Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2148
Number of amino acids:50
Molecular Weight:5503.31 Da
Theoretical pI:8.48


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)36%
Cysteine CYS (C)816%
Glutamic Acid GLU (E)36%
Aspartic Acid ASP (D)12%
Glycine GLY (G)612%
Phynylalanine PHE (F)12%
Isoleucine ILE (I)24%
Histidine HIS (H)24%
Lysine LYS (K)510%
Methionine MET (M)00%
Leucine LEU (L)24%
Asparagine ASN (N)24%
Glutamine GLN (Q)12%
Proline PRO (P)24%
Serine SER (S)48%
Arginine ARG (R)24%
Threonine THR (T)12%
Tryptophan TRP (W)12%
Valine VAL (V)12%
Tyrosine TYR (Y)36%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC233
HydrogenH359
NitrogenN69
OxygenO70
SulphurS8

FormulaC233H359N69O70S8
Total Number of Atoms:739


Total number of positively charged residues (ARG + LYS):7
Total number of negatively charged residues (ASP + GLU):4
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    10470
Absorption 0.1% (=1 g/l)    1.902,   assuming all pairs of CYS residues form cystines

Ext. coefficient    9970
Absorption 0.1% (=1 g/l)    1.812,   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 : 28.13

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[20.00, 28.00, 16.00]

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:43
Grand average of hydropathicity (GRAVY):-0.49