Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2006
Number of amino acids:32
Molecular Weight:3351.82 Da
Theoretical pI:4.37


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)13.13%
Cysteine CYS (C)618.75%
Glutamic Acid GLU (E)13.13%
Aspartic Acid ASP (D)13.13%
Glycine GLY (G)618.75%
Phynylalanine PHE (F)13.13%
Isoleucine ILE (I)13.13%
Histidine HIS (H)00%
Lysine LYS (K)13.13%
Methionine MET (M)00%
Leucine LEU (L)39.38%
Asparagine ASN (N)13.13%
Glutamine GLN (Q)13.13%
Proline PRO (P)13.13%
Serine SER (S)26.25%
Arginine ARG (R)00%
Threonine THR (T)39.38%
Tryptophan TRP (W)13.13%
Valine VAL (V)00%
Tyrosine TYR (Y)26.25%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC142
HydrogenH212
NitrogenN36
OxygenO46
SulphurS6

FormulaC142H212N36O46S6
Total Number of Atoms:442


Total number of positively charged residues (ARG + LYS):1
Total number of negatively charged residues (ASP + GLU):2
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    8855
Absorption 0.1% (=1 g/l)    2.642,   assuming all pairs of CYS residues form cystines

Ext. coefficient    8480
Absorption 0.1% (=1 g/l)    2.530,   assuming all CYS residues are reduced
Aromaticity:0.125

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 12.08

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[25.00, 31.25, 15.62]

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:51.875
Grand average of hydropathicity (GRAVY):0.20