Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2728
Number of amino acids:50
Molecular Weight:5194.62 Da
Theoretical pI:4.8


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)24%
Cysteine CYS (C)1020%
Glutamic Acid GLU (E)24%
Aspartic Acid ASP (D)36%
Glycine GLY (G)918%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)12%
Histidine HIS (H)24%
Lysine LYS (K)00%
Methionine MET (M)00%
Leucine LEU (L)00%
Asparagine ASN (N)12%
Glutamine GLN (Q)36%
Proline PRO (P)48%
Serine SER (S)612%
Arginine ARG (R)24%
Threonine THR (T)12%
Tryptophan TRP (W)12%
Valine VAL (V)00%
Tyrosine TYR (Y)36%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC205
HydrogenH299
NitrogenN65
OxygenO75
SulphurS10

FormulaC205H299N65O75S10
Total Number of Atoms:654


Total number of positively charged residues (ARG + LYS):2
Total number of negatively charged residues (ASP + GLU):5
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    10595
Absorption 0.1% (=1 g/l)    2.040,   assuming all pairs of CYS residues form cystines

Ext. coefficient    9970
Absorption 0.1% (=1 g/l)    1.919,   assuming all CYS residues are reduced
Aromaticity:0.080

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 21.81

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[10.00, 40.00, 8.00]

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:11.8
Grand average of hydropathicity (GRAVY):-0.68