Physicochemical Properties of Peptide



PPepDB ID:PPepDB_663
Number of amino acids:33
Molecular Weight:3486.12 Da
Theoretical pI:7.76


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)26.06%
Cysteine CYS (C)618.18%
Glutamic Acid GLU (E)13.03%
Aspartic Acid ASP (D)13.03%
Glycine GLY (G)26.06%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)13.03%
Histidine HIS (H)00%
Lysine LYS (K)39.09%
Methionine MET (M)00%
Leucine LEU (L)39.09%
Asparagine ASN (N)26.06%
Glutamine GLN (Q)00%
Proline PRO (P)13.03%
Serine SER (S)39.09%
Arginine ARG (R)00%
Threonine THR (T)26.06%
Tryptophan TRP (W)00%
Valine VAL (V)412.12%
Tyrosine TYR (Y)26.06%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC147
HydrogenH242
NitrogenN38
OxygenO47
SulphurS6

FormulaC147H242N38O47S6
Total Number of Atoms:480


Total number of positively charged residues (ARG + LYS):3
Total number of negatively charged residues (ASP + GLU):2
Extinction Coefficient:This protein does not contain any Tryptophan residues. Experience shows that this could result in more than 10% error in the computed extinction coefficient.

Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    3355
Absorption 0.1% (=1 g/l)    0.962,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.855,   assuming all CYS residues are reduced
Aromaticity:0.061

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 27.44

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[30.30, 24.24, 18.18]

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:88.4848
Grand average of hydropathicity (GRAVY):0.51