Physicochemical Properties of Peptide



PPepDB ID:PPepDB_5419
Number of amino acids:125
Molecular Weight:14421.63 Da
Theoretical pI:8.59


Amino Acid Composition:


Amino acidAmino acid countAmino acid percentage
Alanine ALA (A)75.6%
Cysteine CYS (C)21.6%
Glutamic Acid GLU (E)1411.2%
Aspartic Acid ASP (D)21.6%
Glycine GLY (G)75.6%
Phynylalanine PHE (F)64.8%
Isoleucine ILE (I)75.6%
Histidine HIS (H)32.4%
Lysine LYS (K)1411.2%
Methionine MET (M)54%
Leucine LEU (L)118.8%
Asparagine ASN (N)64.8%
Glutamine GLN (Q)97.2%
Proline PRO (P)10.8%
Serine SER (S)86.4%
Arginine ARG (R)43.2%
Threonine THR (T)86.4%
Tryptophan TRP (W)32.4%
Valine VAL (V)75.6%
Tyrosine TYR (Y)10.8%


Atomic Composition:


ElementElement's AbbreviationCount
CarbonC639
HydrogenH1023
NitrogenN175
OxygenO190
SulphurS7

FormulaC639H1023N175O190S7
Total Number of Atoms:2034


Total number of positively charged residues (ARG + LYS):18
Total number of negatively charged residues (ASP + GLU):16
Extinction Coefficient:Extinction coefficients are in units of M-1 cm-1, at 280 nm measured in water.

Ext. coefficient    18115
Absorption 0.1% (=1 g/l)    1.256,   assuming all pairs of CYS residues form cystines

Ext. coefficient    17990
Absorption 0.1% (=1 g/l)    1.247,   assuming all CYS residues are reduced
Aromaticity:0.080

Aromaticity is the calculated relative frequency of Phe+Trp+Tyr
Instability Index:The computed Instability Index (II) is : 41.63

This indicates that the protein/peptide is unstable
Secondary Structure Fraction [Helix, Turn, Sheet]:[28.00, 17.60, 29.60]

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:78
Grand average of hydropathicity (GRAVY):-0.52