Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5835
Number of amino acids:203
Molecular Weight:22545.94 Da
Theoretical pI:4.97


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)146.9%
Cysteine CYS (C)52.46%
Glutamic Acid GLU (E)115.42%
Aspartic Acid ASP (D)146.9%
Glycine GLY (G)157.39%
Phynylalanine PHE (F)136.4%
Isoleucine ILE (I)146.9%
Histidine HIS (H)10.49%
Lysine LYS (K)115.42%
Methionine MET (M)41.97%
Leucine LEU (L)199.36%
Asparagine ASN (N)62.96%
Glutamine GLN (Q)94.43%
Proline PRO (P)104.93%
Serine SER (S)125.91%
Arginine ARG (R)94.43%
Threonine THR (T)125.91%
Tryptophan TRP (W)20.99%
Valine VAL (V)167.88%
Tyrosine TYR (Y)62.96%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1018
HydrogenH1592
NitrogenN260
OxygenO299
SulphurS9

FormulaC1018H1592N260O299S9
Total Number of Atoms:3178


Total number of positively charged residues (ARG + LYS):20
Total number of negatively charged residues (ASP + GLU):25
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    20190
Absorption 0.1% (=1 g/l)    0.896,   assuming all pairs of CYS residues form cystines

Ext. coefficient    19940
Absorption 0.1% (=1 g/l)    0.884,   assuming all CYS residues are reduced
Aromaticity:0.103

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 41.27

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[34.48, 21.18, 23.65]

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:93.1527
Grand average of hydropathicity (GRAVY):0.04