Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1170
Number of amino acids:133
Molecular Weight:14182.57 Da
Theoretical pI:7.32


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)107.52%
Cysteine CYS (C)1511.28%
Glutamic Acid GLU (E)64.51%
Aspartic Acid ASP (D)75.26%
Glycine GLY (G)139.77%
Phynylalanine PHE (F)21.5%
Isoleucine ILE (I)10.75%
Histidine HIS (H)00%
Lysine LYS (K)86.02%
Methionine MET (M)53.76%
Leucine LEU (L)1712.78%
Asparagine ASN (N)86.02%
Glutamine GLN (Q)32.26%
Proline PRO (P)32.26%
Serine SER (S)86.02%
Arginine ARG (R)64.51%
Threonine THR (T)64.51%
Tryptophan TRP (W)00%
Valine VAL (V)118.27%
Tyrosine TYR (Y)43.01%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC595
HydrogenH982
NitrogenN170
OxygenO189
SulphurS20

FormulaC595H982N170O189S20
Total Number of Atoms:1956


Total number of positively charged residues (ARG + LYS):14
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    6835
Absorption 0.1% (=1 g/l)    0.482,   assuming all pairs of CYS residues form cystines

Ext. coefficient    5960
Absorption 0.1% (=1 g/l)    0.420,   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 : 23.28

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[26.32, 24.06, 28.57]

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:84.2859
Grand average of hydropathicity (GRAVY):0.14