Physicochemical Properties of Peptide



PPepDB ID:PPepDB_6008
Number of amino acids:121
Molecular Weight:12144.98 Da
Theoretical pI:9.27


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)2016.53%
Cysteine CYS (C)86.61%
Glutamic Acid GLU (E)21.65%
Aspartic Acid ASP (D)32.48%
Glycine GLY (G)75.79%
Phynylalanine PHE (F)21.65%
Isoleucine ILE (I)43.31%
Histidine HIS (H)00%
Lysine LYS (K)43.31%
Methionine MET (M)54.13%
Leucine LEU (L)64.96%
Asparagine ASN (N)64.96%
Glutamine GLN (Q)00%
Proline PRO (P)43.31%
Serine SER (S)2319.01%
Arginine ARG (R)86.61%
Threonine THR (T)54.13%
Tryptophan TRP (W)00%
Valine VAL (V)1310.74%
Tyrosine TYR (Y)10.83%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC502
HydrogenH849
NitrogenN155
OxygenO167
SulphurS13

FormulaC502H849N155O167S13
Total Number of Atoms:1686


Total number of positively charged residues (ARG + LYS):12
Total number of negatively charged residues (ASP + GLU):5
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    1990
Absorption 0.1% (=1 g/l)    0.164,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.123,   assuming all CYS residues are reduced
Aromaticity:0.025

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 50.62

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[21.49, 33.06, 27.27]

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:79.9174
Grand average of hydropathicity (GRAVY):0.36