Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2476
Number of amino acids:33
Molecular Weight:3579.14 Da
Theoretical pI:4.78


Amino Acid Composition:


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


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC149
HydrogenH233
NitrogenN39
OxygenO49
SulphurS7

FormulaC149H233N39O49S7
Total Number of Atoms:477


Total number of positively charged residues (ARG + LYS):3
Total number of negatively charged residues (ASP + GLU):4
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)    0.937,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.833,   assuming all CYS residues are reduced
Aromaticity:0.091

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 40.44

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[24.24, 24.24, 12.12]

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:49.9999
Grand average of hydropathicity (GRAVY):0.09