigh ipTM (0.856) suggests a well-defined zinc-metalloprotease binding interface; NEP has a homologous active site architecture to ACE, so the predicted ACE complex geometry may translate to NEP binding.
openupdated 2026-06-05

Do we know the precise physical handshake between this peptide and the blood pressure enzyme it targets, and does that tell us anything useful about safety?

Understanding exactly how a molecule grabs its target, and which part of the enzyme it locks onto, helps predict side effects and guides smarter design of follow-on compounds. If the model is confirmed experimentally, it would give researchers a clear blueprint for improving the peptide or predicting how it differs from prescription ACE inhibitors in everyday use.

The hypothesis
LVYPFP acts as a competitive inhibitor of ACE by occupying the C-domain active site in a substrate-mimetic binding mode driven by the C-terminal proline coordinating the zinc ion, while the internal tyrosine (Y3) forms a hydrogen bond with Glu403 of ACE.
Why it’s plausible
The high interface confidence (ipTM 0.856) from the Boltz-2 complex prediction, combined with the known structural pharmacology of ACE C-domain inhibitors, supports a well-defined binding pose. ACE C-domain selectivity is governed by S2-prime subsite contacts; the P-F-P tripeptide at the C-terminus is geometrically suited to extend into the zinc-coordinating active site. The tyrosine at position 3, bearing a hydroxyl group, is positioned to form a polar contact with conserved glutamate residues lining the ACE active site cleft, analogous to the tyrosine contacts observed in lisinopril-ACE crystal structures.
Why it matters
Establishing whether LVYPFP is a zinc-chelating versus non-zinc-chelating inhibitor, and whether it is C-domain selective, determines its potential for preserving bradykinin degradation (C-domain function) differently from N-domain-selective inhibitors, which would have distinct side-effect profiles relative to synthetic ACE inhibitors.
Plausibility.46
Novelty.33
Impact.57
Basis · grounding1 paper · 2 computed/notes
[1]
structureipTM 0.856 indicates a high-confidence interface with ACE in the Boltz-2 complex prediction, supporting a stable and specific binding pose.
[2]
sequenceC-terminal proline (P6) is the canonical zinc-coordinating pharmacophore; Y3 hydroxyl is available for H-bond donation to active site residues.
[3]
paper
States that ACE inhibitory peptides must reach the cardiovascular system in active form to lower blood pressure, implying mechanism at ACE is the operative one in vivo.
doi: 10.1079/bjn20041189
details expand to inspect
full evidence table2 metrics
metricvaluetool
ipTM 0.8558291792869568 boltz-2
ranking score 0.8963732123374939 boltz-2
structural qualityopenfold3
metricvaluenote
gpde1.014global PDE — lower = better
disorderNaNfraction disordered
3-letter notation
Leu-Val-Tyr-Pro-Phe-Pro
recipeboltz-2 1.0
parametervalue
modelboltz-2 1.0
weights
hardwarenvidia_nim_api
mlx version
python
random seed
msa strategynone
diffusion samples1
runtime
predicted bymlx@peptide
predicted at2026-04-24
citationbibtex
peptidemodel (2026). Blood-pressure-lowering peptide (LVYPFP) (pep-04866, v1). PeptideModel. https://peptidemodel.com/card/pep-04866
@peptide{pep04866,
  sequence = {LVYPFP},
  target   = {ace},
  author   = {peptidemodel},
  year     = {2026},
  status   = {bioassayed}
}
related peptides 5 by signal overlap
references 3 papers
discussion no comments
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