Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6121
Number of amino acids:149
Molecular Weight:16494.03 Da
Theoretical pI:8.56


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)117.38%
Cysteine CYS (C)106.71%
Glutamic Acid GLU (E)42.68%
Aspartic Acid ASP (D)64.03%
Glycine GLY (G)1812.08%
Phynylalanine PHE (F)64.03%
Isoleucine ILE (I)64.03%
Histidine HIS (H)10.67%
Lysine LYS (K)64.03%
Methionine MET (M)42.68%
Leucine LEU (L)149.4%
Asparagine ASN (N)53.36%
Glutamine GLN (Q)117.38%
Proline PRO (P)85.37%
Serine SER (S)74.7%
Arginine ARG (R)85.37%
Threonine THR (T)74.7%
Tryptophan TRP (W)64.03%
Valine VAL (V)64.03%
Tyrosine TYR (Y)53.36%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC732
HydrogenH1121
NitrogenN203
OxygenO205
SulphurS14

FormulaC732H1121N203O205S14
Total Number of Atoms:2275


Total number of positively charged residues (ARG + LYS):14
Total number of negatively charged residues (ASP + GLU):10
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    41075
Absorption 0.1% (=1 g/l)    2.490,   assuming all pairs of CYS residues form cystines

Ext. coefficient    40450
Absorption 0.1% (=1 g/l)    2.452,   assuming all CYS residues are reduced
Aromaticity:0.114

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 40.70

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.86, 25.50, 22.15]

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:71.4094
Grand average of hydropathicity (GRAVY):-0.14