Physicochemical Properties of Peptide



PPepDB ID:PPepDB_3044
Number of amino acids:37
Molecular Weight:3826.47 Da
Theoretical pI:5.9


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)513.51%
Cysteine CYS (C)616.22%
Glutamic Acid GLU (E)00%
Aspartic Acid ASP (D)25.41%
Glycine GLY (G)38.11%
Phynylalanine PHE (F)410.81%
Isoleucine ILE (I)00%
Histidine HIS (H)00%
Lysine LYS (K)12.7%
Methionine MET (M)00%
Leucine LEU (L)38.11%
Asparagine ASN (N)25.41%
Glutamine GLN (Q)12.7%
Proline PRO (P)38.11%
Serine SER (S)25.41%
Arginine ARG (R)12.7%
Threonine THR (T)12.7%
Tryptophan TRP (W)00%
Valine VAL (V)38.11%
Tyrosine TYR (Y)00%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC166
HydrogenH254
NitrogenN44
OxygenO48
SulphurS6

FormulaC166H254N44O48S6
Total Number of Atoms:518


Total number of positively charged residues (ARG + LYS):2
Total number of negatively charged residues (ASP + GLU):2
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    375
Absorption 0.1% (=1 g/l)    0.098,   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:0.108

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 48.46

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[27.03, 27.03, 21.62]

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:68.6486
Grand average of hydropathicity (GRAVY):0.68