Physicochemical Properties of Peptide



PPepDB ID:PPepDB_823
Number of amino acids:79
Molecular Weight:8868.58 Da
Theoretical pI:8.28


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)56.33%
Cysteine CYS (C)67.59%
Glutamic Acid GLU (E)56.33%
Aspartic Acid ASP (D)00%
Glycine GLY (G)45.06%
Phynylalanine PHE (F)33.8%
Isoleucine ILE (I)67.59%
Histidine HIS (H)00%
Lysine LYS (K)22.53%
Methionine MET (M)45.06%
Leucine LEU (L)911.39%
Asparagine ASN (N)45.06%
Glutamine GLN (Q)33.8%
Proline PRO (P)22.53%
Serine SER (S)810.13%
Arginine ARG (R)56.33%
Threonine THR (T)11.27%
Tryptophan TRP (W)11.27%
Valine VAL (V)810.13%
Tyrosine TYR (Y)33.8%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC392
HydrogenH634
NitrogenN104
OxygenO109
SulphurS10

FormulaC392H634N104O109S10
Total Number of Atoms:1249


Total number of positively charged residues (ARG + LYS):7
Total number of negatively charged residues (ASP + GLU):5
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    10345
Absorption 0.1% (=1 g/l)    1.166,   assuming all pairs of CYS residues form cystines

Ext. coefficient    9970
Absorption 0.1% (=1 g/l)    1.124,   assuming all CYS residues are reduced
Aromaticity:0.089

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 58.30

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[37.97, 22.78, 29.11]

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:109.747
Grand average of hydropathicity (GRAVY):0.58