Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4752
Number of amino acids:109
Molecular Weight:10668.56 Da
Theoretical pI:8.52


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)1614.68%
Cysteine CYS (C)87.34%
Glutamic Acid GLU (E)21.83%
Aspartic Acid ASP (D)10.92%
Glycine GLY (G)1412.84%
Phynylalanine PHE (F)10.92%
Isoleucine ILE (I)21.83%
Histidine HIS (H)00%
Lysine LYS (K)21.83%
Methionine MET (M)10.92%
Leucine LEU (L)1614.68%
Asparagine ASN (N)10.92%
Glutamine GLN (Q)65.5%
Proline PRO (P)1311.93%
Serine SER (S)76.42%
Arginine ARG (R)43.67%
Threonine THR (T)76.42%
Tryptophan TRP (W)00%
Valine VAL (V)76.42%
Tyrosine TYR (Y)10.92%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC464
HydrogenH772
NitrogenN130
OxygenO138
SulphurS9

FormulaC464H772N130O138S9
Total Number of Atoms:1513


Total number of positively charged residues (ARG + LYS):6
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)    0.187,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.140,   assuming all CYS residues are reduced
Aromaticity:0.018

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 59.92

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[24.77, 32.11, 32.11]

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:97.7064
Grand average of hydropathicity (GRAVY):0.49