Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1040
Number of amino acids:254
Molecular Weight:27445.13 Da
Theoretical pI:8.14


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)218.27%
Cysteine CYS (C)166.3%
Glutamic Acid GLU (E)72.76%
Aspartic Acid ASP (D)51.97%
Glycine GLY (G)218.27%
Phynylalanine PHE (F)145.51%
Isoleucine ILE (I)93.54%
Histidine HIS (H)166.3%
Lysine LYS (K)72.76%
Methionine MET (M)31.18%
Leucine LEU (L)197.48%
Asparagine ASN (N)124.72%
Glutamine GLN (Q)72.76%
Proline PRO (P)207.87%
Serine SER (S)228.66%
Arginine ARG (R)83.15%
Threonine THR (T)239.06%
Tryptophan TRP (W)20.79%
Valine VAL (V)124.72%
Tyrosine TYR (Y)103.94%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1216
HydrogenH1834
NitrogenN338
OxygenO353
SulphurS19

FormulaC1216H1834N338O353S19
Total Number of Atoms:3760


Total number of positively charged residues (ARG + LYS):15
Total number of negatively charged residues (ASP + GLU):12
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    26900
Absorption 0.1% (=1 g/l)    0.980,   assuming all pairs of CYS residues form cystines

Ext. coefficient    25900
Absorption 0.1% (=1 g/l)    0.944,   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 : 55.74

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[25.98, 29.53, 19.68]

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:64.9606
Grand average of hydropathicity (GRAVY):-0.10