Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1034
Number of amino acids:248
Molecular Weight:26749.98 Da
Theoretical pI:9.38


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)239.27%
Cysteine CYS (C)166.45%
Glutamic Acid GLU (E)20.81%
Aspartic Acid ASP (D)83.23%
Glycine GLY (G)249.68%
Phynylalanine PHE (F)124.84%
Isoleucine ILE (I)124.84%
Histidine HIS (H)41.61%
Lysine LYS (K)93.63%
Methionine MET (M)41.61%
Leucine LEU (L)249.68%
Asparagine ASN (N)104.03%
Glutamine GLN (Q)62.42%
Proline PRO (P)176.85%
Serine SER (S)228.87%
Arginine ARG (R)176.85%
Threonine THR (T)166.45%
Tryptophan TRP (W)31.21%
Valine VAL (V)93.63%
Tyrosine TYR (Y)104.03%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1184
HydrogenH1853
NitrogenN335
OxygenO333
SulphurS20

FormulaC1184H1853N335O333S20
Total Number of Atoms:3725


Total number of positively charged residues (ARG + LYS):26
Total number of negatively charged residues (ASP + GLU):10
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    32400
Absorption 0.1% (=1 g/l)    1.211,   assuming all pairs of CYS residues form cystines

Ext. coefficient    31400
Absorption 0.1% (=1 g/l)    1.174,   assuming all CYS residues are reduced
Aromaticity:0.101

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 54.47

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.23, 29.44, 21.37]

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:76.4113
Grand average of hydropathicity (GRAVY):0.04