Physicochemical Properties of Peptide



PPepDB ID:PPepDB_3932
Number of amino acids:46
Molecular Weight:5301.16 Da
Theoretical pI:8.51


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)24.35%
Cysteine CYS (C)817.39%
Glutamic Acid GLU (E)12.17%
Aspartic Acid ASP (D)36.52%
Glycine GLY (G)12.17%
Phynylalanine PHE (F)12.17%
Isoleucine ILE (I)510.87%
Histidine HIS (H)00%
Lysine LYS (K)24.35%
Methionine MET (M)12.17%
Leucine LEU (L)00%
Asparagine ASN (N)613.04%
Glutamine GLN (Q)00%
Proline PRO (P)48.7%
Serine SER (S)00%
Arginine ARG (R)510.87%
Threonine THR (T)48.7%
Tryptophan TRP (W)00%
Valine VAL (V)12.17%
Tyrosine TYR (Y)24.35%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC218
HydrogenH353
NitrogenN69
OxygenO67
SulphurS9

FormulaC218H353N69O67S9
Total Number of Atoms:716


Total number of positively charged residues (ARG + LYS):7
Total number of negatively charged residues (ASP + GLU):4
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)    0.656,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.562,   assuming all CYS residues are reduced
Aromaticity:0.065

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 41.76

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[19.57, 23.91, 8.70]

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:53.0436
Grand average of hydropathicity (GRAVY):-0.49