Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5090
Number of amino acids:258
Molecular Weight:28167.33 Da
Theoretical pI:5.08


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)155.81%
Cysteine CYS (C)20.78%
Glutamic Acid GLU (E)176.59%
Aspartic Acid ASP (D)145.43%
Glycine GLY (G)207.75%
Phynylalanine PHE (F)83.1%
Isoleucine ILE (I)72.71%
Histidine HIS (H)41.55%
Lysine LYS (K)166.2%
Methionine MET (M)51.94%
Leucine LEU (L)4015.5%
Asparagine ASN (N)114.26%
Glutamine GLN (Q)93.49%
Proline PRO (P)93.49%
Serine SER (S)218.14%
Arginine ARG (R)72.71%
Threonine THR (T)176.59%
Tryptophan TRP (W)20.78%
Valine VAL (V)2610.08%
Tyrosine TYR (Y)83.1%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1262
HydrogenH2025
NitrogenN325
OxygenO387
SulphurS7

FormulaC1262H2025N325O387S7
Total Number of Atoms:4006


Total number of positively charged residues (ARG + LYS):23
Total number of negatively charged residues (ASP + GLU):31
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    23045
Absorption 0.1% (=1 g/l)    0.818,   assuming all pairs of CYS residues form cystines

Ext. coefficient    22920
Absorption 0.1% (=1 g/l)    0.814,   assuming all CYS residues are reduced
Aromaticity:0.070

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 34.77

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[35.27, 23.64, 29.84]

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:106.085
Grand average of hydropathicity (GRAVY):0.03