Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4922
Number of amino acids:335
Molecular Weight:36183.7 Da
Theoretical pI:7.87


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)329.55%
Cysteine CYS (C)175.07%
Glutamic Acid GLU (E)102.99%
Aspartic Acid ASP (D)154.48%
Glycine GLY (G)4112.24%
Phynylalanine PHE (F)175.07%
Isoleucine ILE (I)144.18%
Histidine HIS (H)41.19%
Lysine LYS (K)123.58%
Methionine MET (M)51.49%
Leucine LEU (L)226.57%
Asparagine ASN (N)205.97%
Glutamine GLN (Q)175.07%
Proline PRO (P)247.16%
Serine SER (S)205.97%
Arginine ARG (R)154.48%
Threonine THR (T)195.67%
Tryptophan TRP (W)82.39%
Valine VAL (V)92.69%
Tyrosine TYR (Y)144.18%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1599
HydrogenH2405
NitrogenN445
OxygenO476
SulphurS22

FormulaC1599H2405N445O476S22
Total Number of Atoms:4947


Total number of positively charged residues (ARG + LYS):27
Total number of negatively charged residues (ASP + GLU):25
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    65860
Absorption 0.1% (=1 g/l)    1.820,   assuming all pairs of CYS residues form cystines

Ext. coefficient    64860
Absorption 0.1% (=1 g/l)    1.793,   assuming all CYS residues are reduced
Aromaticity:0.116

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 37.44

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[25.07, 31.34, 20.60]

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:59.2537
Grand average of hydropathicity (GRAVY):-0.33