Physicochemical Properties of Peptide



PPepDB ID:PPepDB_902
Number of amino acids:137
Molecular Weight:14667.07 Da
Theoretical pI:7.88


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)107.3%
Cysteine CYS (C)1510.95%
Glutamic Acid GLU (E)64.38%
Aspartic Acid ASP (D)64.38%
Glycine GLY (G)118.03%
Phynylalanine PHE (F)42.92%
Isoleucine ILE (I)75.11%
Histidine HIS (H)10.73%
Lysine LYS (K)85.84%
Methionine MET (M)42.92%
Leucine LEU (L)96.57%
Asparagine ASN (N)85.84%
Glutamine GLN (Q)53.65%
Proline PRO (P)75.11%
Serine SER (S)118.03%
Arginine ARG (R)64.38%
Threonine THR (T)42.92%
Tryptophan TRP (W)00%
Valine VAL (V)128.76%
Tyrosine TYR (Y)32.19%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC621
HydrogenH1010
NitrogenN178
OxygenO193
SulphurS19

FormulaC621H1010N178O193S19
Total Number of Atoms:2021


Total number of positively charged residues (ARG + LYS):14
Total number of negatively charged residues (ASP + GLU):12
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    5345
Absorption 0.1% (=1 g/l)    0.364,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    0.305,   assuming all CYS residues are reduced
Aromaticity:0.051

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 42.65

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[25.55, 27.01, 21.17]

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:78.2482
Grand average of hydropathicity (GRAVY):0.08