Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1294
Number of amino acids:246
Molecular Weight:25699.94 Da
Theoretical pI:4.98


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)2610.57%
Cysteine CYS (C)166.5%
Glutamic Acid GLU (E)83.25%
Aspartic Acid ASP (D)124.88%
Glycine GLY (G)228.94%
Phynylalanine PHE (F)114.47%
Isoleucine ILE (I)72.85%
Histidine HIS (H)10.41%
Lysine LYS (K)124.88%
Methionine MET (M)31.22%
Leucine LEU (L)145.69%
Asparagine ASN (N)114.47%
Glutamine GLN (Q)93.66%
Proline PRO (P)218.54%
Serine SER (S)239.35%
Arginine ARG (R)41.63%
Threonine THR (T)218.54%
Tryptophan TRP (W)31.22%
Valine VAL (V)145.69%
Tyrosine TYR (Y)83.25%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1122
HydrogenH1725
NitrogenN295
OxygenO359
SulphurS19

FormulaC1122H1725N295O359S19
Total Number of Atoms:3520


Total number of positively charged residues (ARG + LYS):16
Total number of negatively charged residues (ASP + GLU):20
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    29420
Absorption 0.1% (=1 g/l)    1.145,   assuming all pairs of CYS residues form cystines

Ext. coefficient    28420
Absorption 0.1% (=1 g/l)    1.106,   assuming all CYS residues are reduced
Aromaticity:0.089

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 48.27

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[23.17, 31.30, 20.73]

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:60.3659
Grand average of hydropathicity (GRAVY):-0.12