Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6131
Number of amino acids:319
Molecular Weight:36666.11 Da
Theoretical pI:6.98


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)165.02%
Cysteine CYS (C)61.88%
Glutamic Acid GLU (E)41.25%
Aspartic Acid ASP (D)10.31%
Glycine GLY (G)41.25%
Phynylalanine PHE (F)113.45%
Isoleucine ILE (I)154.7%
Histidine HIS (H)61.88%
Lysine LYS (K)20.63%
Methionine MET (M)30.94%
Leucine LEU (L)278.46%
Asparagine ASN (N)72.19%
Glutamine GLN (Q)12037.62%
Proline PRO (P)4413.79%
Serine SER (S)185.64%
Arginine ARG (R)30.94%
Threonine THR (T)103.13%
Tryptophan TRP (W)00%
Valine VAL (V)144.39%
Tyrosine TYR (Y)82.51%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1614
HydrogenH2515
NitrogenN469
OxygenO493
SulphurS9

FormulaC1614H2515N469O493S9
Total Number of Atoms:5100


Total number of positively charged residues (ARG + LYS):5
Total number of negatively charged residues (ASP + GLU):5
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    12295
Absorption 0.1% (=1 g/l)    0.335,   assuming all pairs of CYS residues form cystines

Ext. coefficient    11920
Absorption 0.1% (=1 g/l)    0.325,   assuming all CYS residues are reduced
Aromaticity:0.060

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 120.34

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[23.51, 22.88, 15.67]

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:69.0909
Grand average of hydropathicity (GRAVY):-0.93