Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5830
Number of amino acids:296
Molecular Weight:33941.3 Da
Theoretical pI:8.83


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)134.39%
Cysteine CYS (C)62.03%
Glutamic Acid GLU (E)31.01%
Aspartic Acid ASP (D)10.34%
Glycine GLY (G)72.36%
Phynylalanine PHE (F)124.05%
Isoleucine ILE (I)155.07%
Histidine HIS (H)51.69%
Lysine LYS (K)10.34%
Methionine MET (M)20.68%
Leucine LEU (L)227.43%
Asparagine ASN (N)72.36%
Glutamine GLN (Q)9732.77%
Proline PRO (P)5016.89%
Serine SER (S)144.73%
Arginine ARG (R)72.36%
Threonine THR (T)103.38%
Tryptophan TRP (W)10.34%
Valine VAL (V)144.73%
Tyrosine TYR (Y)93.04%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1515
HydrogenH2333
NitrogenN433
OxygenO442
SulphurS8

FormulaC1515H2333N433O442S8
Total Number of Atoms:4731


Total number of positively charged residues (ARG + LYS):8
Total number of negatively charged residues (ASP + GLU):4
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    19285
Absorption 0.1% (=1 g/l)    0.568,   assuming all pairs of CYS residues form cystines

Ext. coefficient    18910
Absorption 0.1% (=1 g/l)    0.557,   assuming all CYS residues are reduced
Aromaticity:0.074

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 115.16

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[24.66, 26.35, 13.51]

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:66.8581
Grand average of hydropathicity (GRAVY):-0.87