Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6077
Number of amino acids:240
Molecular Weight:26254.65 Da
Theoretical pI:8.52


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)3514.58%
Cysteine CYS (C)31.25%
Glutamic Acid GLU (E)10.42%
Aspartic Acid ASP (D)10.42%
Glycine GLY (G)20.83%
Phynylalanine PHE (F)135.42%
Isoleucine ILE (I)114.58%
Histidine HIS (H)10.42%
Lysine LYS (K)10.42%
Methionine MET (M)31.25%
Leucine LEU (L)4820%
Asparagine ASN (N)114.58%
Glutamine GLN (Q)4317.92%
Proline PRO (P)229.17%
Serine SER (S)197.92%
Arginine ARG (R)31.25%
Threonine THR (T)83.33%
Tryptophan TRP (W)00%
Valine VAL (V)72.92%
Tyrosine TYR (Y)83.33%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1208
HydrogenH1908
NitrogenN306
OxygenO334
SulphurS6

FormulaC1208H1908N306O334S6
Total Number of Atoms:3762


Total number of positively charged residues (ARG + LYS):4
Total number of negatively charged residues (ASP + GLU):2
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    12045
Absorption 0.1% (=1 g/l)    0.459,   assuming all pairs of CYS residues form cystines

Ext. coefficient    11920
Absorption 0.1% (=1 g/l)    0.454,   assuming all CYS residues are reduced
Aromaticity:0.087

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 72.59

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[36.25, 22.50, 36.25]

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:118.917
Grand average of hydropathicity (GRAVY):0.38