Physicochemical Properties of Peptide



PPepDB ID:PPepDB_1099
Number of amino acids:135
Molecular Weight:14259.4 Da
Theoretical pI:6.22


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)64.44%
Cysteine CYS (C)128.89%
Glutamic Acid GLU (E)85.93%
Aspartic Acid ASP (D)42.96%
Glycine GLY (G)128.89%
Phynylalanine PHE (F)32.22%
Isoleucine ILE (I)64.44%
Histidine HIS (H)00%
Lysine LYS (K)96.67%
Methionine MET (M)21.48%
Leucine LEU (L)107.41%
Asparagine ASN (N)42.96%
Glutamine GLN (Q)64.44%
Proline PRO (P)32.22%
Serine SER (S)1611.85%
Arginine ARG (R)32.22%
Threonine THR (T)128.89%
Tryptophan TRP (W)00%
Valine VAL (V)1511.11%
Tyrosine TYR (Y)42.96%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC607
HydrogenH997
NitrogenN163
OxygenO202
SulphurS14

FormulaC607H997N163O202S14
Total Number of Atoms:1983


Total number of positively charged residues (ARG + LYS):12
Total number of negatively charged residues (ASP + GLU):12
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    6710
Absorption 0.1% (=1 g/l)    0.471,   assuming all pairs of CYS residues form cystines

Ext. coefficient    5960
Absorption 0.1% (=1 g/l)    0.418,   assuming all CYS residues are reduced
Aromaticity:0.052

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 31.28

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.15, 25.93, 19.26]

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:82.8888
Grand average of hydropathicity (GRAVY):0.14