Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1985
Number of amino acids:33
Molecular Weight:3489.9 Da
Theoretical pI:4.68


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)13.03%
Glycine GLY (G)721.21%
Phynylalanine PHE (F)26.06%
Isoleucine ILE (I)13.03%
Histidine HIS (H)00%
Lysine LYS (K)26.06%
Methionine MET (M)00%
Leucine LEU (L)13.03%
Asparagine ASN (N)13.03%
Glutamine GLN (Q)13.03%
Proline PRO (P)00%
Serine SER (S)26.06%
Arginine ARG (R)00%
Threonine THR (T)39.09%
Tryptophan TRP (W)13.03%
Valine VAL (V)00%
Tyrosine TYR (Y)26.06%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC147
HydrogenH214
NitrogenN38
OxygenO49
SulphurS6

FormulaC147H214N38O49S6
Total Number of Atoms:454


Total number of positively charged residues (ARG + LYS):2
Total number of negatively charged residues (ASP + GLU):3
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    8855
Absorption 0.1% (=1 g/l)    2.537,   assuming all pairs of CYS residues form cystines

Ext. coefficient    8480
Absorption 0.1% (=1 g/l)    2.430,   assuming all CYS residues are reduced
Aromaticity:0.152

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 32.34

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[21.21, 30.30, 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:26.6666
Grand average of hydropathicity (GRAVY):-0.14