Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1027
Number of amino acids:248
Molecular Weight:25412.02 Da
Theoretical pI:8.78


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)3413.71%
Cysteine CYS (C)166.45%
Glutamic Acid GLU (E)41.61%
Aspartic Acid ASP (D)83.23%
Glycine GLY (G)3514.11%
Phynylalanine PHE (F)52.02%
Isoleucine ILE (I)83.23%
Histidine HIS (H)20.81%
Lysine LYS (K)62.42%
Methionine MET (M)31.21%
Leucine LEU (L)208.06%
Asparagine ASN (N)62.42%
Glutamine GLN (Q)83.23%
Proline PRO (P)176.85%
Serine SER (S)176.85%
Arginine ARG (R)145.65%
Threonine THR (T)176.85%
Tryptophan TRP (W)31.21%
Valine VAL (V)135.24%
Tyrosine TYR (Y)124.84%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC1106
HydrogenH1737
NitrogenN317
OxygenO333
SulphurS19

FormulaC1106H1737N317O333S19
Total Number of Atoms:3512


Total number of positively charged residues (ARG + LYS):20
Total number of negatively charged residues (ASP + GLU):12
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    35380
Absorption 0.1% (=1 g/l)    1.392,   assuming all pairs of CYS residues form cystines

Ext. coefficient    34380
Absorption 0.1% (=1 g/l)    1.353,   assuming all CYS residues are reduced
Aromaticity:0.081

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 42.00

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[24.60, 30.24, 24.60]

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:72.9436
Grand average of hydropathicity (GRAVY):0.07