Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5539
Number of amino acids:207
Molecular Weight:21514.06 Da
Theoretical pI:8.68


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)2311.11%
Cysteine CYS (C)20.97%
Glutamic Acid GLU (E)31.45%
Aspartic Acid ASP (D)62.9%
Glycine GLY (G)188.7%
Phynylalanine PHE (F)157.25%
Isoleucine ILE (I)125.8%
Histidine HIS (H)41.93%
Lysine LYS (K)73.38%
Methionine MET (M)31.45%
Leucine LEU (L)2612.56%
Asparagine ASN (N)83.86%
Glutamine GLN (Q)73.38%
Proline PRO (P)157.25%
Serine SER (S)178.21%
Arginine ARG (R)41.93%
Threonine THR (T)188.7%
Tryptophan TRP (W)00%
Valine VAL (V)178.21%
Tyrosine TYR (Y)20.97%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC986
HydrogenH1563
NitrogenN249
OxygenO278
SulphurS5

FormulaC986H1563N249O278S5
Total Number of Atoms:3081


Total number of positively charged residues (ARG + LYS):11
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    3105
Absorption 0.1% (=1 g/l)    0.144,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.139,   assuming all CYS residues are reduced
Aromaticity:0.082

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 26.87

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[34.78, 28.02, 26.57]

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:106.522
Grand average of hydropathicity (GRAVY):0.56