Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5681
Number of amino acids:320
Molecular Weight:35152.69 Da
Theoretical pI:8.9


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)185.63%
Cysteine CYS (C)30.94%
Glutamic Acid GLU (E)185.63%
Aspartic Acid ASP (D)123.75%
Glycine GLY (G)247.5%
Phynylalanine PHE (F)113.44%
Isoleucine ILE (I)278.44%
Histidine HIS (H)20.63%
Lysine LYS (K)257.81%
Methionine MET (M)30.94%
Leucine LEU (L)278.44%
Asparagine ASN (N)226.88%
Glutamine GLN (Q)165%
Proline PRO (P)278.44%
Serine SER (S)165%
Arginine ARG (R)103.13%
Threonine THR (T)144.38%
Tryptophan TRP (W)10.31%
Valine VAL (V)3210%
Tyrosine TYR (Y)123.75%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1595
HydrogenH2552
NitrogenN418
OxygenO461
SulphurS6

FormulaC1595H2552N418O461S6
Total Number of Atoms:5032


Total number of positively charged residues (ARG + LYS):35
Total number of negatively charged residues (ASP + GLU):30
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    23505
Absorption 0.1% (=1 g/l)    0.669,   assuming all pairs of CYS residues form cystines

Ext. coefficient    23380
Absorption 0.1% (=1 g/l)    0.665,   assuming all CYS residues are reduced
Aromaticity:0.075

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 26.90

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[34.38, 27.81, 20.62]

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:100.438
Grand average of hydropathicity (GRAVY):-0.14