Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4192
Number of amino acids:255
Molecular Weight:27748.89 Da
Theoretical pI:4.96


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)187.06%
Cysteine CYS (C)103.92%
Glutamic Acid GLU (E)83.14%
Aspartic Acid ASP (D)145.49%
Glycine GLY (G)3212.55%
Phynylalanine PHE (F)166.27%
Isoleucine ILE (I)114.31%
Histidine HIS (H)51.96%
Lysine LYS (K)51.96%
Methionine MET (M)31.18%
Leucine LEU (L)207.84%
Asparagine ASN (N)176.67%
Glutamine GLN (Q)155.88%
Proline PRO (P)114.31%
Serine SER (S)197.45%
Arginine ARG (R)93.53%
Threonine THR (T)145.49%
Tryptophan TRP (W)72.75%
Valine VAL (V)124.71%
Tyrosine TYR (Y)93.53%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1232
HydrogenH1830
NitrogenN336
OxygenO374
SulphurS13

FormulaC1232H1830N336O374S13
Total Number of Atoms:3785


Total number of positively charged residues (ARG + LYS):14
Total number of negatively charged residues (ASP + GLU):22
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    52535
Absorption 0.1% (=1 g/l)    1.893,   assuming all pairs of CYS residues form cystines

Ext. coefficient    51910
Absorption 0.1% (=1 g/l)    1.871,   assuming all CYS residues are reduced
Aromaticity:0.125

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 33.52

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[29.41, 30.98, 19.22]

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:68.1177
Grand average of hydropathicity (GRAVY):-0.21