Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5954
Number of amino acids:180
Molecular Weight:20026.14 Da
Theoretical pI:6.15


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)84.44%
Cysteine CYS (C)21.11%
Glutamic Acid GLU (E)95%
Aspartic Acid ASP (D)84.44%
Glycine GLY (G)137.22%
Phynylalanine PHE (F)73.89%
Isoleucine ILE (I)126.67%
Histidine HIS (H)126.67%
Lysine LYS (K)84.44%
Methionine MET (M)116.11%
Leucine LEU (L)179.44%
Asparagine ASN (N)84.44%
Glutamine GLN (Q)10.56%
Proline PRO (P)116.11%
Serine SER (S)1910.56%
Arginine ARG (R)42.22%
Threonine THR (T)84.44%
Tryptophan TRP (W)42.22%
Valine VAL (V)147.78%
Tyrosine TYR (Y)42.22%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC900
HydrogenH1389
NitrogenN237
OxygenO255
SulphurS13

FormulaC900H1389N237O255S13
Total Number of Atoms:2794


Total number of positively charged residues (ARG + LYS):12
Total number of negatively charged residues (ASP + GLU):17
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    28085
Absorption 0.1% (=1 g/l)    1.402,   assuming all pairs of CYS residues form cystines

Ext. coefficient    27960
Absorption 0.1% (=1 g/l)    1.396,   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 : 52.41

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[32.22, 28.33, 25.00]

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:89.8333
Grand average of hydropathicity (GRAVY):0.04