Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4401
Number of amino acids:121
Molecular Weight:13565.71 Da
Theoretical pI:7.68


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)64.96%
Cysteine CYS (C)97.44%
Glutamic Acid GLU (E)86.61%
Aspartic Acid ASP (D)32.48%
Glycine GLY (G)32.48%
Phynylalanine PHE (F)32.48%
Isoleucine ILE (I)21.65%
Histidine HIS (H)21.65%
Lysine LYS (K)119.09%
Methionine MET (M)32.48%
Leucine LEU (L)129.92%
Asparagine ASN (N)75.79%
Glutamine GLN (Q)75.79%
Proline PRO (P)119.09%
Serine SER (S)119.09%
Arginine ARG (R)10.83%
Threonine THR (T)54.13%
Tryptophan TRP (W)10.83%
Valine VAL (V)108.26%
Tyrosine TYR (Y)64.96%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC599
HydrogenH942
NitrogenN154
OxygenO180
SulphurS12

FormulaC599H942N154O180S12
Total Number of Atoms:1887


Total number of positively charged residues (ARG + LYS):12
Total number of negatively charged residues (ASP + GLU):11
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    14940
Absorption 0.1% (=1 g/l)    1.101,   assuming all pairs of CYS residues form cystines

Ext. coefficient    14440
Absorption 0.1% (=1 g/l)    1.064,   assuming all CYS residues are reduced
Aromaticity:0.083

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 53.32

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.10, 26.45, 23.97]

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:74.0496
Grand average of hydropathicity (GRAVY):-0.31