Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2607
Number of amino acids:48
Molecular Weight:5567.39 Da
Theoretical pI:7.72


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)12.08%
Cysteine CYS (C)816.67%
Glutamic Acid GLU (E)24.17%
Aspartic Acid ASP (D)510.42%
Glycine GLY (G)12.08%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)36.25%
Histidine HIS (H)36.25%
Lysine LYS (K)510.42%
Methionine MET (M)24.17%
Leucine LEU (L)24.17%
Asparagine ASN (N)36.25%
Glutamine GLN (Q)00%
Proline PRO (P)24.17%
Serine SER (S)48.33%
Arginine ARG (R)36.25%
Threonine THR (T)24.17%
Tryptophan TRP (W)00%
Valine VAL (V)00%
Tyrosine TYR (Y)24.17%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC225
HydrogenH363
NitrogenN71
OxygenO74
SulphurS10

FormulaC225H363N71O74S10
Total Number of Atoms:743


Total number of positively charged residues (ARG + LYS):8
Total number of negatively charged residues (ASP + GLU):7
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    3480
Absorption 0.1% (=1 g/l)    0.625,   assuming all pairs of CYS residues form cystines

Ext. coefficient    2980
Absorption 0.1% (=1 g/l)    0.535,   assuming all CYS residues are reduced
Aromaticity:0.042

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 49.72

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[14.58, 20.83, 14.58]

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:42.7083
Grand average of hydropathicity (GRAVY):-0.87