Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2386
Number of amino acids:41
Molecular Weight:3981.36 Da
Theoretical pI:7.77


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)37.32%
Cysteine CYS (C)819.51%
Glutamic Acid GLU (E)12.44%
Aspartic Acid ASP (D)12.44%
Glycine GLY (G)1024.39%
Phynylalanine PHE (F)12.44%
Isoleucine ILE (I)00%
Histidine HIS (H)00%
Lysine LYS (K)12.44%
Methionine MET (M)00%
Leucine LEU (L)00%
Asparagine ASN (N)12.44%
Glutamine GLN (Q)49.76%
Proline PRO (P)12.44%
Serine SER (S)512.2%
Arginine ARG (R)24.88%
Threonine THR (T)12.44%
Tryptophan TRP (W)00%
Valine VAL (V)12.44%
Tyrosine TYR (Y)12.44%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC151
HydrogenH239
NitrogenN53
OxygenO58
SulphurS8

FormulaC151H239N53O58S8
Total Number of Atoms:509


Total number of positively charged residues (ARG + LYS):3
Total number of negatively charged residues (ASP + GLU):2
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)    0.500,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.374,   assuming all CYS residues are reduced
Aromaticity:0.049

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 45.21

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[7.32, 41.46, 9.76]

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:14.3902
Grand average of hydropathicity (GRAVY):-0.41