Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6027
Number of amino acids:76
Molecular Weight:8271.81 Da
Theoretical pI:6.1


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)33.95%
Cysteine CYS (C)911.84%
Glutamic Acid GLU (E)45.26%
Aspartic Acid ASP (D)45.26%
Glycine GLY (G)45.26%
Phynylalanine PHE (F)11.32%
Isoleucine ILE (I)79.21%
Histidine HIS (H)00%
Lysine LYS (K)56.58%
Methionine MET (M)22.63%
Leucine LEU (L)810.53%
Asparagine ASN (N)22.63%
Glutamine GLN (Q)00%
Proline PRO (P)33.95%
Serine SER (S)911.84%
Arginine ARG (R)33.95%
Threonine THR (T)33.95%
Tryptophan TRP (W)00%
Valine VAL (V)67.89%
Tyrosine TYR (Y)33.95%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC356
HydrogenH590
NitrogenN92
OxygenO110
SulphurS11

FormulaC356H590N92O110S11
Total Number of Atoms:1159


Total number of positively charged residues (ARG + LYS):8
Total number of negatively charged residues (ASP + GLU):8
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    4970
Absorption 0.1% (=1 g/l)    0.601,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    0.540,   assuming all CYS residues are reduced
Aromaticity:0.053

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 54.82

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[32.89, 23.68, 22.37]

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:103.816
Grand average of hydropathicity (GRAVY):0.45