Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4395
Number of amino acids:322
Molecular Weight:35938.6 Da
Theoretical pI:8.96


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)175.28%
Cysteine CYS (C)92.8%
Glutamic Acid GLU (E)164.97%
Aspartic Acid ASP (D)206.21%
Glycine GLY (G)195.9%
Phynylalanine PHE (F)144.35%
Isoleucine ILE (I)144.35%
Histidine HIS (H)134.04%
Lysine LYS (K)164.97%
Methionine MET (M)51.55%
Leucine LEU (L)268.07%
Asparagine ASN (N)154.66%
Glutamine GLN (Q)41.24%
Proline PRO (P)154.66%
Serine SER (S)3912.11%
Arginine ARG (R)278.39%
Threonine THR (T)206.21%
Tryptophan TRP (W)41.24%
Valine VAL (V)247.45%
Tyrosine TYR (Y)51.55%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1564
HydrogenH2482
NitrogenN468
OxygenO478
SulphurS14

FormulaC1564H2482N468O478S14
Total Number of Atoms:5006


Total number of positively charged residues (ARG + LYS):43
Total number of negatively charged residues (ASP + GLU):36
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    29950
Absorption 0.1% (=1 g/l)    0.833,   assuming all pairs of CYS residues form cystines

Ext. coefficient    29450
Absorption 0.1% (=1 g/l)    0.819,   assuming all CYS residues are reduced
Aromaticity:0.071

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 55.50

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[27.02, 27.33, 19.88]

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:75.3416
Grand average of hydropathicity (GRAVY):-0.44