Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5669
Number of amino acids:335
Molecular Weight:34893.92 Da
Theoretical pI:4.56


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)4212.54%
Cysteine CYS (C)20.6%
Glutamic Acid GLU (E)82.39%
Aspartic Acid ASP (D)154.48%
Glycine GLY (G)339.85%
Phynylalanine PHE (F)133.88%
Isoleucine ILE (I)154.48%
Histidine HIS (H)30.9%
Lysine LYS (K)51.49%
Methionine MET (M)61.79%
Leucine LEU (L)278.06%
Asparagine ASN (N)257.46%
Glutamine GLN (Q)205.97%
Proline PRO (P)236.87%
Serine SER (S)329.55%
Arginine ARG (R)82.39%
Threonine THR (T)164.78%
Tryptophan TRP (W)20.6%
Valine VAL (V)267.76%
Tyrosine TYR (Y)144.18%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1546
HydrogenH2385
NitrogenN417
OxygenO489
SulphurS8

FormulaC1546H2385N417O489S8
Total Number of Atoms:4845


Total number of positively charged residues (ARG + LYS):13
Total number of negatively charged residues (ASP + GLU):23
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    31985
Absorption 0.1% (=1 g/l)    0.917,   assuming all pairs of CYS residues form cystines

Ext. coefficient    31860
Absorption 0.1% (=1 g/l)    0.913,   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 : 43.86

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.96, 33.73, 24.78]

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:83.9403
Grand average of hydropathicity (GRAVY):-0.01