Physicochemical Properties of Peptide



PPepDB ID:PPepDB_715
Number of amino acids:43
Molecular Weight:5081.66 Da
Theoretical pI:9.85


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)12.33%
Cysteine CYS (C)49.3%
Glutamic Acid GLU (E)49.3%
Aspartic Acid ASP (D)24.65%
Glycine GLY (G)613.95%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)00%
Histidine HIS (H)12.33%
Lysine LYS (K)00%
Methionine MET (M)12.33%
Leucine LEU (L)12.33%
Asparagine ASN (N)00%
Glutamine GLN (Q)36.98%
Proline PRO (P)12.33%
Serine SER (S)36.98%
Arginine ARG (R)1125.58%
Threonine THR (T)12.33%
Tryptophan TRP (W)12.33%
Valine VAL (V)24.65%
Tyrosine TYR (Y)12.33%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC201
HydrogenH332
NitrogenN82
OxygenO64
SulphurS5

FormulaC201H332N82O64S5
Total Number of Atoms:684


Total number of positively charged residues (ARG + LYS):11
Total number of negatively charged residues (ASP + GLU):6
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    7240
Absorption 0.1% (=1 g/l)    1.425,   assuming all pairs of CYS residues form cystines

Ext. coefficient    6990
Absorption 0.1% (=1 g/l)    1.376,   assuming all CYS residues are reduced
Aromaticity:0.047

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 135.31

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[11.63, 23.26, 16.28]

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:24.8837
Grand average of hydropathicity (GRAVY):-1.57