Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6026
Number of amino acids:77
Molecular Weight:8389.8 Da
Theoretical pI:7.47


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)56.49%
Cysteine CYS (C)911.69%
Glutamic Acid GLU (E)33.9%
Aspartic Acid ASP (D)33.9%
Glycine GLY (G)56.49%
Phynylalanine PHE (F)45.19%
Isoleucine ILE (I)56.49%
Histidine HIS (H)11.3%
Lysine LYS (K)56.49%
Methionine MET (M)33.9%
Leucine LEU (L)33.9%
Asparagine ASN (N)33.9%
Glutamine GLN (Q)11.3%
Proline PRO (P)45.19%
Serine SER (S)911.69%
Arginine ARG (R)22.6%
Threonine THR (T)22.6%
Tryptophan TRP (W)00%
Valine VAL (V)67.79%
Tyrosine TYR (Y)45.19%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC364
HydrogenH568
NitrogenN94
OxygenO109
SulphurS12

FormulaC364H568N94O109S12
Total Number of Atoms:1147


Total number of positively charged residues (ARG + LYS):7
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    6460
Absorption 0.1% (=1 g/l)    0.770,   assuming all pairs of CYS residues form cystines

Ext. coefficient    5960
Absorption 0.1% (=1 g/l)    0.710,   assuming all CYS residues are reduced
Aromaticity:0.104

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 40.60

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.57, 27.27, 18.18]

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:69.6104
Grand average of hydropathicity (GRAVY):0.24