Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5894
Number of amino acids:170
Molecular Weight:19361.17 Da
Theoretical pI:6.96


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)105.88%
Cysteine CYS (C)105.88%
Glutamic Acid GLU (E)105.88%
Aspartic Acid ASP (D)84.71%
Glycine GLY (G)105.88%
Phynylalanine PHE (F)105.88%
Isoleucine ILE (I)74.12%
Histidine HIS (H)31.76%
Lysine LYS (K)84.71%
Methionine MET (M)52.94%
Leucine LEU (L)148.24%
Asparagine ASN (N)52.94%
Glutamine GLN (Q)2212.94%
Proline PRO (P)137.65%
Serine SER (S)74.12%
Arginine ARG (R)105.88%
Threonine THR (T)74.12%
Tryptophan TRP (W)00%
Valine VAL (V)74.12%
Tyrosine TYR (Y)42.35%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC844
HydrogenH1325
NitrogenN241
OxygenO252
SulphurS15

FormulaC844H1325N241O252S15
Total Number of Atoms:2677


Total number of positively charged residues (ARG + LYS):18
Total number of negatively charged residues (ASP + GLU):18
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    6585
Absorption 0.1% (=1 g/l)    0.340,   assuming all pairs of CYS residues form cystines

Ext. coefficient    5960
Absorption 0.1% (=1 g/l)    0.308,   assuming all CYS residues are reduced
Aromaticity:0.082

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 62.21

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[24.71, 20.59, 22.94]

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:66
Grand average of hydropathicity (GRAVY):-0.53