pe
pep-04730 v1 CC-BY-SA-4.0

Blood-pressure-lowering peptide (FVAPFPEV)

A small peptide that blocks ACE, the enzyme that raises blood pressure, helping to lower it; used only as a lab research tool.

statusbioassayed targetACE length8 aa refs14
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
ipTM0.580
pTM0.714
avg pLDDT85.1
ranking score0.797
STRUCTURE · PEP-04730 × ACE
ranking0.797
target interface 4.5Å peptide drag rotate · ctrl+scroll zoom · right-click pan
boltz-2 1.0 · mmCIF ↓ download
sequence8 aa
158
FVAPFPEV
Hypotheses6 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

Why would a slightly longer version of a helpful peptide work worse than the shorter one?

If this holds, it tells researchers exactly where to stop when building peptides that lower blood pressure, so they don't waste effort making fragments that are longer but weaker. It could help narrow the design space for future food-derived blood pressure supplements.

The hypothesis
The C-terminal valine in FVAPFPEV reduces ACE inhibitory potency relative to the 7-mer FVAPFPE by sterically displacing the terminal carboxylate from the Zn2+ coordination geometry of the ACE active site.
Why it’s plausible
The literature identifies FVAPFPE (7-mer) as the minimal ACE-inhibitory motif within alphaS1-casein. The 8-mer FVAPFPEV extends this by a C-terminal Val. In ACE, the C-terminal carboxylate of a substrate or inhibitor coordinates the catalytic zinc ion through a bridging water molecule. Adding a residue shifts the terminal carboxylate one position further from the proline anchor, potentially misaligning it with the zinc. This would make FVAPFPEV less potent than FVAPFPE, not more, despite being a longer fragment.
Why it matters
If confirmed, this establishes that C-terminal elongation beyond Pro7 is counterproductive for this scaffold, focusing optimization efforts on N-terminal extensions and sidechain modifications rather than C-terminal additions, which has direct implications for semi-synthetic derivative design.
Plausibility.71
Novelty.52
Impact.68
Basis · grounding2 papers · 1 computed/note
[1]
paper
Explicitly defines FVAPFPE (7-mer) as a core ACE-inhibitory sequence and also identifies the 8-mer FVAPFPEV in longer precursor fragments; no direct IC50 comparison is presented
doi: 10.1021/jf049510t
[2]
paper
Reviews structure-activity relationships of food-derived ACE inhibitors, noting that C-terminal residue identity is critical for potency
doi: 10.1021/acs.jafc.8b02603
[3]
sequenceFVAPFPEV is 8 residues; 7-mer FVAPFPE is the named minimal motif in the same literature; the additional C-terminal Val may perturb zinc coordination geometry
openupdated 2026-06-05

Could a milk-derived peptide lower blood pressure without causing the nagging dry cough that many blood pressure drugs do?

Common ACE-inhibitor drugs cause a persistent dry cough in roughly one in five patients because they affect a specific branch of the enzyme. If this peptide works on a different branch, it might lower blood pressure without that side effect, which could make it a more tolerable option for people who cannot take standard medications.

The hypothesis
FVAPFPEV preferentially inhibits the N-domain of ACE rather than the C-domain, exploiting the N-domain's tolerance for bulky hydrophobic P1' residues and its distinct S2' subsite architecture.
Why it’s plausible
The sequence is entirely hydrophobic and proline-rich (FVAPFPEV) with no basic residues at the C-terminus, which contrasts with canonical C-domain-selective inhibitors that rely on a C-terminal carboxylate anchored by Lys511/His353. The N-domain of ACE (encoded by the same ACE gene but with a distinct active-site topology around Glu389) accommodates hydrophobic substrates more readily. The Boltz-2 iPTM of 0.58 for the annotated ACE complex is only moderate, consistent with the possibility that the modeled complex defaulted to the more commonly studied C-domain but the true high-affinity binding occurs at the N-domain.
Why it matters
ACE N-domain-selective inhibitors do not suppress bradykinin metabolism (which is predominantly C-domain-dependent) and are therefore predicted to avoid the dry-cough side effect that limits synthetic ACE inhibitors; confirming N-domain selectivity would reframe FVAPFPEV as a potentially safer antihypertensive scaffold.
Plausibility.55
Novelty.65
Impact.82
Basis · grounding1 paper · 2 computed/notes
[1]
structureiPTM 0.58 for the ACE complex is only moderate, suggesting the modeled docking pose may not represent the highest-affinity binding site
[2]
paper
Discusses N- vs C-domain differences in ACE inhibitor selectivity and their relation to side-effect profiles including cough
doi: 10.1021/acs.jafc.8b02603
[3]
sequenceFVAPFPEV contains no basic or aromatic C-terminal residue typical of high-affinity C-domain binders; the C-terminal Val is small and hydrophobic
openupdated 2026-06-05

Can a single change to one building block of a peptide stop your body from breaking it down before it can work?

