Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5167
Number of amino acids:249
Molecular Weight:26430.92 Da
Theoretical pI:6.69


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)218.43%
Cysteine CYS (C)104.02%
Glutamic Acid GLU (E)20.8%
Aspartic Acid ASP (D)72.81%
Glycine GLY (G)3614.46%
Phynylalanine PHE (F)114.42%
Isoleucine ILE (I)156.02%
Histidine HIS (H)10.4%
Lysine LYS (K)31.2%
Methionine MET (M)72.81%
Leucine LEU (L)187.23%
Asparagine ASN (N)156.02%
Glutamine GLN (Q)145.62%
Proline PRO (P)104.02%
Serine SER (S)208.03%
Arginine ARG (R)62.41%
Threonine THR (T)208.03%
Tryptophan TRP (W)83.21%
Valine VAL (V)124.82%
Tyrosine TYR (Y)135.22%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1180
HydrogenH1771
NitrogenN309
OxygenO350
SulphurS17

FormulaC1180H1771N309O350S17
Total Number of Atoms:3627


Total number of positively charged residues (ARG + LYS):9
Total number of negatively charged residues (ASP + GLU):9
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    63995
Absorption 0.1% (=1 g/l)    2.421,   assuming all pairs of CYS residues form cystines

Ext. coefficient    63370
Absorption 0.1% (=1 g/l)    2.398,   assuming all CYS residues are reduced
Aromaticity:0.129

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 41.25

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[30.92, 32.53, 19.28]

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:74.0964
Grand average of hydropathicity (GRAVY):0.14