Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6037
Number of amino acids:76
Molecular Weight:8226.69 Da
Theoretical pI:5.48


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)45.26%
Cysteine CYS (C)911.84%
Glutamic Acid GLU (E)11.32%
Aspartic Acid ASP (D)56.58%
Glycine GLY (G)67.89%
Phynylalanine PHE (F)56.58%
Isoleucine ILE (I)79.21%
Histidine HIS (H)11.32%
Lysine LYS (K)45.26%
Methionine MET (M)22.63%
Leucine LEU (L)79.21%
Asparagine ASN (N)33.95%
Glutamine GLN (Q)11.32%
Proline PRO (P)33.95%
Serine SER (S)79.21%
Arginine ARG (R)11.32%
Threonine THR (T)33.95%
Tryptophan TRP (W)00%
Valine VAL (V)45.26%
Tyrosine TYR (Y)33.95%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC363
HydrogenH567
NitrogenN89
OxygenO106
SulphurS11

FormulaC363H567N89O106S11
Total Number of Atoms:1136


Total number of positively charged residues (ARG + LYS):5
Total number of negatively charged residues (ASP + GLU):6
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    4970
Absorption 0.1% (=1 g/l)    0.604,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    0.543,   assuming all CYS residues are reduced
Aromaticity:0.105

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 31.20

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[34.21, 25.00, 18.42]

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:92.3685
Grand average of hydropathicity (GRAVY):0.60