Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6031
Number of amino acids:78
Molecular Weight:8181.64 Da
Theoretical pI:5.53


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)67.69%
Cysteine CYS (C)810.26%
Glutamic Acid GLU (E)22.56%
Aspartic Acid ASP (D)45.13%
Glycine GLY (G)911.54%
Phynylalanine PHE (F)33.85%
Isoleucine ILE (I)45.13%
Histidine HIS (H)11.28%
Lysine LYS (K)22.56%
Methionine MET (M)56.41%
Leucine LEU (L)56.41%
Asparagine ASN (N)11.28%
Glutamine GLN (Q)22.56%
Proline PRO (P)56.41%
Serine SER (S)67.69%
Arginine ARG (R)33.85%
Threonine THR (T)33.85%
Tryptophan TRP (W)00%
Valine VAL (V)78.97%
Tyrosine TYR (Y)22.56%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC350
HydrogenH560
NitrogenN94
OxygenO105
SulphurS13

FormulaC350H560N94O105S13
Total Number of Atoms:1122


Total number of positively charged residues (ARG + LYS):5
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    3480
Absorption 0.1% (=1 g/l)    0.425,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.364,   assuming all CYS residues are reduced
Aromaticity:0.064

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 37.74

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[26.92, 26.92, 23.08]

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:78.718
Grand average of hydropathicity (GRAVY):0.49