Beta · in development. A research-use sequence property calculator. Property values are estimates — cross-check before relying on them. Prefer a hands-on, gamified build? Try PeptideForge.
Peptide Design Lab
Build a sequence, paste one, or load a catalog peptide — then read molecular weight, pH-dependent net charge, isoelectric point, GRAVY, and the 280 nm extinction coefficient in real time.
Sequence
pH environment
pH 7.4Length
15
residues
Molecular weight
1,419.55
Da (avg)
Net charge @ pH 7.4
-2
e
Isoelectric point
3.55
pI
GRAVY
-0.69
hydropathy
Extinction ε₂₈₀
0
M⁻¹·cm⁻¹ (reduced)
A280 (0.1%)
0
1 g/L
Aromatic
0
F/W/Y/H
Cysteines
0
thiols
Composition
Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val
Synthesis difficulty
moderate- Moderate length. 15 residues — more coupling cycles than a short peptide; per-cycle losses compound.
- Proline-rich. High proline content can slow couplings and complicate folding.
- Repeat run. Three or more identical residues in a row can be harder to couple cleanly.
Heuristic estimate from sequence — see the synthesis guide for what drives cost & purity.
AI design analysis
Get a research-framed read on this sequence — charge & solubility, stability & synthesis liabilities, and similar known peptides. Not medical, dosing, or administration advice.
3D structure
Predict a 3D structure for this sequence.
Structure predicted with ESMFold (Meta) — a computational prediction, not an experimental structure. For larger or higher-confidence models, use AlphaFold Server below.
From design to bench
- Define goal
- Predict propertiesyou are here
- 3D structure
- Optimize sequence
- Validate folding
- Lab synthesis
AlphaFold Server
3D structure prediction
RFdiffusion
De novo backbone design
ProteinMPNN
Inverse folding / sequence design
ExPASy ProtParam
Independent property cross-check
External research tools open in a new tab. AmericanPeptide is not affiliated with and does not endorse these services.
Research use only. Computed properties are estimates for educational/research reference, not medical advice or an offer for sale. Validate independently.