Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4694
Number of amino acids:494
Molecular Weight:55019.45 Da
Theoretical pI:6.35


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)418.3%
Cysteine CYS (C)61.21%
Glutamic Acid GLU (E)214.25%
Aspartic Acid ASP (D)265.26%
Glycine GLY (G)346.88%
Phynylalanine PHE (F)244.86%
Isoleucine ILE (I)224.45%
Histidine HIS (H)91.82%
Lysine LYS (K)234.66%
Methionine MET (M)112.23%
Leucine LEU (L)499.92%
Asparagine ASN (N)295.87%
Glutamine GLN (Q)132.63%
Proline PRO (P)336.68%
Serine SER (S)408.1%
Arginine ARG (R)214.25%
Threonine THR (T)295.87%
Tryptophan TRP (W)91.82%
Valine VAL (V)275.47%
Tyrosine TYR (Y)275.47%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC2492
HydrogenH3791
NitrogenN649
OxygenO727
SulphurS17

FormulaC2492H3791N649O727S17
Total Number of Atoms:7676


Total number of positively charged residues (ARG + LYS):44
Total number of negatively charged residues (ASP + GLU):47
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    90105
Absorption 0.1% (=1 g/l)    1.638,   assuming all pairs of CYS residues form cystines

Ext. coefficient    89730
Absorption 0.1% (=1 g/l)    1.631,   assuming all CYS residues are reduced
Aromaticity:0.121

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 40.88

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[31.98, 27.53, 24.70]

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:80.2024
Grand average of hydropathicity (GRAVY):-0.22