Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5727
Number of amino acids:187
Molecular Weight:20814.48 Da
Theoretical pI:9.19


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)136.95%
Cysteine CYS (C)52.67%
Glutamic Acid GLU (E)94.81%
Aspartic Acid ASP (D)73.74%
Glycine GLY (G)136.95%
Phynylalanine PHE (F)63.21%
Isoleucine ILE (I)2010.7%
Histidine HIS (H)21.07%
Lysine LYS (K)168.56%
Methionine MET (M)31.6%
Leucine LEU (L)2111.23%
Asparagine ASN (N)84.28%
Glutamine GLN (Q)42.14%
Proline PRO (P)115.88%
Serine SER (S)94.81%
Arginine ARG (R)73.74%
Threonine THR (T)168.56%
Tryptophan TRP (W)42.14%
Valine VAL (V)73.74%
Tyrosine TYR (Y)63.21%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC949
HydrogenH1522
NitrogenN244
OxygenO263
SulphurS8

FormulaC949H1522N244O263S8
Total Number of Atoms:2986


Total number of positively charged residues (ARG + LYS):23
Total number of negatively charged residues (ASP + GLU):16
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    31190
Absorption 0.1% (=1 g/l)    1.498,   assuming all pairs of CYS residues form cystines

Ext. coefficient    30940
Absorption 0.1% (=1 g/l)    1.486,   assuming all CYS residues are reduced
Aromaticity:0.086

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 34.38

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[34.22, 21.93, 24.60]

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:103.315
Grand average of hydropathicity (GRAVY):0.04