Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6128
Number of amino acids:77
Molecular Weight:8668.26 Da
Theoretical pI:6.15


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)45.19%
Cysteine CYS (C)79.09%
Glutamic Acid GLU (E)67.79%
Aspartic Acid ASP (D)22.6%
Glycine GLY (G)56.49%
Phynylalanine PHE (F)56.49%
Isoleucine ILE (I)67.79%
Histidine HIS (H)00%
Lysine LYS (K)810.39%
Methionine MET (M)45.19%
Leucine LEU (L)33.9%
Asparagine ASN (N)22.6%
Glutamine GLN (Q)22.6%
Proline PRO (P)33.9%
Serine SER (S)56.49%
Arginine ARG (R)00%
Threonine THR (T)45.19%
Tryptophan TRP (W)11.3%
Valine VAL (V)67.79%
Tyrosine TYR (Y)45.19%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC389
HydrogenH602
NitrogenN90
OxygenO111
SulphurS11

FormulaC389H602N90O111S11
Total Number of Atoms:1203


Total number of positively charged residues (ARG + LYS):8
Total number of negatively charged residues (ASP + GLU):8
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    11835
Absorption 0.1% (=1 g/l)    1.365,   assuming all pairs of CYS residues form cystines

Ext. coefficient    11460
Absorption 0.1% (=1 g/l)    1.322,   assuming all CYS residues are reduced
Aromaticity:0.130

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 58.49

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[32.47, 19.48, 22.08]

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:73.3766
Grand average of hydropathicity (GRAVY):0.22