Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1098
Number of amino acids:134
Molecular Weight:14147.15 Da
Theoretical pI:4.39


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)118.21%
Cysteine CYS (C)128.96%
Glutamic Acid GLU (E)85.97%
Aspartic Acid ASP (D)53.73%
Glycine GLY (G)85.97%
Phynylalanine PHE (F)32.24%
Isoleucine ILE (I)96.72%
Histidine HIS (H)00%
Lysine LYS (K)42.99%
Methionine MET (M)53.73%
Leucine LEU (L)96.72%
Asparagine ASN (N)107.46%
Glutamine GLN (Q)42.99%
Proline PRO (P)32.24%
Serine SER (S)1611.94%
Arginine ARG (R)32.24%
Threonine THR (T)107.46%
Tryptophan TRP (W)00%
Valine VAL (V)118.21%
Tyrosine TYR (Y)32.24%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC592
HydrogenH965
NitrogenN161
OxygenO204
SulphurS17

FormulaC592H965N161O204S17
Total Number of Atoms:1939


Total number of positively charged residues (ARG + LYS):7
Total number of negatively charged residues (ASP + GLU):13
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    5220
Absorption 0.1% (=1 g/l)    0.369,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    0.316,   assuming all CYS residues are reduced
Aromaticity:0.045

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 53.18

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[26.12, 27.61, 24.63]

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:84.403
Grand average of hydropathicity (GRAVY):0.25