Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2840
Number of amino acids:48
Molecular Weight:5494.13 Da
Theoretical pI:6.65


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)00%
Cysteine CYS (C)816.67%
Glutamic Acid GLU (E)36.25%
Aspartic Acid ASP (D)48.33%
Glycine GLY (G)48.33%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)12.08%
Histidine HIS (H)24.17%
Lysine LYS (K)36.25%
Methionine MET (M)00%
Leucine LEU (L)12.08%
Asparagine ASN (N)24.17%
Glutamine GLN (Q)00%
Proline PRO (P)12.08%
Serine SER (S)36.25%
Arginine ARG (R)48.33%
Threonine THR (T)510.42%
Tryptophan TRP (W)12.08%
Valine VAL (V)36.25%
Tyrosine TYR (Y)36.25%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC224
HydrogenH348
NitrogenN70
OxygenO76
SulphurS8

FormulaC224H348N70O76S8
Total Number of Atoms:726


Total number of positively charged residues (ARG + LYS):7
Total number of negatively charged residues (ASP + GLU):7
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    10470
Absorption 0.1% (=1 g/l)    1.906,   assuming all pairs of CYS residues form cystines

Ext. coefficient    9970
Absorption 0.1% (=1 g/l)    1.815,   assuming all CYS residues are reduced
Aromaticity:0.083

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 52.77

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[18.75, 20.83, 8.33]

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:34.375
Grand average of hydropathicity (GRAVY):-0.85