Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2249
Number of amino acids:77
Molecular Weight:8524.07 Da
Theoretical pI:9.37


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)56.49%
Cysteine CYS (C)810.39%
Glutamic Acid GLU (E)33.9%
Aspartic Acid ASP (D)00%
Glycine GLY (G)79.09%
Phynylalanine PHE (F)67.79%
Isoleucine ILE (I)33.9%
Histidine HIS (H)33.9%
Lysine LYS (K)22.6%
Methionine MET (M)56.49%
Leucine LEU (L)33.9%
Asparagine ASN (N)45.19%
Glutamine GLN (Q)11.3%
Proline PRO (P)11.3%
Serine SER (S)67.79%
Arginine ARG (R)810.39%
Threonine THR (T)56.49%
Tryptophan TRP (W)00%
Valine VAL (V)79.09%
Tyrosine TYR (Y)00%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC360
HydrogenH582
NitrogenN114
OxygenO100
SulphurS13

FormulaC360H582N114O100S13
Total Number of Atoms:1169


Total number of positively charged residues (ARG + LYS):10
Total number of negatively charged residues (ASP + GLU):3
Extinction Coefficient:This protein does not contain any Tryptophan residues. Experience shows that this could result in more than 10% error in the computed extinction coefficient.

Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    500
Absorption 0.1% (=1 g/l)    0.059,   assuming all pairs of CYS residues form cystines

Ext. coefficient    0
Absorption 0.1% (=1 g/l)    0.000,   assuming all CYS residues are reduced
Aromaticity:0.078

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 40.13

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[24.68, 23.38, 20.78]

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:63.2467
Grand average of hydropathicity (GRAVY):0.20