Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2596
Number of amino acids:48
Molecular Weight:5278.11 Da
Theoretical pI:8.76


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)36.25%
Cysteine CYS (C)816.67%
Glutamic Acid GLU (E)12.08%
Aspartic Acid ASP (D)12.08%
Glycine GLY (G)24.17%
Phynylalanine PHE (F)12.08%
Isoleucine ILE (I)12.08%
Histidine HIS (H)12.08%
Lysine LYS (K)12.08%
Methionine MET (M)00%
Leucine LEU (L)48.33%
Asparagine ASN (N)24.17%
Glutamine GLN (Q)24.17%
Proline PRO (P)48.33%
Serine SER (S)36.25%
Arginine ARG (R)510.42%
Threonine THR (T)714.58%
Tryptophan TRP (W)00%
Valine VAL (V)12.08%
Tyrosine TYR (Y)12.08%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC216
HydrogenH356
NitrogenN70
OxygenO68
SulphurS8

FormulaC216H356N70O68S8
Total Number of Atoms:718


Total number of positively charged residues (ARG + LYS):6
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)    0.377,   assuming all pairs of CYS residues form cystines

Ext. coefficient    1490
Absorption 0.1% (=1 g/l)    0.282,   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 : 48.67

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[16.67, 22.92, 16.67]

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:52.9166
Grand average of hydropathicity (GRAVY):-0.30