Physicochemical Properties of Peptide



PPepDB ID:PPepDB_649
Number of amino acids:27
Molecular Weight:2818.25 Da
Theoretical pI:8.29


Amino Acid Composition:


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


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC128
HydrogenH197
NitrogenN35
OxygenO35
SulphurS1

FormulaC128H197N35O35S1
Total Number of Atoms:396


Total number of positively charged residues (ARG + LYS):1
Total number of negatively charged residues (ASP + GLU):0
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    5500
Absorption 0.1% (=1 g/l)    1.952,   assuming all pairs of CYS residues form cystines

Ext. coefficient    5500
Absorption 0.1% (=1 g/l)    1.952,   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 : 40.14

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[37.04, 29.63, 14.81]

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:89.9999
Grand average of hydropathicity (GRAVY):0.61