Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5756
Number of amino acids:281
Molecular Weight:30751.7 Da
Theoretical pI:4.91


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)217.47%
Cysteine CYS (C)10.36%
Glutamic Acid GLU (E)103.56%
Aspartic Acid ASP (D)155.34%
Glycine GLY (G)186.41%
Phynylalanine PHE (F)155.34%
Isoleucine ILE (I)186.41%
Histidine HIS (H)51.78%
Lysine LYS (K)113.91%
Methionine MET (M)41.42%
Leucine LEU (L)248.54%
Asparagine ASN (N)165.69%
Glutamine GLN (Q)155.34%
Proline PRO (P)176.05%
Serine SER (S)269.25%
Arginine ARG (R)51.78%
Threonine THR (T)238.19%
Tryptophan TRP (W)51.78%
Valine VAL (V)227.83%
Tyrosine TYR (Y)103.56%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1394
HydrogenH2135
NitrogenN353
OxygenO422
SulphurS5

FormulaC1394H2135N353O422S5
Total Number of Atoms:4309


Total number of positively charged residues (ARG + LYS):16
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    42400
Absorption 0.1% (=1 g/l)    1.379,   assuming all pairs of CYS residues form cystines

Ext. coefficient    42400
Absorption 0.1% (=1 g/l)    1.379,   assuming all CYS residues are reduced
Aromaticity:0.107

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 32.19

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[33.45, 27.40, 21.00]

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:88.4698
Grand average of hydropathicity (GRAVY):-0.04