Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5116
Number of amino acids:284
Molecular Weight:31465.06 Da
Theoretical pI:6.08


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)124.23%
Cysteine CYS (C)124.23%
Glutamic Acid GLU (E)82.82%
Aspartic Acid ASP (D)103.52%
Glycine GLY (G)51.76%
Phynylalanine PHE (F)165.63%
Isoleucine ILE (I)165.63%
Histidine HIS (H)41.41%
Lysine LYS (K)41.41%
Methionine MET (M)62.11%
Leucine LEU (L)3110.92%
Asparagine ASN (N)134.58%
Glutamine GLN (Q)124.23%
Proline PRO (P)3010.56%
Serine SER (S)4014.08%
Arginine ARG (R)124.23%
Threonine THR (T)269.15%
Tryptophan TRP (W)00%
Valine VAL (V)155.28%
Tyrosine TYR (Y)124.23%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1407
HydrogenH2187
NitrogenN357
OxygenO424
SulphurS18

FormulaC1407H2187N357O424S18
Total Number of Atoms:4393


Total number of positively charged residues (ARG + LYS):16
Total number of negatively charged residues (ASP + GLU):18
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    18630
Absorption 0.1% (=1 g/l)    0.592,   assuming all pairs of CYS residues form cystines

Ext. coefficient    17880
Absorption 0.1% (=1 g/l)    0.568,   assuming all CYS residues are reduced
Aromaticity:0.099

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 66.32

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[31.69, 30.99, 20.07]

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:84.0845
Grand average of hydropathicity (GRAVY):0.04