Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4919
Number of amino acids:111
Molecular Weight:11620.31 Da
Theoretical pI:6.32


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)98.11%
Cysteine CYS (C)1210.81%
Glutamic Acid GLU (E)43.6%
Aspartic Acid ASP (D)65.41%
Glycine GLY (G)87.21%
Phynylalanine PHE (F)10.9%
Isoleucine ILE (I)32.7%
Histidine HIS (H)00%
Lysine LYS (K)54.5%
Methionine MET (M)10.9%
Leucine LEU (L)1210.81%
Asparagine ASN (N)54.5%
Glutamine GLN (Q)32.7%
Proline PRO (P)54.5%
Serine SER (S)1311.71%
Arginine ARG (R)54.5%
Threonine THR (T)87.21%
Tryptophan TRP (W)00%
Valine VAL (V)87.21%
Tyrosine TYR (Y)32.7%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC485
HydrogenH801
NitrogenN139
OxygenO164
SulphurS13

FormulaC485H801N139O164S13
Total Number of Atoms:1602


Total number of positively charged residues (ARG + LYS):10
Total number of negatively charged residues (ASP + GLU):10
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    5220
Absorption 0.1% (=1 g/l)    0.449,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    0.385,   assuming all CYS residues are reduced
Aromaticity:0.036

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 36.78

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[24.32, 27.93, 23.42]

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:81.7117
Grand average of hydropathicity (GRAVY):0.07