Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4222
Number of amino acids:268
Molecular Weight:29191.77 Da
Theoretical pI:5.52


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)269.7%
Cysteine CYS (C)82.99%
Glutamic Acid GLU (E)103.73%
Aspartic Acid ASP (D)155.6%
Glycine GLY (G)238.58%
Phynylalanine PHE (F)165.97%
Isoleucine ILE (I)114.1%
Histidine HIS (H)51.87%
Lysine LYS (K)103.73%
Methionine MET (M)72.61%
Leucine LEU (L)114.1%
Asparagine ASN (N)155.6%
Glutamine GLN (Q)103.73%
Proline PRO (P)176.34%
Serine SER (S)248.96%
Arginine ARG (R)103.73%
Threonine THR (T)134.85%
Tryptophan TRP (W)62.24%
Valine VAL (V)217.84%
Tyrosine TYR (Y)103.73%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1299
HydrogenH1949
NitrogenN349
OxygenO391
SulphurS15

FormulaC1299H1949N349O391S15
Total Number of Atoms:4003


Total number of positively charged residues (ARG + LYS):20
Total number of negatively charged residues (ASP + GLU):25
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    48400
Absorption 0.1% (=1 g/l)    1.658,   assuming all pairs of CYS residues form cystines

Ext. coefficient    47900
Absorption 0.1% (=1 g/l)    1.641,   assuming all CYS residues are reduced
Aromaticity:0.119

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 24.66

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[27.99, 29.48, 20.15]

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:64.4403
Grand average of hydropathicity (GRAVY):-0.20