Physicochemical Properties of Peptide



PPepDB ID:PPepDB_996
Number of amino acids:233
Molecular Weight:24131.77 Da
Theoretical pI:4.59


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)2611.16%
Cysteine CYS (C)166.87%
Glutamic Acid GLU (E)52.15%
Aspartic Acid ASP (D)135.58%
Glycine GLY (G)2611.16%
Phynylalanine PHE (F)104.29%
Isoleucine ILE (I)73%
Histidine HIS (H)20.86%
Lysine LYS (K)83.43%
Methionine MET (M)20.86%
Leucine LEU (L)135.58%
Asparagine ASN (N)125.15%
Glutamine GLN (Q)125.15%
Proline PRO (P)83.43%
Serine SER (S)239.87%
Arginine ARG (R)31.29%
Threonine THR (T)219.01%
Tryptophan TRP (W)31.29%
Valine VAL (V)146.01%
Tyrosine TYR (Y)93.86%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1038
HydrogenH1587
NitrogenN281
OxygenO347
SulphurS18

FormulaC1038H1587N281O347S18
Total Number of Atoms:3271


Total number of positively charged residues (ARG + LYS):11
Total number of negatively charged residues (ASP + GLU):18
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    30910
Absorption 0.1% (=1 g/l)    1.281,   assuming all pairs of CYS residues form cystines

Ext. coefficient    29910
Absorption 0.1% (=1 g/l)    1.239,   assuming all CYS residues are reduced
Aromaticity:0.094

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 22.52

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[24.03, 29.61, 19.74]

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:62.0601
Grand average of hydropathicity (GRAVY):-0.04