Physicochemical Properties of Peptide



PPepDB ID:PPepDB_2615
Number of amino acids:45
Molecular Weight:4992.8 Da
Theoretical pI:8.19


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)36.67%
Cysteine CYS (C)817.78%
Glutamic Acid GLU (E)36.67%
Aspartic Acid ASP (D)12.22%
Glycine GLY (G)48.89%
Phynylalanine PHE (F)00%
Isoleucine ILE (I)12.22%
Histidine HIS (H)00%
Lysine LYS (K)48.89%
Methionine MET (M)00%
Leucine LEU (L)24.44%
Asparagine ASN (N)12.22%
Glutamine GLN (Q)12.22%
Proline PRO (P)36.67%
Serine SER (S)48.89%
Arginine ARG (R)24.44%
Threonine THR (T)00%
Tryptophan TRP (W)24.44%
Valine VAL (V)36.67%
Tyrosine TYR (Y)36.67%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC214
HydrogenH329
NitrogenN59
OxygenO63
SulphurS8

FormulaC214H329N59O63S8
Total Number of Atoms:673


Total number of positively charged residues (ARG + LYS):6
Total number of negatively charged residues (ASP + GLU):4
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    15970
Absorption 0.1% (=1 g/l)    3.199,   assuming all pairs of CYS residues form cystines

Ext. coefficient    15470
Absorption 0.1% (=1 g/l)    3.098,   assuming all CYS residues are reduced
Aromaticity:0.111

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 26.57

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[24.44, 26.67, 17.78]

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
Grand average of hydropathicity (GRAVY):-0.24