Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5413
Number of amino acids:130
Molecular Weight:14441.59 Da
Theoretical pI:8.74


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)118.46%
Cysteine CYS (C)107.69%
Glutamic Acid GLU (E)96.92%
Aspartic Acid ASP (D)64.62%
Glycine GLY (G)64.62%
Phynylalanine PHE (F)21.54%
Isoleucine ILE (I)75.38%
Histidine HIS (H)21.54%
Lysine LYS (K)96.92%
Methionine MET (M)21.54%
Leucine LEU (L)75.38%
Asparagine ASN (N)32.31%
Glutamine GLN (Q)43.08%
Proline PRO (P)32.31%
Serine SER (S)1713.08%
Arginine ARG (R)118.46%
Threonine THR (T)43.08%
Tryptophan TRP (W)43.08%
Valine VAL (V)129.23%
Tyrosine TYR (Y)10.77%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC615
HydrogenH1003
NitrogenN187
OxygenO190
SulphurS12

FormulaC615H1003N187O190S12
Total Number of Atoms:2007


Total number of positively charged residues (ARG + LYS):20
Total number of negatively charged residues (ASP + GLU):15
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    24115
Absorption 0.1% (=1 g/l)    1.670,   assuming all pairs of CYS residues form cystines

Ext. coefficient    23490
Absorption 0.1% (=1 g/l)    1.627,   assuming all CYS residues are reduced
Aromaticity:0.054

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 51.15

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[25.38, 22.31, 22.31]

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:77.2308
Grand average of hydropathicity (GRAVY):-0.26