Physicochemical Properties of Peptide



PPepDB ID:PPepDB_3466
Number of amino acids:21
Molecular Weight:2194.5 Da
Theoretical pI:4


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)00%
Cysteine CYS (C)29.52%
Glutamic Acid GLU (E)14.76%
Aspartic Acid ASP (D)00%
Glycine GLY (G)314.29%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)00%
Histidine HIS (H)00%
Lysine LYS (K)00%
Methionine MET (M)00%
Leucine LEU (L)314.29%
Asparagine ASN (N)00%
Glutamine GLN (Q)314.29%
Proline PRO (P)29.52%
Serine SER (S)14.76%
Arginine ARG (R)00%
Threonine THR (T)314.29%
Tryptophan TRP (W)00%
Valine VAL (V)29.52%
Tyrosine TYR (Y)14.76%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC94
HydrogenH152
NitrogenN24
OxygenO32
SulphurS2

FormulaC94H152N24O32S2
Total Number of Atoms:304


Total number of positively charged residues (ARG + LYS):0
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    1615
Absorption 0.1% (=1 g/l)    0.736,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.679,   assuming all CYS residues are reduced
Aromaticity:0.048

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 14.59

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.57, 28.57, 19.05]

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:83.3333
Grand average of hydropathicity (GRAVY):0.10