Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6105
Number of amino acids:77
Molecular Weight:8479.23 Da
Theoretical pI:7.52


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)56.49%
Cysteine CYS (C)911.69%
Glutamic Acid GLU (E)33.9%
Aspartic Acid ASP (D)22.6%
Glycine GLY (G)79.09%
Phynylalanine PHE (F)67.79%
Isoleucine ILE (I)810.39%
Histidine HIS (H)33.9%
Lysine LYS (K)67.79%
Methionine MET (M)56.49%
Leucine LEU (L)67.79%
Asparagine ASN (N)11.3%
Glutamine GLN (Q)11.3%
Proline PRO (P)45.19%
Serine SER (S)56.49%
Arginine ARG (R)00%
Threonine THR (T)22.6%
Tryptophan TRP (W)00%
Valine VAL (V)11.3%
Tyrosine TYR (Y)33.9%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC380
HydrogenH587
NitrogenN91
OxygenO100
SulphurS14

FormulaC380H587N91O100S14
Total Number of Atoms:1172


Total number of positively charged residues (ARG + LYS):6
Total number of negatively charged residues (ASP + GLU):5
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)    0.586,   assuming all pairs of CYS residues form cystines

Ext. coefficient    4470
Absorption 0.1% (=1 g/l)    0.527,   assuming all CYS residues are reduced
Aromaticity:0.117

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 35.98

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[31.17, 22.08, 24.68]

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:81.1688
Grand average of hydropathicity (GRAVY):0.58