Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6055
Number of amino acids:147
Molecular Weight:15964.54 Da
Theoretical pI:8.12


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)1711.56%
Cysteine CYS (C)96.12%
Glutamic Acid GLU (E)106.8%
Aspartic Acid ASP (D)85.44%
Glycine GLY (G)106.8%
Phynylalanine PHE (F)32.04%
Isoleucine ILE (I)21.36%
Histidine HIS (H)42.72%
Lysine LYS (K)32.04%
Methionine MET (M)32.04%
Leucine LEU (L)1711.56%
Asparagine ASN (N)21.36%
Glutamine GLN (Q)32.04%
Proline PRO (P)85.44%
Serine SER (S)74.76%
Arginine ARG (R)1711.56%
Threonine THR (T)64.08%
Tryptophan TRP (W)00%
Valine VAL (V)1711.56%
Tyrosine TYR (Y)10.68%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC682
HydrogenH1134
NitrogenN214
OxygenO203
SulphurS12

FormulaC682H1134N214O203S12
Total Number of Atoms:2245


Total number of positively charged residues (ARG + LYS):20
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    1990
Absorption 0.1% (=1 g/l)    0.125,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.093,   assuming all CYS residues are reduced
Aromaticity:0.027

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 41.62

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[27.21, 18.37, 31.97]

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:95.51
Grand average of hydropathicity (GRAVY):0.02