Physicochemical Properties of Peptide



PPepDB ID:PPepDB_3985
Number of amino acids:28
Molecular Weight:2910.33 Da
Theoretical pI:5.96


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)13.57%
Cysteine CYS (C)621.43%
Glutamic Acid GLU (E)13.57%
Aspartic Acid ASP (D)00%
Glycine GLY (G)310.71%
Phynylalanine PHE (F)27.14%
Isoleucine ILE (I)00%
Histidine HIS (H)00%
Lysine LYS (K)13.57%
Methionine MET (M)00%
Leucine LEU (L)13.57%
Asparagine ASN (N)13.57%
Glutamine GLN (Q)13.57%
Proline PRO (P)13.57%
Serine SER (S)310.71%
Arginine ARG (R)00%
Threonine THR (T)414.29%
Tryptophan TRP (W)00%
Valine VAL (V)27.14%
Tyrosine TYR (Y)13.57%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC120
HydrogenH185
NitrogenN31
OxygenO41
SulphurS6

FormulaC120H185N31O41S6
Total Number of Atoms:383


Total number of positively charged residues (ARG + LYS):1
Total number of negatively charged residues (ASP + GLU):1
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    1865
Absorption 0.1% (=1 g/l)    0.641,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.512,   assuming all CYS residues are reduced
Aromaticity:0.107

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 68.27

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[21.43, 28.57, 10.71]

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:38.2143
Grand average of hydropathicity (GRAVY):0.39