Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5737
Number of amino acids:154
Molecular Weight:16660.2 Da
Theoretical pI:7.52


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)127.79%
Cysteine CYS (C)1610.39%
Glutamic Acid GLU (E)117.14%
Aspartic Acid ASP (D)42.6%
Glycine GLY (G)1610.39%
Phynylalanine PHE (F)53.25%
Isoleucine ILE (I)63.9%
Histidine HIS (H)31.95%
Lysine LYS (K)127.79%
Methionine MET (M)42.6%
Leucine LEU (L)95.84%
Asparagine ASN (N)95.84%
Glutamine GLN (Q)00%
Proline PRO (P)106.49%
Serine SER (S)95.84%
Arginine ARG (R)42.6%
Threonine THR (T)63.9%
Tryptophan TRP (W)00%
Valine VAL (V)85.19%
Tyrosine TYR (Y)106.49%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC723
HydrogenH1119
NitrogenN193
OxygenO219
SulphurS20

FormulaC723H1119N193O219S20
Total Number of Atoms:2274


Total number of positively charged residues (ARG + LYS):16
Total number of negatively charged residues (ASP + GLU):15
Extinction Coefficient:This protein does not contain any Tryptophan residues. Experience shows that this could result in more than 10% error in the computed extinction coefficient.

Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    15900
Absorption 0.1% (=1 g/l)    0.954,   assuming all pairs of CYS residues form cystines

Ext. coefficient    14900
Absorption 0.1% (=1 g/l)    0.894,   assuming all CYS residues are reduced
Aromaticity:0.097

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 44.05

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[24.68, 28.57, 23.38]

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:60.8442
Grand average of hydropathicity (GRAVY):-0.18