Most short peptides from food get destroyed in the blood within minutes. If swapping one standard amino acid for a slightly bulkier version stiffens the molecule enough to survive, it could turn a fragile dietary compound into something that behaves more like a real drug, with predictable dosing and lasting effect.

The hypothesis
Replacing Ala3 in FVAPFPEV with alpha-aminoisobutyric acid (Aib) rigidifies the backbone turn between the two prolines and increases metabolic stability in plasma without substantially disrupting ACE binding.
Why it’s plausible
The sequence FVA-P-FP-EV contains Ala at position 3 immediately preceding Pro4, forming a beta-turn-like structure. Aib (alpha-methylalanine) at this position would lock the phi/psi angles, reduce conformational entropy, and sterically protect the adjacent peptide bond from endoprotease cleavage. The proteolytic-stability axis hits (10.1248/cpb.c25-00478) confirm that backbone rigidification via unnatural residues improves plasma stability of short peptides. Since ACE's active site is relatively open and tolerates non-proteinogenic residues in food-derived inhibitors, Aib substitution at position 3 is unlikely to abrogate binding.
Why it matters
A single Aib substitution at position 3 could convert FVAPFPEV from a food-grade, rapidly degraded peptide into a plasma-stable drug candidate suitable for oral formulation with predictable pharmacokinetics.
Plausibility.61
Novelty.52
Impact.67
Basis · grounding1 paper · 2 computed/notes
[1]
sourceDemonstrates that backbone methylation (D-amino acid or alpha-methyl substitution) improves proteolytic stability in serum for short peptides
[2]
paper
Reviews general strategies for converting food-derived peptides into stable oral drugs, including backbone modification
doi: 10.1038/s41392-024-02107-5
[3]
sequenceAla at position 3 (FVAPFPEV) is an ideal Aib substitution site: the methyl sidechain is retained, and the flanking Pro4 already constrains phi angle, meaning Aib would complete a conformational lock
openupdated 2026-06-05

Could a peptide that blocks a blood pressure enzyme also protect the kidneys from slowly scarring over time?

Chronic kidney disease often progresses through scarring driven by local enzyme activity inside the kidney, not just by high blood pressure. If this peptide reaches the kidney and damps that process, it might slow disease in people with early kidney damage even before they develop hypertension, which is a much larger and harder-to-treat group.

The hypothesis
FVAPFPEV exerts anti-fibrotic activity in the kidney by suppressing ACE-mediated angiotensin II generation locally in renal tubular cells, slowing TGF-beta-driven fibrosis independently of systemic blood pressure reduction.
Why it’s plausible
Intrarenal ACE activity drives local angiotensin II production that activates AT1 receptors on tubular cells, triggering TGF-beta1 secretion and progressive interstitial fibrosis independent of systemic hypertension. Food-derived ACE inhibitor peptides that survive gut passage and reach renal concentrations could therefore act as anti-fibrotic agents even in normotensive or pre-hypertensive individuals with early chronic kidney disease. The peptide's small size (8 residues, MW ~920 Da) and moderate hydrophobicity suggest renal filtration and tubular exposure are plausible.
Why it matters
This would open a disease indication entirely distinct from hypertension, targeting CKD progression, and could justify dosing regimens that are tolerated without causing systemic hypotension.
Plausibility.43
Novelty.62
Impact.70
Basis · grounding1 paper · 2 computed/notes
[1]
sourceReview notes ACE inhibitors' nephroprotective effects beyond blood pressure, mentioning intrarenal angiotensin II as a driver of renal injury
[2]
paper
Discusses natural antihypertensive peptides as emerging therapeutics with potential for organ-protective effects beyond blood pressure
doi: 10.13005/bbra/3410
[3]
sequenceOctapeptide of ~920 Da; small enough for glomerular filtration and tubular reabsorption/luminal exposure
openupdated 2026-06-05

What if one food-derived peptide could do the job of two separate drugs that together form a leading heart-failure treatment?

A drug combination that blocks both ACE and neprilysin is already one of the most effective heart-failure treatments available. If this milk peptide turns out to inhibit both enzymes even partially, it could serve as a natural template for developing a single food-based compound with broader cardiovascular benefit, potentially useful for both high blood pressure and heart failure.

