Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1835
Number of amino acids:31
Molecular Weight:3187.74 Da
Theoretical pI:5.96


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)00%
Cysteine CYS (C)619.35%
Glutamic Acid GLU (E)13.23%
Aspartic Acid ASP (D)00%
Glycine GLY (G)39.68%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)26.45%
Histidine HIS (H)00%
Lysine LYS (K)13.23%
Methionine MET (M)00%
Leucine LEU (L)26.45%
Asparagine ASN (N)39.68%
Glutamine GLN (Q)00%
Proline PRO (P)26.45%
Serine SER (S)412.9%
Arginine ARG (R)00%
Threonine THR (T)26.45%
Tryptophan TRP (W)13.23%
Valine VAL (V)412.9%
Tyrosine TYR (Y)00%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC132
HydrogenH216
NitrogenN36
OxygenO43
SulphurS6

FormulaC132H216N36O43S6
Total Number of Atoms:433


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

Ext. coefficient    5875
Absorption 0.1% (=1 g/l)    1.843,   assuming all pairs of CYS residues form cystines

Ext. coefficient    5500
Absorption 0.1% (=1 g/l)    1.725,   assuming all CYS residues are reduced
Aromaticity:0.032

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 43.73

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[29.03, 38.71, 9.68]

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:87.7418
Grand average of hydropathicity (GRAVY):0.67