Physicochemical Properties of Peptide



PPepDB ID:PPepDB_770
Number of amino acids:161
Molecular Weight:16163.07 Da
Theoretical pI:4.88


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)2012.42%
Cysteine CYS (C)84.97%
Glutamic Acid GLU (E)10.62%
Aspartic Acid ASP (D)74.35%
Glycine GLY (G)2213.66%
Phynylalanine PHE (F)63.73%
Isoleucine ILE (I)42.48%
Histidine HIS (H)31.86%
Lysine LYS (K)10.62%
Methionine MET (M)42.48%
Leucine LEU (L)138.07%
Asparagine ASN (N)95.59%
Glutamine GLN (Q)42.48%
Proline PRO (P)84.97%
Serine SER (S)169.94%
Arginine ARG (R)31.86%
Threonine THR (T)1710.56%
Tryptophan TRP (W)31.86%
Valine VAL (V)95.59%
Tyrosine TYR (Y)31.86%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC696
HydrogenH1075
NitrogenN193
OxygenO227
SulphurS12

FormulaC696H1075N193O227S12
Total Number of Atoms:2203


Total number of positively charged residues (ARG + LYS):4
Total number of negatively charged residues (ASP + GLU):8
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    21470
Absorption 0.1% (=1 g/l)    1.328,   assuming all pairs of CYS residues form cystines

Ext. coefficient    20970
Absorption 0.1% (=1 g/l)    1.297,   assuming all CYS residues are reduced
Aromaticity:0.075

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 38.58

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[23.60, 34.16, 23.60]

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:69.8137
Grand average of hydropathicity (GRAVY):0.20