Physicochemical Properties of Peptide



PPepDB ID:PPepDB_671
Number of amino acids:27
Molecular Weight:2946.54 Da
Theoretical pI:8.33


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)00%
Cysteine CYS (C)622.22%
Glutamic Acid GLU (E)13.7%
Aspartic Acid ASP (D)00%
Glycine GLY (G)311.11%
Phynylalanine PHE (F)27.41%
Isoleucine ILE (I)27.41%
Histidine HIS (H)00%
Lysine LYS (K)27.41%
Methionine MET (M)00%
Leucine LEU (L)27.41%
Asparagine ASN (N)13.7%
Glutamine GLN (Q)00%
Proline PRO (P)13.7%
Serine SER (S)27.41%
Arginine ARG (R)13.7%
Threonine THR (T)27.41%
Tryptophan TRP (W)00%
Valine VAL (V)13.7%
Tyrosine TYR (Y)13.7%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC126
HydrogenH201
NitrogenN33
OxygenO36
SulphurS6

FormulaC126H201N33O36S6
Total Number of Atoms:402


Total number of positively charged residues (ARG + LYS):3
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)    0.633,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.506,   assuming all CYS residues are reduced
Aromaticity:0.111

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 23.03

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[29.63, 25.93, 11.11]

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:68.5185
Grand average of hydropathicity (GRAVY):0.56