Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5840
Number of amino acids:145
Molecular Weight:16920.2 Da
Theoretical pI:6.17


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)85.52%
Cysteine CYS (C)106.9%
Glutamic Acid GLU (E)117.59%
Aspartic Acid ASP (D)106.9%
Glycine GLY (G)53.45%
Phynylalanine PHE (F)21.38%
Isoleucine ILE (I)53.45%
Histidine HIS (H)21.38%
Lysine LYS (K)32.07%
Methionine MET (M)96.21%
Leucine LEU (L)128.28%
Asparagine ASN (N)64.14%
Glutamine GLN (Q)2013.79%
Proline PRO (P)32.07%
Serine SER (S)106.9%
Arginine ARG (R)1711.72%
Threonine THR (T)32.07%
Tryptophan TRP (W)00%
Valine VAL (V)74.83%
Tyrosine TYR (Y)21.38%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC690
HydrogenH1143
NitrogenN229
OxygenO229
SulphurS19

FormulaC690H1143N229O229S19
Total Number of Atoms:2310


Total number of positively charged residues (ARG + LYS):20
Total number of negatively charged residues (ASP + GLU):21
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    3605
Absorption 0.1% (=1 g/l)    0.213,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.176,   assuming all CYS residues are reduced
Aromaticity:0.028

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 57.44

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[19.31, 16.55, 27.59]

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:65.2414
Grand average of hydropathicity (GRAVY):-0.82