Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5876
Number of amino acids:80
Molecular Weight:8738.13 Da
Theoretical pI:6.7


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)56.25%
Cysteine CYS (C)810%
Glutamic Acid GLU (E)22.5%
Aspartic Acid ASP (D)45%
Glycine GLY (G)45%
Phynylalanine PHE (F)45%
Isoleucine ILE (I)45%
Histidine HIS (H)11.25%
Lysine LYS (K)67.5%
Methionine MET (M)33.75%
Leucine LEU (L)45%
Asparagine ASN (N)45%
Glutamine GLN (Q)22.5%
Proline PRO (P)45%
Serine SER (S)911.25%
Arginine ARG (R)00%
Threonine THR (T)45%
Tryptophan TRP (W)00%
Valine VAL (V)78.75%
Tyrosine TYR (Y)56.25%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC383
HydrogenH592
NitrogenN94
OxygenO117
SulphurS11

FormulaC383H592N94O117S11
Total Number of Atoms:1197


Total number of positively charged residues (ARG + LYS):6
Total number of negatively charged residues (ASP + GLU):6
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    7950
Absorption 0.1% (=1 g/l)    0.910,   assuming all pairs of CYS residues form cystines

Ext. coefficient    7450
Absorption 0.1% (=1 g/l)    0.853,   assuming all CYS residues are reduced
Aromaticity:0.113

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 65.77

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[30.00, 26.25, 17.50]

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:70.625
Grand average of hydropathicity (GRAVY):0.19