Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5570
Number of amino acids:258
Molecular Weight:27749.6 Da
Theoretical pI:9.4


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)238.91%
Cysteine CYS (C)83.1%
Glutamic Acid GLU (E)31.16%
Aspartic Acid ASP (D)72.71%
Glycine GLY (G)2911.24%
Phynylalanine PHE (F)155.81%
Isoleucine ILE (I)135.04%
Histidine HIS (H)20.78%
Lysine LYS (K)124.65%
Methionine MET (M)62.33%
Leucine LEU (L)166.2%
Asparagine ASN (N)249.3%
Glutamine GLN (Q)83.1%
Proline PRO (P)135.04%
Serine SER (S)218.14%
Arginine ARG (R)93.49%
Threonine THR (T)166.2%
Tryptophan TRP (W)72.71%
Valine VAL (V)176.59%
Tyrosine TYR (Y)93.49%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1242
HydrogenH1894
NitrogenN340
OxygenO357
SulphurS14

FormulaC1242H1894N340O357S14
Total Number of Atoms:3847


Total number of positively charged residues (ARG + LYS):21
Total number of negatively charged residues (ASP + GLU):10
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    52410
Absorption 0.1% (=1 g/l)    1.889,   assuming all pairs of CYS residues form cystines

Ext. coefficient    51910
Absorption 0.1% (=1 g/l)    1.871,   assuming all CYS residues are reduced
Aromaticity:0.120

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 21.30

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[29.84, 33.72, 18.60]

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:71.8605
Grand average of hydropathicity (GRAVY):-0.05