Physicochemical Properties of Peptide



PPepDB ID:PPepDB_599
Number of amino acids:180
Molecular Weight:19107.68 Da
Theoretical pI:8.74


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)158.33%
Cysteine CYS (C)137.22%
Glutamic Acid GLU (E)42.22%
Aspartic Acid ASP (D)52.78%
Glycine GLY (G)2413.33%
Phynylalanine PHE (F)73.89%
Isoleucine ILE (I)95%
Histidine HIS (H)21.11%
Lysine LYS (K)63.33%
Methionine MET (M)31.67%
Leucine LEU (L)95%
Asparagine ASN (N)147.78%
Glutamine GLN (Q)84.44%
Proline PRO (P)147.78%
Serine SER (S)84.44%
Arginine ARG (R)95%
Threonine THR (T)168.89%
Tryptophan TRP (W)52.78%
Valine VAL (V)63.33%
Tyrosine TYR (Y)31.67%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC826
HydrogenH1278
NitrogenN244
OxygenO248
SulphurS16

FormulaC826H1278N244O248S16
Total Number of Atoms:2612


Total number of positively charged residues (ARG + LYS):15
Total number of negatively charged residues (ASP + GLU):9
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    32720
Absorption 0.1% (=1 g/l)    1.712,   assuming all pairs of CYS residues form cystines

Ext. coefficient    31970
Absorption 0.1% (=1 g/l)    1.673,   assuming all CYS residues are reduced
Aromaticity:0.083

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 44.09

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[21.67, 33.33, 17.22]

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:57
Grand average of hydropathicity (GRAVY):-0.29