Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5956
Number of amino acids:126
Molecular Weight:12653.7 Da
Theoretical pI:10.64


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)3023.81%
Cysteine CYS (C)64.76%
Glutamic Acid GLU (E)43.17%
Aspartic Acid ASP (D)00%
Glycine GLY (G)107.94%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)21.59%
Histidine HIS (H)10.79%
Lysine LYS (K)10.79%
Methionine MET (M)10.79%
Leucine LEU (L)1310.32%
Asparagine ASN (N)10.79%
Glutamine GLN (Q)21.59%
Proline PRO (P)1310.32%
Serine SER (S)107.94%
Arginine ARG (R)129.52%
Threonine THR (T)97.14%
Tryptophan TRP (W)32.38%
Valine VAL (V)75.56%
Tyrosine TYR (Y)10.79%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC549
HydrogenH905
NitrogenN171
OxygenO158
SulphurS7

FormulaC549H905N171O158S7
Total Number of Atoms:1790


Total number of positively charged residues (ARG + LYS):13
Total number of negatively charged residues (ASP + GLU):4
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    18365
Absorption 0.1% (=1 g/l)    1.451,   assuming all pairs of CYS residues form cystines

Ext. coefficient    17990
Absorption 0.1% (=1 g/l)    1.422,   assuming all CYS residues are reduced
Aromaticity:0.032

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 70.94

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[20.63, 26.98, 38.10]

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:86.3493
Grand average of hydropathicity (GRAVY):0.24