Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4102
Number of amino acids:276
Molecular Weight:29761.59 Da
Theoretical pI:8.59


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)259.06%
Cysteine CYS (C)82.9%
Glutamic Acid GLU (E)103.62%
Aspartic Acid ASP (D)134.71%
Glycine GLY (G)3713.41%
Phynylalanine PHE (F)113.99%
Isoleucine ILE (I)82.9%
Histidine HIS (H)31.09%
Lysine LYS (K)103.62%
Methionine MET (M)51.81%
Leucine LEU (L)176.16%
Asparagine ASN (N)145.07%
Glutamine GLN (Q)103.62%
Proline PRO (P)145.07%
Serine SER (S)207.25%
Arginine ARG (R)176.16%
Threonine THR (T)82.9%
Tryptophan TRP (W)72.54%
Valine VAL (V)269.42%
Tyrosine TYR (Y)134.71%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1321
HydrogenH2016
NitrogenN374
OxygenO388
SulphurS13

FormulaC1321H2016N374O388S13
Total Number of Atoms:4112


Total number of positively charged residues (ARG + LYS):27
Total number of negatively charged residues (ASP + GLU):23
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    58370
Absorption 0.1% (=1 g/l)    1.961,   assuming all pairs of CYS residues form cystines

Ext. coefficient    57870
Absorption 0.1% (=1 g/l)    1.944,   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 : 30.56

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[29.71, 30.80, 20.65]

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:71.7029
Grand average of hydropathicity (GRAVY):-0.20