Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5156
Number of amino acids:437
Molecular Weight:49755.71 Da
Theoretical pI:6.51


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)122.75%
Cysteine CYS (C)102.29%
Glutamic Acid GLU (E)245.49%
Aspartic Acid ASP (D)184.12%
Glycine GLY (G)327.32%
Phynylalanine PHE (F)214.81%
Isoleucine ILE (I)409.15%
Histidine HIS (H)173.89%
Lysine LYS (K)265.95%
Methionine MET (M)92.06%
Leucine LEU (L)358.01%
Asparagine ASN (N)265.95%
Glutamine GLN (Q)132.97%
Proline PRO (P)265.95%
Serine SER (S)439.84%
Arginine ARG (R)122.75%
Threonine THR (T)194.35%
Tryptophan TRP (W)92.06%
Valine VAL (V)204.58%
Tyrosine TYR (Y)255.72%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC2264
HydrogenH3421
NitrogenN581
OxygenO648
SulphurS19

FormulaC2264H3421N581O648S19
Total Number of Atoms:6933


Total number of positively charged residues (ARG + LYS):38
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    87375
Absorption 0.1% (=1 g/l)    1.756,   assuming all pairs of CYS residues form cystines

Ext. coefficient    86750
Absorption 0.1% (=1 g/l)    1.744,   assuming all CYS residues are reduced
Aromaticity:0.126

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 43.97

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[34.32, 29.06, 18.31]

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:82.9519
Grand average of hydropathicity (GRAVY):-0.27