Physicochemical Properties of Peptide



PPepDB ID:PPepDB_955
Number of amino acids:248
Molecular Weight:26245.91 Da
Theoretical pI:7.5


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)2610.48%
Cysteine CYS (C)176.85%
Glutamic Acid GLU (E)104.03%
Aspartic Acid ASP (D)72.82%
Glycine GLY (G)2610.48%
Phynylalanine PHE (F)104.03%
Isoleucine ILE (I)31.21%
Histidine HIS (H)114.44%
Lysine LYS (K)72.82%
Methionine MET (M)31.21%
Leucine LEU (L)2510.08%
Asparagine ASN (N)104.03%
Glutamine GLN (Q)72.82%
Proline PRO (P)208.06%
Serine SER (S)187.26%
Arginine ARG (R)114.44%
Threonine THR (T)145.65%
Tryptophan TRP (W)31.21%
Valine VAL (V)145.65%
Tyrosine TYR (Y)62.42%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1148
HydrogenH1772
NitrogenN330
OxygenO338
SulphurS20

FormulaC1148H1772N330O338S20
Total Number of Atoms:3608


Total number of positively charged residues (ARG + LYS):18
Total number of negatively charged residues (ASP + GLU):17
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    26440
Absorption 0.1% (=1 g/l)    1.007,   assuming all pairs of CYS residues form cystines

Ext. coefficient    25440
Absorption 0.1% (=1 g/l)    0.969,   assuming all CYS residues are reduced
Aromaticity:0.077

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 47.38

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[24.60, 29.84, 25.81]

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:70.887
Grand average of hydropathicity (GRAVY):-0.07