Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1919
Number of amino acids:32
Molecular Weight:3371.89 Da
Theoretical pI:4


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)26.25%
Cysteine CYS (C)618.75%
Glutamic Acid GLU (E)13.13%
Aspartic Acid ASP (D)00%
Glycine GLY (G)13.13%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)412.5%
Histidine HIS (H)00%
Lysine LYS (K)00%
Methionine MET (M)00%
Leucine LEU (L)13.13%
Asparagine ASN (N)26.25%
Glutamine GLN (Q)13.13%
Proline PRO (P)13.13%
Serine SER (S)515.63%
Arginine ARG (R)00%
Threonine THR (T)412.5%
Tryptophan TRP (W)13.13%
Valine VAL (V)26.25%
Tyrosine TYR (Y)13.13%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC140
HydrogenH224
NitrogenN36
OxygenO48
SulphurS6

FormulaC140H224N36O48S6
Total Number of Atoms:454


Total number of positively charged residues (ARG + LYS):0
Total number of negatively charged residues (ASP + GLU):1
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    7365
Absorption 0.1% (=1 g/l)    2.184,   assuming all pairs of CYS residues form cystines

Ext. coefficient    6990
Absorption 0.1% (=1 g/l)    2.073,   assuming all CYS residues are reduced
Aromaticity:0.062

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 38.66

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.12, 28.12, 12.50]

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:85.3125
Grand average of hydropathicity (GRAVY):0.74