Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1295
Number of amino acids:245
Molecular Weight:26166.16 Da
Theoretical pI:9.2


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)228.98%
Cysteine CYS (C)166.53%
Glutamic Acid GLU (E)31.22%
Aspartic Acid ASP (D)83.27%
Glycine GLY (G)239.39%
Phynylalanine PHE (F)135.31%
Isoleucine ILE (I)52.04%
Histidine HIS (H)41.63%
Lysine LYS (K)228.98%
Methionine MET (M)52.04%
Leucine LEU (L)145.71%
Asparagine ASN (N)145.71%
Glutamine GLN (Q)83.27%
Proline PRO (P)239.39%
Serine SER (S)156.12%
Arginine ARG (R)41.63%
Threonine THR (T)218.57%
Tryptophan TRP (W)31.22%
Valine VAL (V)135.31%
Tyrosine TYR (Y)93.67%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1162
HydrogenH1792
NitrogenN312
OxygenO335
SulphurS21

FormulaC1162H1792N312O335S21
Total Number of Atoms:3622


Total number of positively charged residues (ARG + LYS):26
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    30910
Absorption 0.1% (=1 g/l)    1.181,   assuming all pairs of CYS residues form cystines

Ext. coefficient    29910
Absorption 0.1% (=1 g/l)    1.143,   assuming all CYS residues are reduced
Aromaticity:0.102

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 33.75

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[23.27, 30.61, 17.96]

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:54.6123
Grand average of hydropathicity (GRAVY):-0.26