Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6127
Number of amino acids:77
Molecular Weight:8558.03 Da
Theoretical pI:5.15


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)33.9%
Cysteine CYS (C)810.39%
Glutamic Acid GLU (E)56.49%
Aspartic Acid ASP (D)45.19%
Glycine GLY (G)56.49%
Phynylalanine PHE (F)45.19%
Isoleucine ILE (I)45.19%
Histidine HIS (H)11.3%
Lysine LYS (K)79.09%
Methionine MET (M)45.19%
Leucine LEU (L)67.79%
Asparagine ASN (N)33.9%
Glutamine GLN (Q)00%
Proline PRO (P)45.19%
Serine SER (S)67.79%
Arginine ARG (R)00%
Threonine THR (T)56.49%
Tryptophan TRP (W)11.3%
Valine VAL (V)45.19%
Tyrosine TYR (Y)33.9%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC376
HydrogenH584
NitrogenN90
OxygenO113
SulphurS12

FormulaC376H584N90O113S12
Total Number of Atoms:1175


Total number of positively charged residues (ARG + LYS):7
Total number of negatively charged residues (ASP + GLU):9
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    10470
Absorption 0.1% (=1 g/l)    1.223,   assuming all pairs of CYS residues form cystines

Ext. coefficient    9970
Absorption 0.1% (=1 g/l)    1.165,   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 : 55.84

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.57, 23.38, 23.38]

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:69.6104
Grand average of hydropathicity (GRAVY):0.10