Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5511
Number of amino acids:295
Molecular Weight:33379.11 Da
Theoretical pI:7.73


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)113.73%
Cysteine CYS (C)82.71%
Glutamic Acid GLU (E)62.03%
Aspartic Acid ASP (D)10.34%
Glycine GLY (G)103.39%
Phynylalanine PHE (F)134.41%
Isoleucine ILE (I)124.07%
Histidine HIS (H)41.36%
Lysine LYS (K)20.68%
Methionine MET (M)72.37%
Leucine LEU (L)3010.17%
Asparagine ASN (N)31.02%
Glutamine GLN (Q)8629.15%
Proline PRO (P)3311.19%
Serine SER (S)237.8%
Arginine ARG (R)62.03%
Threonine THR (T)134.41%
Tryptophan TRP (W)10.34%
Valine VAL (V)217.12%
Tyrosine TYR (Y)51.69%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1476
HydrogenH2327
NitrogenN413
OxygenO440
SulphurS15

FormulaC1476H2327N413O440S15
Total Number of Atoms:4671


Total number of positively charged residues (ARG + LYS):8
Total number of negatively charged residues (ASP + GLU):7
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    13450
Absorption 0.1% (=1 g/l)    0.403,   assuming all pairs of CYS residues form cystines

Ext. coefficient    12950
Absorption 0.1% (=1 g/l)    0.388,   assuming all CYS residues are reduced
Aromaticity:0.064

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 100.24

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[27.80, 23.39, 18.31]

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:79.8983
Grand average of hydropathicity (GRAVY):-0.44