Physicochemical Properties of Peptide



PPepDB ID:PPepDB_801
Number of amino acids:255
Molecular Weight:27203.02 Da
Theoretical pI:5.89


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)239.02%
Cysteine CYS (C)197.45%
Glutamic Acid GLU (E)62.35%
Aspartic Acid ASP (D)155.88%
Glycine GLY (G)249.41%
Phynylalanine PHE (F)145.49%
Isoleucine ILE (I)176.67%
Histidine HIS (H)31.18%
Lysine LYS (K)135.1%
Methionine MET (M)20.78%
Leucine LEU (L)187.06%
Asparagine ASN (N)135.1%
Glutamine GLN (Q)62.35%
Proline PRO (P)145.49%
Serine SER (S)187.06%
Arginine ARG (R)62.35%
Threonine THR (T)228.63%
Tryptophan TRP (W)31.18%
Valine VAL (V)103.92%
Tyrosine TYR (Y)93.53%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1200
HydrogenH1848
NitrogenN314
OxygenO366
SulphurS21

FormulaC1200H1848N314O366S21
Total Number of Atoms:3749


Total number of positively charged residues (ARG + LYS):19
Total number of negatively charged residues (ASP + GLU):21
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    31035
Absorption 0.1% (=1 g/l)    1.141,   assuming all pairs of CYS residues form cystines

Ext. coefficient    29910
Absorption 0.1% (=1 g/l)    1.100,   assuming all CYS residues are reduced
Aromaticity:0.102

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 37.11

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[27.84, 27.06, 19.22]

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:73.9216
Grand average of hydropathicity (GRAVY):0.06