Physicochemical Properties of Peptide



PPepDB ID:PPepDB_727
Number of amino acids:50
Molecular Weight:5607.48 Da
Theoretical pI:8.94


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)36%
Cysteine CYS (C)816%
Glutamic Acid GLU (E)24%
Aspartic Acid ASP (D)00%
Glycine GLY (G)510%
Phynylalanine PHE (F)24%
Isoleucine ILE (I)24%
Histidine HIS (H)24%
Lysine LYS (K)24%
Methionine MET (M)00%
Leucine LEU (L)24%
Asparagine ASN (N)48%
Glutamine GLN (Q)12%
Proline PRO (P)36%
Serine SER (S)36%
Arginine ARG (R)510%
Threonine THR (T)12%
Tryptophan TRP (W)12%
Valine VAL (V)24%
Tyrosine TYR (Y)24%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC237
HydrogenH367
NitrogenN77
OxygenO66
SulphurS8

FormulaC237H367N77O66S8
Total Number of Atoms:755


Total number of positively charged residues (ARG + LYS):7
Total number of negatively charged residues (ASP + GLU):2
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    8980
Absorption 0.1% (=1 g/l)    1.601,   assuming all pairs of CYS residues form cystines

Ext. coefficient    8480
Absorption 0.1% (=1 g/l)    1.512,   assuming all CYS residues are reduced
Aromaticity:0.100

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 34.32

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[22.00, 30.00, 14.00]

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:48.8
Grand average of hydropathicity (GRAVY):-0.37