Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1135
Number of amino acids:79
Molecular Weight:8603.28 Da
Theoretical pI:6.52


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)78.86%
Cysteine CYS (C)67.59%
Glutamic Acid GLU (E)45.06%
Aspartic Acid ASP (D)22.53%
Glycine GLY (G)56.33%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)45.06%
Histidine HIS (H)11.27%
Lysine LYS (K)11.27%
Methionine MET (M)56.33%
Leucine LEU (L)911.39%
Asparagine ASN (N)56.33%
Glutamine GLN (Q)33.8%
Proline PRO (P)56.33%
Serine SER (S)00%
Arginine ARG (R)56.33%
Threonine THR (T)56.33%
Tryptophan TRP (W)00%
Valine VAL (V)1012.66%
Tyrosine TYR (Y)22.53%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC370
HydrogenH619
NitrogenN105
OxygenO107
SulphurS11

FormulaC370H619N105O107S11
Total Number of Atoms:1212


Total number of positively charged residues (ARG + LYS):6
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    3355
Absorption 0.1% (=1 g/l)    0.390,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.346,   assuming all CYS residues are reduced
Aromaticity:0.025

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 18.88

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[31.65, 18.99, 31.65]

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:109.747
Grand average of hydropathicity (GRAVY):0.46