Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5909
Number of amino acids:80
Molecular Weight:8734.28 Da
Theoretical pI:8.49


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)1215%
Cysteine CYS (C)810%
Glutamic Acid GLU (E)45%
Aspartic Acid ASP (D)00%
Glycine GLY (G)45%
Phynylalanine PHE (F)67.5%
Isoleucine ILE (I)45%
Histidine HIS (H)22.5%
Lysine LYS (K)56.25%
Methionine MET (M)22.5%
Leucine LEU (L)67.5%
Asparagine ASN (N)67.5%
Glutamine GLN (Q)22.5%
Proline PRO (P)45%
Serine SER (S)45%
Arginine ARG (R)22.5%
Threonine THR (T)22.5%
Tryptophan TRP (W)11.25%
Valine VAL (V)45%
Tyrosine TYR (Y)22.5%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC389
HydrogenH600
NitrogenN104
OxygenO105
SulphurS10

FormulaC389H600N104O105S10
Total Number of Atoms:1208


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    8980
Absorption 0.1% (=1 g/l)    1.028,   assuming all pairs of CYS residues form cystines

Ext. coefficient    8480
Absorption 0.1% (=1 g/l)    0.971,   assuming all CYS residues are reduced
Aromaticity:0.113

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 34.62

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.75, 22.50, 30.00]

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:78.25
Grand average of hydropathicity (GRAVY):0.34