Physicochemical Properties of Peptide



PPepDB ID:PPepDB_796
Number of amino acids:173
Molecular Weight:18195.42 Da
Theoretical pI:8.36


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)169.25%
Cysteine CYS (C)105.78%
Glutamic Acid GLU (E)10.58%
Aspartic Acid ASP (D)95.2%
Glycine GLY (G)2011.56%
Phynylalanine PHE (F)95.2%
Isoleucine ILE (I)52.89%
Histidine HIS (H)10.58%
Lysine LYS (K)31.73%
Methionine MET (M)21.16%
Leucine LEU (L)126.94%
Asparagine ASN (N)116.36%
Glutamine GLN (Q)52.89%
Proline PRO (P)126.94%
Serine SER (S)1810.4%
Arginine ARG (R)105.78%
Threonine THR (T)126.94%
Tryptophan TRP (W)31.73%
Valine VAL (V)95.2%
Tyrosine TYR (Y)52.89%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC790
HydrogenH1213
NitrogenN227
OxygenO245
SulphurS12

FormulaC790H1213N227O245S12
Total Number of Atoms:2487


Total number of positively charged residues (ARG + LYS):13
Total number of negatively charged residues (ASP + GLU):10
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    24575
Absorption 0.1% (=1 g/l)    1.351,   assuming all pairs of CYS residues form cystines

Ext. coefficient    23950
Absorption 0.1% (=1 g/l)    1.316,   assuming all CYS residues are reduced
Aromaticity:0.098

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 31.20

This indicates that the protein/peptide is stable
Secondary Structure Fraction [Helix, Turn, Sheet]:[24.86, 35.26, 17.92]

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:62.6589
Grand average of hydropathicity (GRAVY):-0.12