Physicochemical Properties of Peptide



PPepDB ID:PPepDB_852
Number of amino acids:121
Molecular Weight:13015.36 Da
Theoretical pI:7.5


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)108.26%
Cysteine CYS (C)86.61%
Glutamic Acid GLU (E)86.61%
Aspartic Acid ASP (D)43.31%
Glycine GLY (G)97.44%
Phynylalanine PHE (F)54.13%
Isoleucine ILE (I)21.65%
Histidine HIS (H)10.83%
Lysine LYS (K)108.26%
Methionine MET (M)43.31%
Leucine LEU (L)1714.05%
Asparagine ASN (N)32.48%
Glutamine GLN (Q)43.31%
Proline PRO (P)43.31%
Serine SER (S)64.96%
Arginine ARG (R)32.48%
Threonine THR (T)129.92%
Tryptophan TRP (W)10.83%
Valine VAL (V)108.26%
Tyrosine TYR (Y)00%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC570
HydrogenH940
NitrogenN150
OxygenO171
SulphurS12

FormulaC570H940N150O171S12
Total Number of Atoms:1843


Total number of positively charged residues (ARG + LYS):13
Total number of negatively charged residues (ASP + GLU):12
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    6000
Absorption 0.1% (=1 g/l)    0.461,   assuming all pairs of CYS residues form cystines

Ext. coefficient    5500
Absorption 0.1% (=1 g/l)    0.423,   assuming all CYS residues are reduced
Aromaticity:0.050

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 45.61

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.93, 18.18, 32.23]

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:93.4711
Grand average of hydropathicity (GRAVY):0.24