Physicochemical Properties of Peptide



PPepDB ID:PPepDB_965
Number of amino acids:255
Molecular Weight:26492.49 Da
Theoretical pI:4.54


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)249.41%
Cysteine CYS (C)166.27%
Glutamic Acid GLU (E)93.53%
Aspartic Acid ASP (D)124.71%
Glycine GLY (G)2911.37%
Phynylalanine PHE (F)166.27%
Isoleucine ILE (I)51.96%
Histidine HIS (H)10.39%
Lysine LYS (K)62.35%
Methionine MET (M)41.57%
Leucine LEU (L)187.06%
Asparagine ASN (N)83.14%
Glutamine GLN (Q)41.57%
Proline PRO (P)187.06%
Serine SER (S)3011.76%
Arginine ARG (R)72.75%
Threonine THR (T)2911.37%
Tryptophan TRP (W)31.18%
Valine VAL (V)72.75%
Tyrosine TYR (Y)93.53%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1154
HydrogenH1741
NitrogenN299
OxygenO378
SulphurS20

FormulaC1154H1741N299O378S20
Total Number of Atoms:3592


Total number of positively charged residues (ARG + LYS):13
Total number of negatively charged residues (ASP + GLU):21
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    30910
Absorption 0.1% (=1 g/l)    1.167,   assuming all pairs of CYS residues form cystines

Ext. coefficient    29910
Absorption 0.1% (=1 g/l)    1.129,   assuming all CYS residues are reduced
Aromaticity:0.110

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 44.58

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[22.75, 33.33, 21.57]

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:52.549
Grand average of hydropathicity (GRAVY):-0.07