Physicochemical Properties of Peptide



PPepDB ID:PPepDB_191
Number of amino acids:4
Molecular Weight:438.48 Da
Theoretical pI:5.18


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)00%
Cysteine CYS (C)00%
Glutamic Acid GLU (E)00%
Aspartic Acid ASP (D)00%
Glycine GLY (G)125%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)00%
Histidine HIS (H)00%
Lysine LYS (K)00%
Methionine MET (M)00%
Leucine LEU (L)00%
Asparagine ASN (N)00%
Glutamine GLN (Q)00%
Proline PRO (P)00%
Serine SER (S)00%
Arginine ARG (R)00%
Threonine THR (T)125%
Tryptophan TRP (W)00%
Valine VAL (V)125%
Tyrosine TYR (Y)125%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC20
HydrogenH30
NitrogenN4
OxygenO7
SulphurS0

FormulaC20H30N4O7S0
Total Number of Atoms:61


Total number of positively charged residues (ARG + LYS):0
Total number of negatively charged residues (ASP + GLU):0
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    1490
Absorption 0.1% (=1 g/l)    3.398
Aromaticity:0.250

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : -32.58

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[50.00, 25.00, 0.00]

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:72.5
Grand average of hydropathicity (GRAVY):0.45