Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6071
Number of amino acids:63
Molecular Weight:6690.74 Da
Theoretical pI:4.75


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)23.17%
Cysteine CYS (C)69.52%
Glutamic Acid GLU (E)34.76%
Aspartic Acid ASP (D)69.52%
Glycine GLY (G)812.7%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)57.94%
Histidine HIS (H)11.59%
Lysine LYS (K)23.17%
Methionine MET (M)46.35%
Leucine LEU (L)57.94%
Asparagine ASN (N)23.17%
Glutamine GLN (Q)00%
Proline PRO (P)34.76%
Serine SER (S)69.52%
Arginine ARG (R)46.35%
Threonine THR (T)11.59%
Tryptophan TRP (W)00%
Valine VAL (V)46.35%
Tyrosine TYR (Y)11.59%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC275
HydrogenH457
NitrogenN81
OxygenO92
SulphurS10

FormulaC275H457N81O92S10
Total Number of Atoms:915


Total number of positively charged residues (ARG + LYS):6
Total number of negatively charged residues (ASP + GLU):9
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)    0.279,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.223,   assuming all CYS residues are reduced
Aromaticity:0.016

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 50.20

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[23.81, 30.16, 22.22]

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:83.4921
Grand average of hydropathicity (GRAVY):0.04