Physicochemical Properties of Peptide



PPepDB ID:PPepDB_3633
Number of amino acids:16
Molecular Weight:1680.81 Da
Theoretical pI:5.29


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)16.25%
Cysteine CYS (C)16.25%
Glutamic Acid GLU (E)16.25%
Aspartic Acid ASP (D)16.25%
Glycine GLY (G)318.75%
Phynylalanine PHE (F)212.5%
Isoleucine ILE (I)00%
Histidine HIS (H)16.25%
Lysine LYS (K)00%
Methionine MET (M)00%
Leucine LEU (L)00%
Asparagine ASN (N)00%
Glutamine GLN (Q)00%
Proline PRO (P)16.25%
Serine SER (S)16.25%
Arginine ARG (R)16.25%
Threonine THR (T)212.5%
Tryptophan TRP (W)00%
Valine VAL (V)16.25%
Tyrosine TYR (Y)00%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC72
HydrogenH105
NitrogenN21
OxygenO24
SulphurS1

FormulaC72H105N21O24S1
Total Number of Atoms:223


Total number of positively charged residues (ARG + LYS):1
Total number of negatively charged residues (ASP + GLU):2
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    0
Absorption 0.1% (=1 g/l)    0.000,   assuming all pairs of CYS residues form cystines

Ext. coefficient    0
Absorption 0.1% (=1 g/l)    0.000,   assuming all CYS residues are reduced
Aromaticity:0.125

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 55.84

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[18.75, 31.25, 12.50]

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:24.375
Grand average of hydropathicity (GRAVY):-0.35