Physicochemical Properties of Peptide



PPepDB ID:PPepDB_3043
Number of amino acids:47
Molecular Weight:5199.05 Da
Theoretical pI:8.95


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)24.26%
Cysteine CYS (C)817.02%
Glutamic Acid GLU (E)12.13%
Aspartic Acid ASP (D)24.26%
Glycine GLY (G)714.89%
Phynylalanine PHE (F)12.13%
Isoleucine ILE (I)24.26%
Histidine HIS (H)12.13%
Lysine LYS (K)24.26%
Methionine MET (M)24.26%
Leucine LEU (L)12.13%
Asparagine ASN (N)24.26%
Glutamine GLN (Q)48.51%
Proline PRO (P)00%
Serine SER (S)24.26%
Arginine ARG (R)612.77%
Threonine THR (T)00%
Tryptophan TRP (W)00%
Valine VAL (V)36.38%
Tyrosine TYR (Y)12.13%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC206
HydrogenH343
NitrogenN75
OxygenO63
SulphurS10

FormulaC206H343N75O63S10
Total Number of Atoms:697


Total number of positively charged residues (ARG + LYS):8
Total number of negatively charged residues (ASP + GLU):3
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    1990
Absorption 0.1% (=1 g/l)    0.383,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.287,   assuming all CYS residues are reduced
Aromaticity:0.043

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 77.64

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[17.02, 23.40, 12.77]

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:47.6596
Grand average of hydropathicity (GRAVY):-0.42