Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2661
Number of amino acids:43
Molecular Weight:4781.34 Da
Theoretical pI:4


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)49.3%
Cysteine CYS (C)12.33%
Glutamic Acid GLU (E)511.63%
Aspartic Acid ASP (D)24.65%
Glycine GLY (G)24.65%
Phynylalanine PHE (F)36.98%
Isoleucine ILE (I)24.65%
Histidine HIS (H)12.33%
Lysine LYS (K)00%
Methionine MET (M)12.33%
Leucine LEU (L)511.63%
Asparagine ASN (N)00%
Glutamine GLN (Q)24.65%
Proline PRO (P)24.65%
Serine SER (S)49.3%
Arginine ARG (R)12.33%
Threonine THR (T)49.3%
Tryptophan TRP (W)00%
Valine VAL (V)24.65%
Tyrosine TYR (Y)24.65%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC214
HydrogenH324
NitrogenN50
OxygenO70
SulphurS2

FormulaC214H324N50O70S2
Total Number of Atoms:660


Total number of positively charged residues (ARG + LYS):1
Total number of negatively charged residues (ASP + GLU):7
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    2980
Absorption 0.1% (=1 g/l)    0.623,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.623,   assuming all CYS residues are reduced
Aromaticity:0.116

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 58.59

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[32.56, 18.60, 34.88]

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:86.279
Grand average of hydropathicity (GRAVY):0.11