Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5642
Number of amino acids:221
Molecular Weight:24009.5 Da
Theoretical pI:6.87


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)83.62%
Cysteine CYS (C)83.62%
Glutamic Acid GLU (E)41.81%
Aspartic Acid ASP (D)135.88%
Glycine GLY (G)198.6%
Phynylalanine PHE (F)135.88%
Isoleucine ILE (I)125.43%
Histidine HIS (H)20.9%
Lysine LYS (K)114.98%
Methionine MET (M)31.36%
Leucine LEU (L)2310.41%
Asparagine ASN (N)104.52%
Glutamine GLN (Q)94.07%
Proline PRO (P)114.98%
Serine SER (S)2712.22%
Arginine ARG (R)62.71%
Threonine THR (T)135.88%
Tryptophan TRP (W)31.36%
Valine VAL (V)198.6%
Tyrosine TYR (Y)73.17%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1078
HydrogenH1678
NitrogenN276
OxygenO322
SulphurS11

FormulaC1078H1678N276O322S11
Total Number of Atoms:3365


Total number of positively charged residues (ARG + LYS):17
Total number of negatively charged residues (ASP + GLU):17
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    27430
Absorption 0.1% (=1 g/l)    1.142,   assuming all pairs of CYS residues form cystines

Ext. coefficient    26930
Absorption 0.1% (=1 g/l)    1.122,   assuming all CYS residues are reduced
Aromaticity:0.104

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 32.24

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[34.84, 30.32, 17.19]

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:90.3166
Grand average of hydropathicity (GRAVY):0.12