Physicochemical Properties of Peptide



PPepDB ID:PPepDB_670
Number of amino acids:32
Molecular Weight:3540.19 Da
Theoretical pI:6.03


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)00%
Cysteine CYS (C)618.75%
Glutamic Acid GLU (E)13.13%
Aspartic Acid ASP (D)13.13%
Glycine GLY (G)26.25%
Phynylalanine PHE (F)39.38%
Isoleucine ILE (I)26.25%
Histidine HIS (H)00%
Lysine LYS (K)13.13%
Methionine MET (M)13.13%
Leucine LEU (L)26.25%
Asparagine ASN (N)26.25%
Glutamine GLN (Q)00%
Proline PRO (P)13.13%
Serine SER (S)412.5%
Arginine ARG (R)13.13%
Threonine THR (T)13.13%
Tryptophan TRP (W)00%
Valine VAL (V)39.38%
Tyrosine TYR (Y)13.13%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC152
HydrogenH236
NitrogenN38
OxygenO45
SulphurS7

FormulaC152H236N38O45S7
Total Number of Atoms:478


Total number of positively charged residues (ARG + LYS):2
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    1865
Absorption 0.1% (=1 g/l)    0.527,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.421,   assuming all CYS residues are reduced
Aromaticity:0.125

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 14.87

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[34.38, 28.12, 12.50]

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:75.9375
Grand average of hydropathicity (GRAVY):0.77