Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5549
Number of amino acids:221
Molecular Weight:23745.29 Da
Theoretical pI:5.88


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)188.14%
Cysteine CYS (C)20.9%
Glutamic Acid GLU (E)41.81%
Aspartic Acid ASP (D)146.33%
Glycine GLY (G)156.79%
Phynylalanine PHE (F)146.33%
Isoleucine ILE (I)177.69%
Histidine HIS (H)31.36%
Lysine LYS (K)135.88%
Methionine MET (M)31.36%
Leucine LEU (L)188.14%
Asparagine ASN (N)188.14%
Glutamine GLN (Q)114.98%
Proline PRO (P)156.79%
Serine SER (S)135.88%
Arginine ARG (R)31.36%
Threonine THR (T)125.43%
Tryptophan TRP (W)00%
Valine VAL (V)2410.86%
Tyrosine TYR (Y)41.81%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1076
HydrogenH1698
NitrogenN278
OxygenO316
SulphurS5

FormulaC1076H1698N278O316S5
Total Number of Atoms:3373


Total number of positively charged residues (ARG + LYS):16
Total number of negatively charged residues (ASP + GLU):18
Extinction Coefficient:This protein does not contain any Tryptophan residues. Experience shows that this could result in more than 10% error in the computed extinction coefficient.

Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    6085
Absorption 0.1% (=1 g/l)    0.256,   assuming all pairs of CYS residues form cystines

Ext. coefficient    5960
Absorption 0.1% (=1 g/l)    0.251,   assuming all CYS residues are reduced
Aromaticity:0.081

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 26.43

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[34.84, 27.60, 19.46]

Amino acids in helix: V, I, Y, F, W, L || Amino acids in turn: N, P, G, S || Amino acids in sheet: E, M, A, L
Aliphatic index:101.403
Grand average of hydropathicity (GRAVY):0.16