Physicochemical Properties of Peptide



PPepDB ID:PPepDB_605
Number of amino acids:191
Molecular Weight:19863.7 Da
Theoretical pI:5.86


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)2312.04%
Cysteine CYS (C)31.57%
Glutamic Acid GLU (E)42.09%
Aspartic Acid ASP (D)105.24%
Glycine GLY (G)2010.47%
Phynylalanine PHE (F)136.81%
Isoleucine ILE (I)115.76%
Histidine HIS (H)31.57%
Lysine LYS (K)105.24%
Methionine MET (M)10.52%
Leucine LEU (L)2010.47%
Asparagine ASN (N)136.81%
Glutamine GLN (Q)52.62%
Proline PRO (P)126.28%
Serine SER (S)136.81%
Arginine ARG (R)21.05%
Threonine THR (T)94.71%
Tryptophan TRP (W)00%
Valine VAL (V)147.33%
Tyrosine TYR (Y)52.62%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC903
HydrogenH1403
NitrogenN231
OxygenO265
SulphurS4

FormulaC903H1403N231O265S4
Total Number of Atoms:2806


Total number of positively charged residues (ARG + LYS):12
Total number of negatively charged residues (ASP + GLU):14
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    7575
Absorption 0.1% (=1 g/l)    0.381,   assuming all pairs of CYS residues form cystines

Ext. coefficient    7450
Absorption 0.1% (=1 g/l)    0.375,   assuming all CYS residues are reduced
Aromaticity:0.094

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 22.87

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[32.98, 30.37, 25.13]

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:96.5968
Grand average of hydropathicity (GRAVY):0.27