Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1448
Number of amino acids:233
Molecular Weight:24797.89 Da
Theoretical pI:4.9


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)156.44%
Cysteine CYS (C)166.87%
Glutamic Acid GLU (E)83.43%
Aspartic Acid ASP (D)166.87%
Glycine GLY (G)2711.59%
Phynylalanine PHE (F)146.01%
Isoleucine ILE (I)52.15%
Histidine HIS (H)10.43%
Lysine LYS (K)104.29%
Methionine MET (M)31.29%
Leucine LEU (L)135.58%
Asparagine ASN (N)83.43%
Glutamine GLN (Q)41.72%
Proline PRO (P)166.87%
Serine SER (S)239.87%
Arginine ARG (R)93.86%
Threonine THR (T)156.44%
Tryptophan TRP (W)41.72%
Valine VAL (V)187.73%
Tyrosine TYR (Y)83.43%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1087
HydrogenH1646
NitrogenN288
OxygenO340
SulphurS19

FormulaC1087H1646N288O340S19
Total Number of Atoms:3380


Total number of positively charged residues (ARG + LYS):19
Total number of negatively charged residues (ASP + GLU):24
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    34920
Absorption 0.1% (=1 g/l)    1.408,   assuming all pairs of CYS residues form cystines

Ext. coefficient    33920
Absorption 0.1% (=1 g/l)    1.368,   assuming all CYS residues are reduced
Aromaticity:0.112

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 44.28

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[26.61, 31.76, 16.74]

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:58.9699
Grand average of hydropathicity (GRAVY):-0.12