Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6080
Number of amino acids:240
Molecular Weight:26254.64 Da
Theoretical pI:8.41


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)3313.75%
Cysteine CYS (C)41.67%
Glutamic Acid GLU (E)10.42%
Aspartic Acid ASP (D)10.42%
Glycine GLY (G)20.83%
Phynylalanine PHE (F)125%
Isoleucine ILE (I)135.42%
Histidine HIS (H)10.42%
Lysine LYS (K)10.42%
Methionine MET (M)20.83%
Leucine LEU (L)4820%
Asparagine ASN (N)114.58%
Glutamine GLN (Q)4317.92%
Proline PRO (P)218.75%
Serine SER (S)208.33%
Arginine ARG (R)31.25%
Threonine THR (T)93.75%
Tryptophan TRP (W)00%
Valine VAL (V)72.92%
Tyrosine TYR (Y)83.33%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1205
HydrogenH1912
NitrogenN306
OxygenO336
SulphurS6

FormulaC1205H1912N306O336S6
Total Number of Atoms:3765


Total number of positively charged residues (ARG + LYS):4
Total number of negatively charged residues (ASP + GLU):2
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    12170
Absorption 0.1% (=1 g/l)    0.464,   assuming all pairs of CYS residues form cystines

Ext. coefficient    11920
Absorption 0.1% (=1 g/l)    0.454,   assuming all CYS residues are reduced
Aromaticity:0.083

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 70.44

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[36.67, 22.50, 35.00]

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:121.333
Grand average of hydropathicity (GRAVY):0.39