Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4118
Number of amino acids:454
Molecular Weight:51528.47 Da
Theoretical pI:7.75


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)275.95%
Cysteine CYS (C)61.32%
Glutamic Acid GLU (E)265.73%
Aspartic Acid ASP (D)163.52%
Glycine GLY (G)327.05%
Phynylalanine PHE (F)204.41%
Isoleucine ILE (I)245.29%
Histidine HIS (H)122.64%
Lysine LYS (K)255.51%
Methionine MET (M)102.2%
Leucine LEU (L)439.47%
Asparagine ASN (N)245.29%
Glutamine GLN (Q)132.86%
Proline PRO (P)224.85%
Serine SER (S)449.69%
Arginine ARG (R)183.96%
Threonine THR (T)286.17%
Tryptophan TRP (W)122.64%
Valine VAL (V)235.07%
Tyrosine TYR (Y)296.39%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC2342
HydrogenH3538
NitrogenN606
OxygenO677
SulphurS16

FormulaC2342H3538N606O677S16
Total Number of Atoms:7179


Total number of positively charged residues (ARG + LYS):43
Total number of negatively charged residues (ASP + GLU):42
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    109585
Absorption 0.1% (=1 g/l)    2.127,   assuming all pairs of CYS residues form cystines

Ext. coefficient    109210
Absorption 0.1% (=1 g/l)    2.119,   assuming all CYS residues are reduced
Aromaticity:0.134

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 46.39

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[33.26, 26.87, 23.35]

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:78.1938
Grand average of hydropathicity (GRAVY):-0.30