Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4030
Number of amino acids:181
Molecular Weight:19174 Da
Theoretical pI:5.78


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)189.94%
Cysteine CYS (C)73.87%
Glutamic Acid GLU (E)94.97%
Aspartic Acid ASP (D)84.42%
Glycine GLY (G)179.39%
Phynylalanine PHE (F)84.42%
Isoleucine ILE (I)73.87%
Histidine HIS (H)42.21%
Lysine LYS (K)94.97%
Methionine MET (M)42.21%
Leucine LEU (L)1910.5%
Asparagine ASN (N)42.21%
Glutamine GLN (Q)42.21%
Proline PRO (P)94.97%
Serine SER (S)189.94%
Arginine ARG (R)52.76%
Threonine THR (T)105.52%
Tryptophan TRP (W)10.55%
Valine VAL (V)147.73%
Tyrosine TYR (Y)63.31%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC852
HydrogenH1340
NitrogenN222
OxygenO258
SulphurS11

FormulaC852H1340N222O258S11
Total Number of Atoms:2683


Total number of positively charged residues (ARG + LYS):14
Total number of negatively charged residues (ASP + GLU):17
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    14815
Absorption 0.1% (=1 g/l)    0.773,   assuming all pairs of CYS residues form cystines

Ext. coefficient    14440
Absorption 0.1% (=1 g/l)    0.753,   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 : 35.91

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[30.39, 26.52, 27.62]

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:88.3976
Grand average of hydropathicity (GRAVY):0.18