The hypothesis
FVAPFPEV inhibits neprilysin (NEP/CD10) in addition to ACE, producing additive natriuretic peptide preservation that enhances antihypertensive efficacy beyond ACE inhibition alone.
Why it’s plausible
Neprilysin degrades ANP, BNP, and bradykinin, all vasodilatory peptides. The dual ACE/NEP inhibitor strategy (sacubitril + valsartan) is now a validated approach in heart failure. Neprilysin's active site also has a preference for hydrophobic residues at P1 and accommodates proline-containing peptides. FVAPFPEV's hydrophobic, proline-flanked structure (Phe-Val-Ala-Pro-Phe-Pro) is structurally similar to known NEP substrates and weak NEP inhibitors identified from food proteins. The moderate ACE iPTM in the Boltz-2 prediction (0.58) leaves open the possibility that the primary in vivo target is a different metallopeptidase.
Why it matters
Confirming dual ACE/NEP activity would position FVAPFPEV as a natural-product template for a food-derived sacubitril analog, with potential applications in both hypertension and heart failure with reduced ejection fraction.
Plausibility.43
Novelty.58
Impact.73
Basis · grounding1 paper · 2 computed/notes
[1]
structureBoltz-2 iPTM of 0.58 for ACE complex; moderate confidence leaves open alternative metallopeptidase targets
[2]
paper
Review discusses dual ACE/NEP inhibition as a relevant antihypertensive mechanism; notes structural overlap between ACE and NEP substrate preferences
doi: 10.1021/acs.jafc.8b02603
[3]
sequenceHydrophobic Phe-Pro-Phe core (positions 1, 4, 5 in FVAPFPEV) is consistent with neprilysin's S1 hydrophobic pocket requirements
openupdated 2026-06-05

Could the reason food peptides sometimes work better in real life than in a lab dish be that they also shift the gut microbiome in a helpful direction?

Gut bacteria that feed on proline-rich fragments can produce short-chain fatty acids, which have their own independent blood-pressure-lowering effect. If this peptide nudges the microbiome that way, it would explain why casein-derived peptides often outperform what their lab measurements predict, and it could point toward combining them with specific dietary fibers to get a stronger, more reliable effect.

The hypothesis
Oral administration of FVAPFPEV reshapes the gut microbiome in a direction that amplifies its antihypertensive effect beyond direct ACE inhibition, through microbiota-dependent production of short-chain fatty acids that independently lower blood pressure via GPR41/GPR43 signaling.
Why it’s plausible
A 2025 randomized double-blind trial (10.1038/s41598-025-98446-6) directly shows that an ACE-inhibitory casein peptide lowers blood pressure AND reshapes gut microbiota. Proline-rich peptides are partially resistant to luminal proteolysis and reach the colon where they can serve as substrates or modulators for specific microbes. Short-chain fatty acids produced by colonic fermentation activate GPR41 and GPR43 on enteroendocrine cells and vascular smooth muscle, lowering blood pressure by a mechanism completely independent of ACE. FVAPFPEV's hydrophobic, proline-rich character predicts partial colonic survival.
Why it matters
A dual mechanism (direct ACE inhibition plus microbiome-mediated SCFA signaling) would explain why food-derived casein peptides often show in vivo antihypertensive effects disproportionate to their moderate in vitro IC50 values, and would justify dietary/prebiotic co-formulation strategies.
Plausibility.43
Novelty.45
Impact.57
Basis · grounding2 papers · 1 computed/note
[1]
paper
Randomized controlled trial demonstrates that ACE-inhibitory casein peptide administration alters gut bacterial composition alongside blood pressure reduction
doi: 10.1038/s41598-025-98446-6
[2]
paper
Notes that ACE inhibitory peptides must reach the cardiovascular system in active form, implying partial survival through the GI tract
doi: 10.1079/bjn20041189
[3]
sequenceTwo Pro residues confer resistance to proline-specific endoproteases and may allow partial passage to the colon intact
details expand to inspect
full evidence table2 metrics
metricvaluetool
ipTM 0.5797842741012573 boltz-2
ranking score 0.7965718507766724 boltz-2
3-letter notation
Phe-Val-Ala-Pro-Phe-Pro-Glu-Val
recipeboltz-2 1.0
parametervalue
modelboltz-2 1.0
weights
hardwarenvidia_nim_api
mlx version
python
random seed
msa strategycolabfold_nvidia
diffusion samples1
runtime
predicted bymlx@peptide
predicted at2026-04-25
citationbibtex
peptidemodel (2026). Blood-pressure-lowering peptide (FVAPFPEV) (pep-04730, v1). PeptideModel. https://peptidemodel.com/card/pep-04730
@peptide{pep04730,
  sequence = {FVAPFPEV},
  target   = {ace},
  author   = {peptidemodel},
  year     = {2026},
  status   = {bioassayed}
}
related peptides 5 by signal overlap
references 14 papers
[1]
Peptidomic analysis reveals proteolytic activity of kefir microorganisms on bovine milk proteins
Dallas D; Citerne F; Tian T; Silva V; Kalanetra K; Frese S; Robinson R; Mills D; Barile D Food Chemistry 2016
source scaffold
[6]
Critical Review and Perspectives on Food-Derived Antihypertensive Peptides
Miralles, B. et al. Journal of Agricultural and Food Chemistry 2018
supporting
[12] supporting
[13] supporting
discussion no comments
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