Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6171
Number of amino acids:74
Molecular Weight:8436.87 Da
Theoretical pI:9.06


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)22.7%
Cysteine CYS (C)912.16%
Glutamic Acid GLU (E)45.41%
Aspartic Acid ASP (D)11.35%
Glycine GLY (G)79.46%
Phynylalanine PHE (F)79.46%
Isoleucine ILE (I)11.35%
Histidine HIS (H)34.05%
Lysine LYS (K)22.7%
Methionine MET (M)22.7%
Leucine LEU (L)79.46%
Asparagine ASN (N)34.05%
Glutamine GLN (Q)34.05%
Proline PRO (P)00%
Serine SER (S)68.11%
Arginine ARG (R)912.16%
Threonine THR (T)22.7%
Tryptophan TRP (W)00%
Valine VAL (V)68.11%
Tyrosine TYR (Y)00%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC359
HydrogenH573
NitrogenN115
OxygenO99
SulphurS11

FormulaC359H573N115O99S11
Total Number of Atoms:1157


Total number of positively charged residues (ARG + LYS):11
Total number of negatively charged residues (ASP + GLU):5
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    500
Absorption 0.1% (=1 g/l)    0.059,   assuming all pairs of CYS residues form cystines

Ext. coefficient    0
Absorption 0.1% (=1 g/l)    0.000,   assuming all CYS residues are reduced
Aromaticity:0.095

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 57.02

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.38, 21.62, 20.27]

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:68.3784
Grand average of hydropathicity (GRAVY):0.01