Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2995
Number of amino acids:49
Molecular Weight:5552.41 Da
Theoretical pI:8.92


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)12.04%
Cysteine CYS (C)816.33%
Glutamic Acid GLU (E)36.12%
Aspartic Acid ASP (D)12.04%
Glycine GLY (G)36.12%
Phynylalanine PHE (F)36.12%
Isoleucine ILE (I)00%
Histidine HIS (H)36.12%
Lysine LYS (K)510.2%
Methionine MET (M)12.04%
Leucine LEU (L)24.08%
Asparagine ASN (N)36.12%
Glutamine GLN (Q)12.04%
Proline PRO (P)12.04%
Serine SER (S)612.24%
Arginine ARG (R)48.16%
Threonine THR (T)12.04%
Tryptophan TRP (W)00%
Valine VAL (V)36.12%
Tyrosine TYR (Y)00%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC227
HydrogenH366
NitrogenN76
OxygenO69
SulphurS9

FormulaC227H366N76O69S9
Total Number of Atoms:747


Total number of positively charged residues (ARG + LYS):9
Total number of negatively charged residues (ASP + GLU):4
Extinction Coefficient:This protein does not contain any Tryptophan residues. Experience shows that this could result in more than 10% error in the computed extinction coefficient.

Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    500
Absorption 0.1% (=1 g/l)    0.090,   assuming all pairs of CYS residues form cystines

Ext. coefficient    0
Absorption 0.1% (=1 g/l)    0.000,   assuming all CYS residues are reduced
Aromaticity:0.061

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 41.39

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[16.33, 26.53, 14.29]

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:35.7143
Grand average of hydropathicity (GRAVY):-0.64