Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4623
Number of amino acids:421
Molecular Weight:43952.99 Da
Theoretical pI:8.5


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)389.03%
Cysteine CYS (C)122.85%
Glutamic Acid GLU (E)112.61%
Aspartic Acid ASP (D)225.23%
Glycine GLY (G)429.98%
Phynylalanine PHE (F)204.75%
Isoleucine ILE (I)296.89%
Histidine HIS (H)51.19%
Lysine LYS (K)368.55%
Methionine MET (M)61.43%
Leucine LEU (L)184.28%
Asparagine ASN (N)276.41%
Glutamine GLN (Q)122.85%
Proline PRO (P)245.7%
Serine SER (S)337.84%
Arginine ARG (R)20.48%
Threonine THR (T)419.74%
Tryptophan TRP (W)51.19%
Valine VAL (V)337.84%
Tyrosine TYR (Y)51.19%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1943
HydrogenH3077
NitrogenN517
OxygenO606
SulphurS18

FormulaC1943H3077N517O606S18
Total Number of Atoms:6161


Total number of positively charged residues (ARG + LYS):38
Total number of negatively charged residues (ASP + GLU):33
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    35700
Absorption 0.1% (=1 g/l)    0.812,   assuming all pairs of CYS residues form cystines

Ext. coefficient    34950
Absorption 0.1% (=1 g/l)    0.795,   assuming all CYS residues are reduced
Aromaticity:0.071

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 22.36

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[26.13, 29.93, 17.34]

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:75.2969
Grand average of hydropathicity (GRAVY):-0.08