Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5940
Number of amino acids:86
Molecular Weight:8911.56 Da
Theoretical pI:8.77


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)1011.63%
Cysteine CYS (C)78.14%
Glutamic Acid GLU (E)11.16%
Aspartic Acid ASP (D)44.65%
Glycine GLY (G)1011.63%
Phynylalanine PHE (F)22.33%
Isoleucine ILE (I)22.33%
Histidine HIS (H)11.16%
Lysine LYS (K)66.98%
Methionine MET (M)89.3%
Leucine LEU (L)22.33%
Asparagine ASN (N)22.33%
Glutamine GLN (Q)22.33%
Proline PRO (P)55.81%
Serine SER (S)55.81%
Arginine ARG (R)33.49%
Threonine THR (T)55.81%
Tryptophan TRP (W)00%
Valine VAL (V)910.47%
Tyrosine TYR (Y)22.33%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC375
HydrogenH615
NitrogenN107
OxygenO113
SulphurS15

FormulaC375H615N107O113S15
Total Number of Atoms:1225


Total number of positively charged residues (ARG + LYS):9
Total number of negatively charged residues (ASP + GLU):5
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    3355
Absorption 0.1% (=1 g/l)    0.376,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.334,   assuming all CYS residues are reduced
Aromaticity:0.047

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 11.74

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[19.77, 25.58, 24.42]

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:60.1162
Grand average of hydropathicity (GRAVY):0.20