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List of peptide properties
DFBP ID - DFBPAGPE0027(Alpha-gliadin peptide)
DFBP ID DFBPAGPE0027
Peptide sequence PSQQQPQEQVPL
Type Native peptide
Peptide/Function name α-Gliadin peptide A3
Function-activity relationship
Main bioactivity

Inhibitory activity of gliadin bonding with AGA

Otheir bioactivity N.D
Calculated physicochemical properties
Three-letter amino acid Pro-Ser-Gln-Gln-Gln-Pro-Gln-Glu-Gln-Val-Pro-Leu
Single-letter amino acid PSQQQPQEQVPL
Peptide length 12
Peptide mass
Experimental mass Theoretical mass
1378.4950 Da 1378.51 Da c
Net charge 0.00 c
Isoelectric point (pI) 3.34 c
IC50 N.D
pIC50 N.D
GRAVY -1.5500 c
Hydrophilic residue ratio 41.67% c
Peptide calculator
To calculate the physicochemical properties of bioactive peptide.
Peptide source & Food-borne protein(s) search
Classification Plant
Organism/Source Wheat gluten
Precursor protein α-Gliadin
Residue position N.D
Precursor protein(s) search
Source.1: DFBPPR0379 ---- Plant protein ---- Alpha-gliadin
Source.2: DFBPPR0380 ---- Plant protein ---- Alpha-gliadin
Source.3: DFBPPR0381 ---- Plant protein ---- Alpha-gliadin
Source.4: DFBPPR0382 ---- Plant protein ---- Alpha-gliadin
Source.5: DFBPPR0383 ---- Plant protein ---- Alpha-gliadin
Source.6: DFBPPR0384 ---- Plant protein ---- Alpha-gliadin
Source.7: DFBPPR0385 ---- Plant protein ---- Alpha-gliadin
Source.8: DFBPPR0389 ---- Plant protein ---- Alpha-gliadin
Source.9: DFBPPR0390 ---- Plant protein ---- B3144=ALPHA-gliadin derived CELIAC active peptide
Source.10: DFBPPR0391 ---- Plant protein ---- B3143=ALPHA-gliadin derived CELIAC active peptide
Source.11: DFBPPR6853 ---- Plant proteins ---- Alpha/beta-gliadin MM1
Source.12: DFBPPR6930 ---- Plant proteins ---- Alpha/beta-gliadin
Source.13: DFBPPR6936 ---- Plant proteins ---- Alpha/beta-gliadin A-II
Source.14: DFBPPR6938 ---- Plant proteins ---- Alpha/beta-gliadin clone PW8142
Source.15: DFBPPR6939 ---- Plant proteins ---- Alpha/beta-gliadin A-V
Source.16: DFBPPR6940 ---- Plant proteins ---- Alpha/beta-gliadin A-III
Source.17: DFBPPR6941 ---- Plant proteins ---- Alpha/beta-gliadin A-I
Link-research
There are no literature reports on the discovery of this sequence in other food-source proteins.
Biological/Functional activity & target protein
Coeliac toxic activity

Sera of patients with coeliac disease, containing IgA and IgG antigliadin antibodies (AGA) and various IgA autoantibodies , react with isolated enterocytes. This peptide A3 (PSQQQPQEQVPL) showed the inhibition effection on the binding of gliadin with AGA. But the peptide A3 did not show significantly inhibiton on AGA cross reactivity with enteroctyes and calreticulin.

Specific target protein(s) N.D
Taste properties & Structure
Bitterness
Literature report N.D
Bitter prediction tools Non-bitter taste prediction
SMILES N1[C@@]([H])(CCC1)C(=O)N[C@@]([H])(CO)C(=O)N[C@@]([H])(CCC(=O)N)C(=O)N[C@@]([H])(CCC(=O)N)C(=O)N[C@@]([H])(CCC(=O)N)C(=O)N1[C@@]([H])(CCC1)C(=O)N[C@@]([H])(CCC(=O)N)C(=O)N[C@@]([H])(CCC(=O)O)C(=O)N[C@@]([H])(CCC(=O)N)C(=O)N[C@@]([H])(C(C)C)C(=O)N1[C@@]([H])(CCC1)C(=O)N[C@@]([H])(CC(C)C)C(=O)O
Preparation method
Mode of preparation

Synthesis peptide

Enzyme(s)/starter culture

The peptide was synthesised using the Fmoc/tBu protection strategy on aminomethyl copoly (styrene-1% divinylbenzene) resin with a Knorr linker.

Stability & Cytotoxicity
Peptide stability
Literature report: N.D
EHP-Tool: Enzymatic Hydrolysis Prediction Tool (EHP-Tool)
Peptide cytotoxicity
Literature report: N.D
Prediction: ToxinPred
Additional information
Additional information

(1) Coeliac disease is a permanent intolerance to the gluten or storage proteins found in some cereals. According to De Ritis and coworkers, small sequences of amino acids are common to the peptides linked with the toxicity. It has also been suggested that Tyr-containing motif is also associated with toxicity [D1].
(2) Coeliac disease has many similarities with autoimmune system. Sera of patients with coeliac contain high concentration of antibodies to gliadin [D1].
(3) AGA of patients with coeliac disease react with similar structures on gliadin and potential autoantigens on enterocytes [0].

Database cross-references
BIOPEP-UWM [D1] 7002
APD [D2] -
BioPepDB [D3] -
MBPDB [D4] -
Reference(s)
Primary literature Krupicková S, Tucková L, Flegelová Z, Michalak M, Walters JR, Whelan A, Harries J, Vencovský J, Tlaskalová-Hogenová H. Identification of common epitopes on gliadin, enterocytes, and calreticulin recognised by antigliadin antibodies of patients with coeliac disease. Gut. 1999 Feb;44(2):168-73.
PMID: 9895374
Other literature(s) N.D
PubDate 1999
Copyright © 2020. Record / license number: Chongqing ICP No. 2000214