Physicochemical Properties of Peptide



PPepDB ID:PPepDB_4628
Number of amino acids:266
Molecular Weight:27930.67 Da
Theoretical pI:8.73


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)4215.79%
Cysteine CYS (C)93.38%
Glutamic Acid GLU (E)31.13%
Aspartic Acid ASP (D)103.76%
Glycine GLY (G)3513.16%
Phynylalanine PHE (F)103.76%
Isoleucine ILE (I)62.26%
Histidine HIS (H)31.13%
Lysine LYS (K)51.88%
Methionine MET (M)103.76%
Leucine LEU (L)155.64%
Asparagine ASN (N)83.01%
Glutamine GLN (Q)83.01%
Proline PRO (P)124.51%
Serine SER (S)155.64%
Arginine ARG (R)134.89%
Threonine THR (T)259.4%
Tryptophan TRP (W)93.38%
Valine VAL (V)155.64%
Tyrosine TYR (Y)134.89%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1238
HydrogenH1869
NitrogenN341
OxygenO362
SulphurS19

FormulaC1238H1869N341O362S19
Total Number of Atoms:3829


Total number of positively charged residues (ARG + LYS):18
Total number of negatively charged residues (ASP + GLU):13
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    69370
Absorption 0.1% (=1 g/l)    2.484,   assuming all pairs of CYS residues form cystines

Ext. coefficient    68870
Absorption 0.1% (=1 g/l)    2.466,   assuming all CYS residues are reduced
Aromaticity:0.120

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 21.45

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[25.56, 26.32, 26.32]

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:62.9324
Grand average of hydropathicity (GRAVY):0.06