Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5320
Number of amino acids:424
Molecular Weight:49843.93 Da
Theoretical pI:5.81


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)235.42%
Cysteine CYS (C)51.18%
Glutamic Acid GLU (E)388.96%
Aspartic Acid ASP (D)399.2%
Glycine GLY (G)255.9%
Phynylalanine PHE (F)204.72%
Isoleucine ILE (I)266.13%
Histidine HIS (H)81.89%
Lysine LYS (K)4310.14%
Methionine MET (M)40.94%
Leucine LEU (L)245.66%
Asparagine ASN (N)204.72%
Glutamine GLN (Q)122.83%
Proline PRO (P)286.6%
Serine SER (S)204.72%
Arginine ARG (R)276.37%
Threonine THR (T)112.59%
Tryptophan TRP (W)122.83%
Valine VAL (V)174.01%
Tyrosine TYR (Y)225.19%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC2247
HydrogenH3400
NitrogenN608
OxygenO664
SulphurS9

FormulaC2247H3400N608O664S9
Total Number of Atoms:6928


Total number of positively charged residues (ARG + LYS):70
Total number of negatively charged residues (ASP + GLU):77
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    99030
Absorption 0.1% (=1 g/l)    1.987,   assuming all pairs of CYS residues form cystines

Ext. coefficient    98780
Absorption 0.1% (=1 g/l)    1.982,   assuming all CYS residues are reduced
Aromaticity:0.127

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 43.51

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.54, 21.93, 20.99]

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:63.0425
Grand average of hydropathicity (GRAVY):-0.98