Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2031
Number of amino acids:72
Molecular Weight:8203.58 Da
Theoretical pI:7.51


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)56.94%
Cysteine CYS (C)912.5%
Glutamic Acid GLU (E)56.94%
Aspartic Acid ASP (D)34.17%
Glycine GLY (G)56.94%
Phynylalanine PHE (F)68.33%
Isoleucine ILE (I)11.39%
Histidine HIS (H)22.78%
Lysine LYS (K)45.56%
Methionine MET (M)22.78%
Leucine LEU (L)811.11%
Asparagine ASN (N)34.17%
Glutamine GLN (Q)11.39%
Proline PRO (P)11.39%
Serine SER (S)22.78%
Arginine ARG (R)56.94%
Threonine THR (T)56.94%
Tryptophan TRP (W)11.39%
Valine VAL (V)34.17%
Tyrosine TYR (Y)11.39%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC356
HydrogenH554
NitrogenN100
OxygenO101
SulphurS11

FormulaC356H554N100O101S11
Total Number of Atoms:1122


Total number of positively charged residues (ARG + LYS):9
Total number of negatively charged residues (ASP + GLU):8
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    7490
Absorption 0.1% (=1 g/l)    0.913,   assuming all pairs of CYS residues form cystines

Ext. coefficient    6990
Absorption 0.1% (=1 g/l)    0.852,   assuming all CYS residues are reduced
Aromaticity:0.111

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 21.33

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[27.78, 15.28, 27.78]

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:67.7777
Grand average of hydropathicity (GRAVY):0.03