Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6101
Number of amino acids:73
Molecular Weight:8387.69 Da
Theoretical pI:8.92


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)34.11%
Cysteine CYS (C)810.96%
Glutamic Acid GLU (E)45.48%
Aspartic Acid ASP (D)00%
Glycine GLY (G)79.59%
Phynylalanine PHE (F)810.96%
Isoleucine ILE (I)34.11%
Histidine HIS (H)56.85%
Lysine LYS (K)34.11%
Methionine MET (M)22.74%
Leucine LEU (L)56.85%
Asparagine ASN (N)45.48%
Glutamine GLN (Q)22.74%
Proline PRO (P)00%
Serine SER (S)68.22%
Arginine ARG (R)68.22%
Threonine THR (T)34.11%
Tryptophan TRP (W)00%
Valine VAL (V)22.74%
Tyrosine TYR (Y)22.74%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC365
HydrogenH554
NitrogenN110
OxygenO99
SulphurS10

FormulaC365H554N110O99S10
Total Number of Atoms:1138


Total number of positively charged residues (ARG + LYS):9
Total number of negatively charged residues (ASP + GLU):4
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    3480
Absorption 0.1% (=1 g/l)    0.415,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.355,   assuming all CYS residues are reduced
Aromaticity:0.137

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 56.73

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[27.40, 23.29, 19.18]

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:54.7946
Grand average of hydropathicity (GRAVY):-0.13