Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2762
Number of amino acids:47
Molecular Weight:5203.91 Da
Theoretical pI:9.1


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)24.26%
Cysteine CYS (C)817.02%
Glutamic Acid GLU (E)24.26%
Aspartic Acid ASP (D)12.13%
Glycine GLY (G)510.64%
Phynylalanine PHE (F)24.26%
Isoleucine ILE (I)12.13%
Histidine HIS (H)24.26%
Lysine LYS (K)48.51%
Methionine MET (M)00%
Leucine LEU (L)00%
Asparagine ASN (N)24.26%
Glutamine GLN (Q)24.26%
Proline PRO (P)00%
Serine SER (S)510.64%
Arginine ARG (R)510.64%
Threonine THR (T)36.38%
Tryptophan TRP (W)00%
Valine VAL (V)24.26%
Tyrosine TYR (Y)12.13%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC208
HydrogenH338
NitrogenN74
OxygenO67
SulphurS8

FormulaC208H338N74O67S8
Total Number of Atoms:695


Total number of positively charged residues (ARG + LYS):9
Total number of negatively charged residues (ASP + GLU):3
Extinction Coefficient:This protein does not contain any Tryptophan residues. Experience shows that this could result in more than 10% error in the computed extinction coefficient.

Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    1990
Absorption 0.1% (=1 g/l)    0.382,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.286,   assuming all CYS residues are reduced
Aromaticity:0.064

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 51.73

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[12.77, 25.53, 8.51]

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:24.8936
Grand average of hydropathicity (GRAVY):-0.77