Physicochemical Properties of Peptide



PPepDB ID:PPepDB_709
Number of amino acids:178
Molecular Weight:18768.79 Da
Theoretical pI:6.73


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)158.43%
Cysteine CYS (C)126.74%
Glutamic Acid GLU (E)116.18%
Aspartic Acid ASP (D)42.25%
Glycine GLY (G)126.74%
Phynylalanine PHE (F)73.93%
Isoleucine ILE (I)179.55%
Histidine HIS (H)10.56%
Lysine LYS (K)126.74%
Methionine MET (M)10.56%
Leucine LEU (L)158.43%
Asparagine ASN (N)147.87%
Glutamine GLN (Q)21.12%
Proline PRO (P)73.93%
Serine SER (S)168.99%
Arginine ARG (R)31.69%
Threonine THR (T)137.3%
Tryptophan TRP (W)00%
Valine VAL (V)147.87%
Tyrosine TYR (Y)21.12%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC821
HydrogenH1345
NitrogenN217
OxygenO256
SulphurS13

FormulaC821H1345N217O256S13
Total Number of Atoms:2652


Total number of positively charged residues (ARG + LYS):15
Total number of negatively charged residues (ASP + GLU):15
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    3730
Absorption 0.1% (=1 g/l)    0.199,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.159,   assuming all CYS residues are reduced
Aromaticity:0.051

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 23.12

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[30.90, 27.53, 23.60]

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:101.348
Grand average of hydropathicity (GRAVY):0.33