Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1153
Number of amino acids:255
Molecular Weight:26772.32 Da
Theoretical pI:5.66


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)3212.55%
Cysteine CYS (C)187.06%
Glutamic Acid GLU (E)62.35%
Aspartic Acid ASP (D)145.49%
Glycine GLY (G)3112.16%
Phynylalanine PHE (F)103.92%
Isoleucine ILE (I)72.75%
Histidine HIS (H)20.78%
Lysine LYS (K)51.96%
Methionine MET (M)62.35%
Leucine LEU (L)155.88%
Asparagine ASN (N)41.57%
Glutamine GLN (Q)83.14%
Proline PRO (P)145.49%
Serine SER (S)166.27%
Arginine ARG (R)135.1%
Threonine THR (T)249.41%
Tryptophan TRP (W)51.96%
Valine VAL (V)145.49%
Tyrosine TYR (Y)114.31%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1164
HydrogenH1782
NitrogenN320
OxygenO359
SulphurS24

FormulaC1164H1782N320O359S24
Total Number of Atoms:3649


Total number of positively charged residues (ARG + LYS):18
Total number of negatively charged residues (ASP + GLU):20
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    45015
Absorption 0.1% (=1 g/l)    1.681,   assuming all pairs of CYS residues form cystines

Ext. coefficient    43890
Absorption 0.1% (=1 g/l)    1.639,   assuming all CYS residues are reduced
Aromaticity:0.102

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 39.13

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[24.31, 25.49, 23.14]

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:62.1176
Grand average of hydropathicity (GRAVY):0.04