Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4745
Number of amino acids:262
Molecular Weight:28134.31 Da
Theoretical pI:8.52


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)269.92%
Cysteine CYS (C)93.44%
Glutamic Acid GLU (E)62.29%
Aspartic Acid ASP (D)114.2%
Glycine GLY (G)3011.45%
Phynylalanine PHE (F)114.2%
Isoleucine ILE (I)145.34%
Histidine HIS (H)41.53%
Lysine LYS (K)155.73%
Methionine MET (M)103.82%
Leucine LEU (L)176.49%
Asparagine ASN (N)134.96%
Glutamine GLN (Q)51.91%
Proline PRO (P)124.58%
Serine SER (S)176.49%
Arginine ARG (R)62.29%
Threonine THR (T)218.02%
Tryptophan TRP (W)72.67%
Valine VAL (V)166.11%
Tyrosine TYR (Y)124.58%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1261
HydrogenH1930
NitrogenN328
OxygenO365
SulphurS19

FormulaC1261H1930N328O365S19
Total Number of Atoms:3903


Total number of positively charged residues (ARG + LYS):21
Total number of negatively charged residues (ASP + GLU):17
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    56880
Absorption 0.1% (=1 g/l)    2.022,   assuming all pairs of CYS residues form cystines

Ext. coefficient    56380
Absorption 0.1% (=1 g/l)    2.004,   assuming all CYS residues are reduced
Aromaticity:0.115

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 31.36

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[29.39, 27.48, 22.52]

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:73.7786
Grand average of hydropathicity (GRAVY):0.04